What are the most common problems with a GMC Sierra?

Table of Contents

What are the most common problems with a GMC Sierra?

Another 258 people reported the second-biggest issue where heating and air conditioning temperature and air delivery mode door actuators may fail. If one or more delivery mode door actuators fail, the HVAC system may not produce correct temperatures or air delivery. The HVAC system stores fault codes, which help with diagnosis.

What causes a bad throttle body to not start?

Airflow Disruptions from Vacuum Leaks or Throttle Stop Vacuum leaks can disrupt the air-fuel flow because of an imbalanced airflow, which can cause throttle body pressure problems. The issue could also be an incorrectly adjusted throttle stop.

How to do throttle body re-Learn Chevy Malibu?

1) Start the engine and let it idle in park for 3 minutes. During that period the idle may be higher idle than normal. 2) After 3 minutes, turn the engine off and leave it off for 60- seconds. 3) Start the engine again and let it idle in park for 3 minutes one more time. During these run periods you may see a check engine light.

Are there any recalls on the GMC Sierra 1500?

There are four recalls currently active on the 2020 Sierra 1500 pickup truck. According to NHTSA Recall #20V116000, the bolts used to secure the front and/or rear brake calipers may not have been properly heat treated. These bolts may break under load, reducing brake performance or interfering with proper wheel rotation.

Why does my GMC Sierra 1500 not start?

Happened before, I gave it air, it started, thought bad filters, then noticed no umph in acceleration, leads me fuel line or bad plugs, not burning fuel. Checked carb, It’s not wet this time, leads me to fuel.

When did the GMC Sierra have the most problems?

The model years with the most problems reported were 2004 and 2007, with more than 60 complaints each year, followed by 2002, 2003, 2005, and 2010, with more than 40 each year. Of the 112 problems, five different complaints have been reported 90 or more times.

Do you need to clean the throttle plate on a GM pickup?

Cleaning the throttle plate and throttle plate bore on the 4.8L, 5.3L, and 6.0L GM electronic throttle body is one of the most important routine maintenance services that should to be done on your GM pickup or SUV. Why?

How to do throttle body Relearn on a Silverado?

If you look up “throttle body relearn” for your make and model you should find the process for your vehicle. Mine was basically turn the key on, turn the key off 5 seconds, turn the key on for 5 seconds, turn the key off for 15 seconds, turn it on for 15 seconds, turn it off and start the truck.

How to troubleshoot a GM 4.8L 5.3L?

You can find this tutorial in Spanish here: Cómo Diagnosticar y Resolver Una Falla en Cilindro (GM 4.8L, 5.3L, 6.0L) (at: autotecnico-online.com ). The core symptom of a misfire is rough idle. This isn’t the only symptom that your GM van, pickup or SUV might experience… here are some more that you might see:

What makes a GM 4.8l engine misfire?

Now that we’re aware of the core essentials that each engine cylinder needs to run at a 100% power output.. in the next sections I’ll explore some of the specific components that fail and cause a misfire and misfire codes.

What kind of problems does a 4.8L Vortec have?

Chevy 4.8L Vortec Engine Problems 1 Faulty intake knock sensor 2 Water pump failure 3 Fuel pump failure 4 Intake manifold and gasket air leaks

You can find this tutorial in Spanish here: Cómo Diagnosticar y Resolver Una Falla en Cilindro (GM 4.8L, 5.3L, 6.0L) (at: autotecnico-online.com ). The core symptom of a misfire is rough idle. This isn’t the only symptom that your GM van, pickup or SUV might experience… here are some more that you might see:

Is there an engine misfire code on a GM 4.8L?

Engine Misfire or Rough Engine Idle on GM 4.8L, 5.3L, 6.0L is becoming; more common and getting harder to diagnose. Because, GM V8 engines are very prone to a rough idle and engine misfire when cold. The check engine light may also come on, with codes P0300, P0171 and PO174.

What should the fuel pressure be on a Chevy Silverado?

If you want to save some bucks on this purchase take a look at my recommendations here: Where To Buy A Fuel Pressure Test Gauge. FUEL PRESSURE SPECIFICATION: The fuel pressure specification for the 1999-2006 4.8L, 5.3L, 6.0L Chevrolet Silverado (Suburban, Tahoe) and GMC Sierra (Yukon, Yukon XL) is 55 to 62 PSI. Flex fuel engines: 48-54 PSI.

Are there any changes to the GMC Sierra 1500?

New distributor comes with new ESC electronic unit, pickup coil, cap & rotor, also. No change. Next, read somewhere that the fuel pressure regulator diaphram if split could cause flooding. rebuilt throttle body unit, rebushed it and boiled it out and added rebuild kit and brand new Borg Warner injectors.

When did the GMC Sierra truck come out?

The GMC Sierra is the fifth-most popular truck in the United States, with more than 230,000 trucks sold in 2019. General Motors introduced the GMC Sierra and its twin, the Chevrolet Silverado, in 1998.

What’s the average age of a GMC Sierra?

Most affected are model years 1999 to 2009, 2012 to 2015, and 2017. The problem develops on average around 81,128 miles, and estimates for diagnosis range between $88 and $111. 90 owners also reported that the speedometer or other gauges in the instrument panel might start to work erratically.

Why does my GMC diesel engine not work?

American diesel fuel is thinner than its European counterpart, allowing for air pockets that cause the metal to rub against metal and create shavings. “The pump secretly deposits metal shavings and debris throughout the fuel injection system and the engine until it suddenly and catastrophically fails without warning,” the lawsuit alleges.

Is the GMC Duramax compatible with diesel fuel?

The Detroit News reports that GM is now facing a class-action suit alleging its 6.6-liter Duramax engine found in 2011-2016 Chevrolet and GMC models is not compatible with US diesel fuel.

What’s the average number of miles on a GMC Sierra?

The issue appears on average around 147,713 miles. The diagnosis of the problem runs between $88 and $111. Another 258 people reported the second-biggest issue where heating and air conditioning temperature and air delivery mode door actuators may fail.

American diesel fuel is thinner than its European counterpart, allowing for air pockets that cause the metal to rub against metal and create shavings. “The pump secretly deposits metal shavings and debris throughout the fuel injection system and the engine until it suddenly and catastrophically fails without warning,” the lawsuit alleges.

The Detroit News reports that GM is now facing a class-action suit alleging its 6.6-liter Duramax engine found in 2011-2016 Chevrolet and GMC models is not compatible with US diesel fuel.

What causes a Duramax diesel engine to heat up?

When the engine is working hard, the turbocharger is drawing in a ton of air, and the restrictive stock turbo inlet tube can effectively choke the VGT turbocharger causing the compressor outlet temperature to skyrocket, heating up the intercooler, and ultimately raising the temperature of combustion and the coolant temp.

How is General Motors dealing with the diesel scandal?

While the ramifications of the Volkswagen Dieselgate scandal continue to be felt, it seemed like the dark fog over diesel technology was finally lifting. But now General Motors is dealing with its own situation regarding diesel engines.

When to know if your GMC Sierra fuel pump is bad?

If your car isn’t starting at all, and you hear the fuel pump prime that is usually a good indication that the pump is working to some capacity. Testing your Sierra’s fuel pressure on each side of the pump would be the best way to diagnose this problem.

What are the features of a 1994 GMC Sierra 1500?

This 1994 GMC Sierra 1500 Club Cpe 4WD features a Black Onyx Exterior with a Gray Cloth Interior and has only 197,051 miles. TECHNOLOGY FEATURES: This GMC Sierra 1500 Includes AM/FM Stereo, Digital Clock, Cassette Player Here at R & B Car Com…

What does the PCV do on a GMC Sierra?

⫷ Circus Circus Splash Zone. Water Slides, Fun Zone, and Swimming Pool. Cheap Family Fun in Vegas ⫸ An error occurred while retrieving sharing information. Please try again later. What does a PCV do?

Are there any problems with the GMC Sierra 1500?

Check out our GMC Sierra 1500 overview to see the most problematic years, worst problems and most recently reported complaints with the Sierra 1500.

How often does the GMC Sierra come out?

Their four generations have appeared every five to seven years: 1999 to 2007, 2007 to 2014, 2014 to 2019, and 2019 to the present. Here’s a look at some of the most common problems the GMC Sierra has had over the years.

How much does it cost to fix a GMC Sierra 1500?

1 Hesitation, Surging 2018 Sierra 1500 Average Cost to Fix: N/A Average Mileage: 0 mi 2 Hard Shifts 2018 Sierra 1500 Average Cost to Fix: N/A Average Mileage: 0 mi 3 A/C Not Working 2018 Sierra 1500

Why does my GMC Sierra turn to high heat?

With the A/C on, the drivers side turns to high heat at intermittent times. When the mileage was low, I’d find a pot hole or large lane marker and the little jolt would turn off the heat. Now we are at full stop, shut it off, remove the key and restart.

What are the symptoms of a bad alternator in a GMC Sierra?

Here are the most common symptoms of a bad alternator in a GMC Sierra: The battery light is designed to tell you that there is not enough voltage to properly charge the battery, or that the battery itself is not holding the proper voltage. In rare occasions the service engine soon light may light up.

Why is my GMC Sierra Classic not working?

Radio Not Working: I Have a 2007 Gmc Sierra Classic Crew Cab. I I have a 2007 gmc sierra classic crew cab. I started having problems with my radio this week so I decided to change out the head unit. Put a new one that is recommended for my truck and same thing is happening.

How much does a GMC Sierra 2500HD cost?

Includes $450 in cash and discounts. Includes $450 in cash and discounts. Includes $950 in cash and discounts. Includes $950 in cash and discounts. Includes $950 in cash and discounts. Includes $1,450 in cash and discounts.

What kind of radio does a 2007 GMC Sierra have?

I have a 2007 gmc sierra classic crew cab. I started having problems with my radio this week so I decided to change out the head unit. Put a new one that is recommended for my truck and same thing is happening.

Is the 4WD computer on my 1992 GMC Sierra bad?

This sounds like either the 4wd computer is bad, or the actuator on the transfer case went. You would need to have the 4wd computer scanned for codes. I have a 1992 GMC Sierra 4×4 that won’t go into 4×4. There seems to be no power going to the front axel actuator. The actuator does work, tested ok. How can I test the switch on the transfer case?

Why is the heater on my GMC Sierra not working?

Have a 2000 gmc sierra. Heater not blowing out hot air. Both input and output hoses hot. Can air . On hot it is just blowing lukewarm air . Putting hotter. Temp gauge is registering just below 210 Could be 2 things, one would be a bad temperature valve, a plugged heater core, or a blend door actuator.

Why does my Chevy 2500 not have 4 wheel drive?

Front axle is not engaging 4 wheel drive, replaced actuator and can hear it working but still no 4 wheel drive For what it’s worth my 2000 chevy 2500 wouldn’t go into 4 high .

Where was the 2000 GMC Sierra 1500 last serviced?

1st owner drove an estimated 11,834 miles/year • 2nd owner drove an estimated 5,447 miles/year • 3rd owner drove an estimated 0 miles/year • 4th owner drove an estimated 0 miles/year. Last serviced at 107,068 miles in Martinez, GA on 10/30/16 • Vehicle serviced. Mileage: 137,000 miles Body Type: Pickup Color: Gold Engine: 8 Cyl 5.3 L

Can a Chevy truck not drive in 2WD?

In summary, it is possible to have a condition where the truck will not engage/move in 2WD but it would in “4WD” and “Auto 4WD”. It will drive the rear wheels in “Auto 4WD”.

Why does my GMC Sierra 1500 not shift gears?

GMC Sierra 1500 Questions – Speedometer doesn’t work and transmission doesn’t shift gears. – CarGurus Speedometer doesn’t work and transmission doesn’t shift gears. The speedometer stays at 0 all the time. When the transmission is in drive it won’t come out of 1st gear.

Why does my speedometer not work on my GMC Sierra 1500?

– CarGurus Speedometer doesn’t work and transmission doesn’t shift gears. The speedometer stays at 0 all the time. When the transmission is in drive it won’t come out of 1st gear. Reverse works fine, and if I manually put the transmission in 1st or 2nd it works fine.

Is there a problem with my GMC Sierra 4×4?

If it was 4Lo, then the problem is not in the front diff. – the diff. doesn’t have two speeds. Once you figure it out and do the repair, make sure you take it offroad and put it through the paces to make sure there was no damage. You don’t want to find out when you really need 4×4 and it’s not available.

Where does the GMC Sierra 1500 AT4 go?

This quadrennial event challenges teams to drive through Canada, Alaska and into the Arctic Circle. With temperatures well below freezing, see how these three used their Sierra 1500 AT4 to witness beautiful backdrops and experience some of the most isolated regions of North America.

What kind of engine does GMC Sierra 1500 have?

Read the vehicle’s owner’s manual for more important feature limitations and information. Sierra’s 9,200-lb rating requires a properly equipped AT4 Crew Cab Short Bed 4WD model with 5.3L V8 engine. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner’s Manual.

Why is my GMC Sierra 1500 not starting?

If a new car battery has been installed, the battery may not have yet reached its full capacity. There is nothing to worry about. A new battery only develops its full capacity over time. The voltage of the battery on your GMC Sierra 1500 can be measured precisely with a multimeter.

Most affected are model years 1999 to 2009, 2012 to 2015, and 2017. The problem develops on average around 81,128 miles, and estimates for diagnosis range between $88 and $111. 90 owners also reported that the speedometer or other gauges in the instrument panel might start to work erratically.

The GMC Sierra is the fifth-most popular truck in the United States, with more than 230,000 trucks sold in 2019. General Motors introduced the GMC Sierra and its twin, the Chevrolet Silverado, in 1998.

Is the GMC Sierra 1500 going to be new?

2021 could mean a new truck new you, but that’s not the case for the 2021 GMC Sierra 1500. The GMC Sierra has hardly any changes for the new model year, meaning it still has the same disappointments from 2020. What’s new for the 2021 GMC Sierra 1500?

What kind of tailgate does GMC Sierra have?

For example, the Multi-Pro tailgate that has been available on the Sierra is now available with the Silverado as the multi-flex tailgate. However, according to AutoBlog, the 2021 GMC Sierra Denali is an exception here. It has a GMC exclusive adaptable ride suspension that noticeably improves the ride and handling.

What are the problems with the GMC Sierra?

With the 2021 GMC Sierra, customers are provided a little bit of luxury with the hard-working capability of a pickup. The automaker claims “command meets comfort” with this model, but customers aren’t impressed. This GMC appears to struggle with the steering, seats, engine and powertrain, leaving owners confused about what they have paid more for.

What’s the diagnostic code for a GMC Sierra?

GM service technicians may also find a diagnostic trouble code (DTC) of P11D5 when trying to assess the problem with the vehicle. The hazards: this problem does not pose a safety risk to the driver or vehicle occupants.

The issue appears on average around 147,713 miles. The diagnosis of the problem runs between $88 and $111. Another 258 people reported the second-biggest issue where heating and air conditioning temperature and air delivery mode door actuators may fail.

Is there a recall on the GMC Yukon?

The recall covers the Chevrolet Silverado and GMC Sierra 1500, 2500 and 3500 pickups from the 2014 through 2018 model years. Also included are the Cadillac Escalade from 2015 to 2017, and the GMC Yukon and Chevy Suburban and Tahoe from 2015 through 2018.

Why does my Chevy Silverado not go into 4WD?

Wire brushed it down and nothing changed. My 4wd would blink but not engage. It would engage into lower gear in 4lo but wouldn’t actually go into 4wd. Taking a closer look at the wires, I noticed that there is a small ground wire that was hidden in the tube that got unconnected. Simply put a new connector on it and works like a charm now!

Wire brushed it down and nothing changed. My 4wd would blink but not engage. It would engage into lower gear in 4lo but wouldn’t actually go into 4wd. Taking a closer look at the wires, I noticed that there is a small ground wire that was hidden in the tube that got unconnected. Simply put a new connector on it and works like a charm now!

Why are my GMC air conditioners not working?

The claims center on what are reported to be bad welds in the original condenser units. The problems are worsened by what many owners report are GM’s acknowledged 10-12 week delays in the supply chain, such that many owners have been forced to wait two to three months for the repairs to be made.

Is there a recall on the GM air conditioner?

While GM has reportedly recalled all of its previous faulty inventory stock of the affected parts, no vehicle recall has been issued for those drivers stuck with failing GM air conditioning.

Why does my GMC Sierra AC not work?

While there are a variety of reasons your GMC Sierra 2500 HD air conditioning won’t work, the most common 3 are a refrigerant leak, an electrical climate control issue, or a problem with the air conditioning compressor. What will be the outcome of an air conditioning system diagnosis?

Why is my GMC Sierra 2500 HD not working?

Learn if it’s a simple fix or time to seek out a trusted technician. Not your vehicle? Why Isn’t My A/C Working? What are common reasons my GMC Sierra 2500 HD has air conditioning problems?

Why is the a / C on my 1992 Chevy not working?

Have a competent A/C tech check your freon charge, my money is on it being low. Re: 1992 AC Problems-Blinking A/C and not working.. A/C blinks and won’t work. If the battery is disconnected it will work again but it will go into the not working mode sooner or later.

When do you Know Your GMC Sierra ignition switch is bad?

If your GMC Sierra is starting right up, but then immediately dies, that is a very good indication that the ignition switch is bad. Here’s what happens. You aren’t getting power to the ignition or fuel pump while the key “rests” in the run position.

How to troubleshoot a no start GM 4.3L?

How To Troubleshoot A No Start (GM 4.3L, 5.0L, 5.7L). CASE 2: The multimeter DID NOT register the ON/OFF voltage signal as you turned the engine with the ratchet. This test result usually confirms that the crankshaft position sensor is bad and needs to be replaced.

How does the crank sensor work on a GMC 4.3L?

Below, in a nutshell, is how the crankshaft position sensor works in your 4.3L, 5.0L, and 5.7L Chevrolet or GMC (or Olds, Cadillac) Pick Up or SUV: When you turn the key and start cranking the engine the crank sensor gets 12 Volts on Circuit A and Ground on Circuit B.

If your GMC Sierra is starting right up, but then immediately dies, that is a very good indication that the ignition switch is bad. Here’s what happens. You aren’t getting power to the ignition or fuel pump while the key “rests” in the run position.

Are there any issues with my GMC Silverado?

Another common issue with 2007-2013 Silverados and Sierras is that the fuel level sensor stops working. After approximately 120,000 miles, the fuel gauge may start misreading the fuel level or working inconsistently. You might find it always reads empty even right after you fill up the gas tank. It might also jump between full and empty.

What are the most common GMC truck problems?

One of the most common 2007-2013 GMC and Chevy truck problems owners experience is excessive oil consumption. This problem led vehicle buyers to launch a class-action lawsuit against GM, which alleged 2010-2013 vehicles with Generation IV 5.3 Liter V8 Vortec 5300 engines were defective.

What are the symptoms of a bad ignition switch?

We’ve compiled some of the most common symptoms of a bad ignition switch . These include stalling issues, not starting, and no power to the radio or accessories. The Sierra’s ignition switch is not what your key goes into.

Why does my GMC Sierra 1500 not work?

While there are a variety of reasons your GMC Sierra 1500 air conditioning won’t work, the most common 3 are a refrigerant leak, an electrical climate control issue, or a problem with the air conditioning compressor. What will be the outcome of an air conditioning system diagnosis?

Is there a problem with my Chevy Silverado?

My 2000 chevy started this problem 2 days ago. It will idle and drive just fine, but will simply shut down. The low fuel light will come on for a split second and then the battery light comes on. It willl crank like it’s not getting fuel.

What kind of starter does a GMC Sierra use?

Drove home, 78 miles worth, ran like a champ, no issues. 5.7; TBI 350; 2WD ;A/T; w/AC. Any suggestions? 38 people found this helpful. What about the starter. You would think, if it was the starter, it wouldn’t start after many attempts. It did and then ran perfectly. Need more solutions 35 people found this helpful. Your starter should be good.

What are the parts of a GMC Sierra 2500?

Front Replacement Control Arm Ball Joint Tie Rod and Sway Bar Link Kit – for 2003 GMC Sierra 2500 HD 8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated – SLE Cab & Chassis 4-Door 8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated Loading Reviews… Quality: Premium – High quality new replacement part. Loading Reviews… Loading Reviews…

Where to buy parts for a 2003 GMC Sierra?

If you are consulting your 2003 GMC Sierra 2500 HD parts diagram or searching high and low for GMC Sierra HD accessories, you may want to consider an online auto parts retailer like PartsGeek.com.

Is the GMC Sierra SLT a heavy duty vehicle?

Available on 2021 base Sierra HD. Standard on SLE, SLT, AT4 and Denali 2021 trims. Read the vehicle’s Owner’s Manual for important feature limitations and information. Excludes other GM vehicles. Requires available accessory trailer camera and installation. Not compatible with all trailers.

When do I set the code p0370?

In the codes outlined in this article, the “A” indicates the problem is with a portion of the system circuit, instead of a particular symptom or component. A code P0370 is set when the PCM detects a malfunction with the “A” engine position sensor signal. Related timing reference signal A trouble codes include:

What does the code P0300 on a GMC Sierra mean?

P0300 is certainly a cause for concern, and can be a threat to the drivability the GMC Sierra. It will often be accompanied by codes P0301-P0308. These particular codes also indicate that there is a misfire detected, but they specify the specific cylinder.

What are the symptoms of a GMC Sierra OBDII code?

Sierra P0300 OBDII Code Symptoms 1 The P0300 GMC trouble code will trigger the Sierra’s service engine soon light. 2 The vehicle itself may begin to run rough. It depends on how serious the misfire is. 3 The vehicle may produce excess vibration, espescially at lower RPM

How does the p0370 high resolution signal work?

P0370 Description. The optical sensor provides a high resolution signal to the Powertrain Control Module (PCM) by counting pulses on the sensor disk located in the injection pump. The high resolution is one of the most important inputs by the PCM for fuel control and timing.

Is the GMC Sierra AT4 an off road truck?

A high, confident stance and bold grille finished in black chrome add sophistication to Sierra AT4’s capable off-road ability. Designed for your active lifestyle with exclusive darkened trim and decor, leather appointment and smart storage.

How to find a GMC dealer in your area?

You are currently viewing GMC.com (United States). Close this window to stay here or choose another country to see vehicles and services specific to your location. The Manufacturer’s Suggested Retail Price excludes destination freight charge, tax, title, license, dealer fees and optional equipment. See your GMC dealer for details.

What kind of engine does a GMC 3500 have?

Requires properly equipped 3500 Regular Cab DRW Long Box 2WD model with available 6.6L Duramax Turbo Diesel engine and gooseneck hitch. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner’s Manual. The weight of passengers, cargo and options or accessories may reduce the amount you can tow.

Why is my Chevy Silverado not 4 wheel drive?

Over time, dirt, moisture and corrosion can affect the contacts on the bolts used to attach the wires to the frame. If you have a 2008 Chevy Silverado with 4-wheel drive problems, or a similar GMC or Chevy truck from another model year, replacing the switch will solve the issue.

Why does my GMC pickup truck use so much oil?

The AFM system, which disables some of the engine’s cylinders at lower RPMs to reduce fuel use, is the most common cause of this issue. While the system accomplishes this, it also leads to oil use problems. Some drivers have reported using as much as a quart of oil every 1,000 miles.

How do I reset Transmission Control Module Chevy Silverado?

I have a 2001 Silverado. To reset my TCM I turn on the key to the on position press the gas pedal to the floor for 10 seconds and then turn the key off then release the gas pedal and wait about 5 minutes to restart the engine. I have a 1999 Chevy 1500 I rebuilt the transmission so when I put it in drive its like it take off in high gear.

What to do if your GM pick up has no start?

One of the most overlooked areas, when testing a hard to diagnose no-start, is the mechanical condition of your 4.3L, 5.0L, 5.7L GM pick up, van or SUV. Checking the engine mechanical condition means an engine compression test.

When to reset the computer in a 2005 GMC?

If a warning or service light illuminates on the instrument panel in your ’05 GMC, have the vehicle looked at and serviced by a qualified mechanic. After the vehicle has been repaired, you or your mechanic must reset the computer so that the light (s) on the instrument panel will shut off.

Why are my fuel gauges not working on my Chevy Silverado?

In fact, this is,unfortunately, a common problem among most GM vehicles built from 2003-2006 – various gauges in the instrument clusters of these cars and trucks tend to fail as the mileage starts to get into the “high” zone. This problem is caused by defective drive motors that were used on the circuit boards of these instrument clusters.

Why does my 4 wheel drive not engage?

The transfer case could pose another reason why your 4 wheel drive fails to engage. This could be due to the vehicle not coming to a complete stop to allow it to engage. This is because the splined pin and gears of the actuator need to align 100% with the gears inside the transfer case.

What does the blinking 4 wheel drive indicator mean?

So what is that 4 wheel drive indicator blinking on your dashboard means? The purpose of the 4 wheel drive light is to indicate when you have engaged 4WD mode by selecting 4H. When the light flashes continuously for more than 30 seconds it signifies there is a problem somewhere on your drivetrain system and that 4WD has not engaged properly.

Why is my Chevy truck not shifting into 4 wheel high?

Cycle the ignition switch from “RUN” to “OFF” five times to clear diagnostic trouble code 1 from the TCCM. Important: The codes will not clear if the 20-amp T-casefuse is not removed for at least 30 seconds.

Is there a problem with my Chevy truck?

With transfer case in 2WD the truck will not engage and will not move, and with 2 failures in 2WD there is clearly something wrong. I really need help in identifying the problem.

Another 258 people reported the second-biggest issue where heating and air conditioning temperature and air delivery mode door actuators may fail. If one or more delivery mode door actuators fail, the HVAC system may not produce correct temperatures or air delivery. The HVAC system stores fault codes, which help with diagnosis.

When did I change the fuel pump on my GMC Sierra?

I changed the fuel pump on my 1996 GMC Sierra earlier in the year. I cut through my truck bed right above the fuel pump so I would have easier access to it. For the most part my truck has been fine but I have had problems with the ground wire coming from the fuel pump. At first I thought it was just the old rusty bolt that grounds the fuel pump