Why is my GMC Sierra only getting 3rd gear?
Another thing is, if you keep it in drive you’re only getting 3rd gear, but if you manually shift it into 2nd gear, it’ll go there. That makes taking off much better on the transmission. In either first or second gear, the torque converter slips more than it normally would on a takeoff.
What to do when automatic transmission won’t shift into 3rd gear?
Check the Throttle Cables. Changing the fluid solves plenty of transmission issues but if the problem of automatic transmission won’t shift into 3rd gear persists, the parts you should check are the throttle cables. A defective cable with excessive slack is likely to create issues with smooth shifting of the gears.
Are there transmission problems with a 2003 GMC Sierra?
After five years, most of the issues with these trucks had been worked out. Now, these trucks are getting older, and it’s very likely that your 2003 Sierra may be having transmission problems. Below, you’ll find a ton of troubleshooting your transmission problems.
What happens when one of the shift solenoids fails?
When any one of these two shift solenoids fail, the PCM commands the transmission to operate in LIMP IN MODE and this means that the transmission will run in 2nd gear only (no 1st and no 3rd or 4th).
Why is my transmission not shifting to third gear?
If you ignore the signs for too long, it could lead to a possible failure of the transmission. Let’s see what could be the reasons for the auto gearbox not to shift from second gear to the third. Overheating could be a reason for the gear to stick and the low fluid level is the culprit for making the transmission overheated.
What to do when 2.1-2 shift does not happen?
2. 1-2 shift does not happen at WOT (Wide Open Throttle) until you let off the gas: Best case: try replacing the TPS. Middle case: leak in the 2nd gear apply circuit (servo assembly or 1-2 accumulator). Double check by using the pressure gauge and watch for a big drop when the PCM commands 2nd gear.
Why does the gear stick in the transmission?
Overheating could be a reason for the gear to stick and the low fluid level is the culprit for making the transmission overheated. Actually, low fluid levels are the source of several transmission-related issues.
Why does my car not shift up or down?
Functional auto gearbox will shift up, down, and rest upon appropriate commands. But, when it fails to do so, there must be an internal hitch affecting the performance. If you ignore the signs for too long, it could lead to a possible failure of the transmission.
What causes a GMC Sierra to go into limp mode?
In either first or second gear, the torque converter slips more than it normally would on a takeoff. Most of the time, limp mode is caused by loss of signal to/from the TCM. Either the wiring harness has a short or the transmission fuse is blown. It doesn’t matter whether your 2003 Sierra has a 4L60E or 4L80E, the fuse will be in the same location.
What to do if your GMC Sierra has no overdrive?
AutoZone, or any other parts store will be able to help you with this for free. It really is worth noting that there doesn’t need to be a trouble code thrown for there to be a code in the computer. No 1st and No Overdrive – When the truck has no overdrive and no first gear it’s almost certainly in limp mode.
Can a GMC Sierra shift into any gear?
Answer: There is no solenoid that will prevent the transmission from going into any forward gear. Shift solenoids control shift 1-2, 2-3, 3-4 and downshifts. You need to get a scan done on the computer to see what code (s) is set.
After five years, most of the issues with these trucks had been worked out. Now, these trucks are getting older, and it’s very likely that your 2003 Sierra may be having transmission problems. Below, you’ll find a ton of troubleshooting your transmission problems.
AutoZone, or any other parts store will be able to help you with this for free. It really is worth noting that there doesn’t need to be a trouble code thrown for there to be a code in the computer. No 1st and No Overdrive – When the truck has no overdrive and no first gear it’s almost certainly in limp mode.
Why does my Chevy Silverado not shift into 2nd?
Transmission shifting is based on 3 major factors: 1- vehicle speed 2- engine vacuum 3- throttle position However there are other factors that also play into it but probably wont cause issues as bad as you are describing. It sounds like you have replaced TPS and VSS and verified those.