Q: Won't shift out of second gear - 2000 GMC Sierra 2500

asked by on

After I had the transmission filter replaced, the truck started developing some issue with the transmission. I couldn't shift it into overdrive but it got worse. Now, I'm not able to shift out of second gear. I still can put it to reverse though. I had the fluids checked and they are good. What might be the cause of this?

Hello. This definitely sounds like an electronic transmission control issue. It could be something as simple as a transmission range selection switch or something as serious as a transmission valve body. You may want to consult with a transmission shop or dealership to assist in this issue.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Won't shift out of second gear - 2000 GMC Sierra 2500

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: I went to get an oil change, and the mechanic noticed a leak in my transmission. This was on Saturday. They put more fluid in it.

There could be a leak on the input shaft, output shaft, oil pan, dipstick grommet, or the seal on the shifter linkage could be leaking. I recommend seeking out a professional, such as one from Your Mechanic, to help you...

Q: The transmission sometimes doesn't want to shift into overdrive .

Hi there. There are several potential reasons why the transmission on your 2002 Town & Country does not shift into overdrive. This could be caused by low transmission fluid, a blockage in the transmission lines, or a transmission sensor. The...

Q: Sludge in engine, constantly low on oil

If you are losing that much oil, and there are no external leaks (leaks that are visible outside), your vehicle may be consuming the oil. Unfortunately this can be harder to diagnose than an external leak. The valve guides and...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.