Skip the auto shop - Our mechanics make house calls

Q: 4l60e transmission shifting problem

asked by on

Hey so when I try to switch from 1-2 it won't shift into 2nd on its own. I have to give it higher rpm completely let off gas then slightly hit the gas then it will go into 2nd. But it's getting worse where it's barely wanting to shift into 2nd now. Also I have no 4th gear or OD. Would this be a mechanical or electrical issue. I'm hoping it's something I can fix. Thanks for reading this, appreciate your feedback.

My car has 100000 miles.
My car has an automatic transmission.

The 1-2 shift failure on the 4L60E is often due to a faulty throttle position sensor (TPS). Test the sensor (there should be a smooth, linear electrical response over the range of motion) or substitute a known good unit. A more serious cause of 1-2 shift failure on the 4L60E is a leak in the 2nd gear apply circuit (servo assembly or 1-2 accumulator). You can test for this by using an external pressure gauge. If you see a big drop in pressure when the PCM commands 2nd gear, there is a leak. It is also possible to have inadequate line pressure due to a leaking boost valve, clogged EPC filter screen, failing EPC solenoid, or possibly leaky seals throughout the transmission. The problem with the overdrive and no 4th gear is probably mechanical in nature but would require further diagnosis. Often, no 4th gear is accompanied by noise (due to hard parts failure) and/or 1st or 3rd won’t work either. The transmission you have is very common, parts are very readily available, and is easily rebuildable so you needn’t worry. If you can’t repair it on the car, just rebuild it. If you want a conclusive diagnostic performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request a transmission shift diagnostic and the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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 think I may need new engine mounts. Would that cost a lot and are the parts good quality? Also, I d

Hello. I will be happy to help you with your concerns about the mechanical condition of your 1999 Solara. Let me first answer what is by far the easiest component of your inquiry and that relates to "will the parts...

Q: Car has a hard time starting

Hello! On your particular vehicle, the hard start condition is commonly caused by a faulty fuel pump relay, fuel pump, or fuel filter, so I suggest checking the fuel pressure to determine if there is a problem with the fuel...

Q: Engine squeaks

Hi. Commonly an engine will sound as if it is squeaking due to a faulty belt or pulley. Any of the belt driven components have the possibility of producing a squeak if it becomes faulty. I suggest you have a...

Related articles

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.