Skip the auto shop - Our mechanics make house calls

Q: 4l80e transmission in limp mode

asked by on

I changed out same ECM and transmission from my other van that is same year and model that all worked perfect before change out, after chanhr out transmission is in limp mode, checked with scanner and there is no fault codes, thanks for any clues.

My car has 140000 miles.
My car has an automatic transmission.

Hello and thanks for your question. When changing out the transmission and ECM from another vehicle to your vehicle with the same year and model can effect many things. Check all plug to ensure that everything on the transmission is plugged in. Check the computer system to ensure all of the cables are tight and locked together. On most newer vehicles, the ignition switch is programmed with the computer system and is coded with the VIN number. In this case, you could do two things, either take the other ignition switch from the other vehicle and swap it out (only if the key has a chip), or have your computer flashed to the VIN on your vehicle. Also, try hooking up the original ECM to your vehicle, that is if the harnesses are the same and your old ECM is functional. As long as the same sensors are on the transmission as the other one, the ECM will not care what kind of transmission you have installed.

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

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: new distrbutor and module still stalls at red lights could the ecm be going bad

It certainly sounds like you are on the right track. I would recommend replacing the ECM to determine if it resolves the issue. I would also recommend checking the circuitry near this computer to be sure that no wiring problems...

Q: I ordered some keyless entry fobs and neither works. Followed the instructions exactly. I think its my car, as it has a lot props

Sometimes you need to simply hold the lock and unlock buttons at the same time for at least 7 seconds, try with the key off and with key on engine off, until the horn is heard. This will synchronize the...

Q: Strong odor of fuel, black smoke on take off, and rough running

Hey there. The rough running condition is definitely related to the black smoke and fuel smell which indicates the motor is running rich or being supplied with too much fuel. This can happen for a variety of reasons such as...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...