Skip the auto shop - Our mechanics make house calls

Q: Engine swap

asked by on

Transmission was working fine from the beginning. But after a engine swap it won't shift into no gear at all. Mechanic said the computer for the tranny have to reset. Is that true?

My car has 200000 miles.
My car has an automatic transmission.

Changing out an engine does not normally require re-flashing any computer module on the vehicle excepting if the owner wants to possibly update the software (if there have been manufacturer updates). What has more likely than not happened is the engine and transmission were re-installed incorrectly and so, for example, the gear shift linkage is not properly adjusted.

It is even "possible" that the torque converter is not attached to the flex plate causing zero oil pressure and thus no shifting. All of the electrical connections should be checked to make sure nothing was left disconnected. If you pull the transmission oil dipstick tube, the fluid level should be at the proper level when the engine is running. If these initial checks do not reveal the issue, YourMechanic can perform a diagnostic on the shifting issue to identify the root issue.

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: 02 nissan altima. I have got the Maf and fuel pump replaced. The car starts but when I drive it after going 50mph it doesnt go up.

Claimed by Kevin Gainer

Q: Car won't start, sat for months

Hello. You are on the right track with testing the starter to see if it works. It is also possible that the battery has a bad cell in it and is not strong enough to start the car. I would...

Q: Steering to the left is fairly difficult when car is stationary.

Hi there. This is a very difficult thing to diagnose without being there to complete a steering wheel is hard to turn inspection. However, a few things you'll want to check is the power steering pump, steering rack and gear...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...