Skip the auto shop - Our mechanics make house calls

Q: What sensor can cause delayed shift on a hard acceleration

asked by on

I have a rebuilt transmission with about 12,000 miles on it and a year old recently it's started to act up such as when in cruise control and hitting a hill it will do a little jerk motion then downshift from overdrive. And when going about 25 mph and putting it to the floor it downshifts to first and barely accelerates, but when put to the floor from a dead stop it has no problems except delayed shift and sometimes even hits rev limiter. This leads me to believe it's a sensor of some kind especially considering it's a fairly fresh rebuild.

My car has 12000 miles.

A: Hey there. The transmission control module ...

Hey there. The transmission control module (TCM) helps regulate fuel efficiency and power while storing information about the transmission system in its memory. A faulty transmission control module may cause a delay in acceleration or erratic shifting of gears. The transmission control module has various sensors such as vehicle speed sensors, wheel speed sensors, throttle position sensors, turbine speed sensor, and transmission fluid temperature sensors that all direct information to it in order for it to perform its function.

Other components controlled by the TCM are components such as a kick down switch, traction control system, and cruise control module. Any of these may also affect the way the transmission control module performs and controls the transmission and the shifting of your car. I would suggest having a professional from YourMechanic come to your car’s location to properly diagnose the shifting issue and advise on the correct repair.

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: Speedometer stopped working, how do I repair it? 2003 Audi A6

Hello - most likely the speedometer sensor has failed, or the wiring to it has become disconnected. Check that first. It's also possible that the speedometer sensor drive gear has failed (small plastic gear), or the instrument panel speedo gauge...

Q: Truck cranks but won't start - 1997 Chevy C1500

It sounds like you may have an intermittent electrical problem. I would recommend having all of the wiring that is in your fuel system checked to ensure that it is all in good condition. If any wiring has any damage...

Q: Car vibrating while driving

Many things can cause a vibration such as the one you are describing. Separated tires, tires out of balance, worn u-joints, broken carrier bearings, out of balance or a bent driveshaft will cause a vibration that is speed related. Some...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...