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

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: How Does a Rain-Sensing Wiper System Work?

Rain-sensing wipers operate based on an infrared light mounted by the rear-view mirror. A light beam is reflected off the windshield at a 45-degree angle. If there is rain, snow, or something else on the windshield, less light reflects back...

Q: Win I lock it in firewall drive the front end pops like crazy on the right hand and it pull on that side to what could it be

I won't be able to know exactly what is wrong with your four wheel drive system without access to your vehicle. However, I can give some advice about how to proceed though. It certainly sounds like something has broken...

Q: 2011 Mini Cooper Countryman jerks to the left upon deceleration

Hi. We will be happy to assist you with your 2011 Mini Cooper Countryman. The issue you are describing could result from a few possible things. It may be a faulty electronic steering control module causing the jerk. The steering...

Related articles

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 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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...