Skip the auto shop - Our mechanics make house calls

Q: Transmission does not shift properly

asked by on

so I was driving down the road 3 days ago, transmission slipped and lost power to the driveshaft, and rolled to a stop. it wouldn't shift into any other gear. today I jump started the truck and it would shift and drive in gear, but when it got warm it lost power to the driveshaft again. the fluid looks fresh, and is full.

My car has 227345 miles.
My car has an automatic transmission.

A: This may be a sign of a faulty transmission...

This may be a sign of a faulty transmission control solenoid. As you know, automatic transmissions use pressurized hydraulic fluid to change gears. Every time a gear change is required, the car’s computer activates a transmission solenoid, which directs transmission fluid into the valve body to engage the correct gear. When this is faulty or not working properly, this can cause a delay in gear shifting or in some cases cause the car to not shift at all. This may also be related to the various components that are controlled by the transmission control module.

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 it’s 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 vehicle. I would suggest having a professional from Your Mechanic come to your location to properly diagnose your transmission shifting problem.

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: Bad noise coming from transmission.

Depending on whether you have a manual or an automatic transmission will determine what the issue is. Also, a description of the noise would help. Most of the time if you have an issue with the manual transmission that causes...

Q: Car clicks when starting

If there is a click when you try starting it then you need to see where the click is coming from. I typically start by checking to see if the clicking is coming from the starter. If the starter is...

Q: Gauges not working and car not shifting

Hello, and thank you for writing in. There are a few sensors that can effect both of these systems. The first one you should check is the transmission output speed sensor. You may also want to check the other speed...

Related articles

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.