Skip the auto shop - Our mechanics make house calls

Q: Car will not shift into reverse or park.

asked by on

When I stopped car, it will only shift to neutral. I am unable to shift into reverse or park?

My car has 102377 miles.
My car has an automatic transmission.

A: Hi, thanks for writing in. Try turning the ...

Hi, thanks for writing in. Try turning the car off then shifting it to park. If that works, most likely the causes are the brake light switch or the transmission control module. From previous experience working in a Mercedes service department, those are the two most likely causes. The brake light switch can have an internal short. It is the first link in the chain, so to speak. The brake light switch not only signals the brake lights, it also tells the ABS computer you have your foot on the brake pedal and also tells the transmission control module the same thing. The transmission control module may also have and internal short. Also, there has been cases where transmission fluid migrated within the wiring harness up into the transmission control module, causing similar issues. I suggest the car be checked by a technician to verify which is the issue as replacing parts in a Mercedes can get quite costly. It's best to have a technician verify things first. Here at YourMechanic, we can have a technician come to your home or office to inspect and diagnose this issue for you, and make or suggest the necessary repairs.

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・Save up to 30%

Get a quote

What others are asking

Q: My fuel pump is internal. Must it be replaced in a shop. Cost estimate?

Hi there. Although your fuel pump might be in the fuel tank, this does not mean it must be completed in a shop with a lift. A mobile mechanic can complete this service, as long as they have the right...

Q: driving home, went to shift, clutch wouldnt move.

Hello there, a variety of common issues will cause your clutch pedal to not engage with you 1999 Ford Ranger. If the clutch pedal is not able to be pushed at all the problem is likely mechanical as hydraulic issues...

Q: Rear running and reverse lights not working

Hi there. If the left side rear lights are all operational, that rules out the fuse and switch. The problem is most likely that a connector has come loose or possibly a cut or break in a wire that is...

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...
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...