Q: Transmission problem after alternator replacement

asked by on

Hi, I had an alternator replaced 3 weeks ago. Afterwards, I noticed that the transmission couldn't shift to higher gears when driving at higher speeds. RPM was also very high. This persisted for 2 days and then went away. Just the other day, the transmission problem reoccurred while I was driving. The car then came to a stop and I was not able to get it accelerating again. I powered off the car and started it back up and was able to drive at a low speed. I've been finding similar cases online where a low battery or a bad alternator caused similar transmission problems. The explanation is that not enough voltage is being supplied to the electronic transmission control, which leads it to send out no signal or a wrong signal. This then triggers the vehicle to go into limp mode. Given the symptoms and the transmission problem coinciding with the alternator replacement, is it possible that this could be a potential cause for my transmission problem? Thanks!

My car has 113000 miles.
My car has an automatic transmission.

Hi there. Why was the alternator replaced? Was the battery tested with a digital tester that provides current voltage, cold cranking amps, and state of health? If not, I suggest having that battery tested. A bad cell inside the battery can wreak havoc on electrically controlled systems; especially computer controlled systems. This cell can create voltage spikes and dips where there should be none. I suggest having a qualified technician perform an inspection to avoid replacing unnecessary parts. Your Mechanic has several available technicians that can assist you with an electrical problems inspection.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Transmission problem after alternator replacement

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: Warning regarding throttle and limp home mode

Hello. This is the first sign of a bad throttle body. This is a common failure on this vehicle. When the throttle motor or position sensor fails this occurs as the computer can no longer control the throttle. Most of...

Q: Car won't move out of Park

The shift interlock system on your Escape prevents the shifter from being moved out of Park, unless the ignition switch is on, and the brake pedal is depressed. The brake pedal position is detected by the brake switch, which is...

Q: Car jumps when switching gears

The issue you are getting is not a common problem and the vehicle would have to be checked to see whether the problem is a broken motor or transmission mount, or if the transmission is shifting erratically. You do not...

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 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 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.