Q: Car shifts if I drive at a slow rate of speed. Won't if I drive a little faster. Speedo works, transmission issue or speed sensor?

asked by on

The car shifts easier when driving slow, once I drive normal it has a harder time shifting if it does at all, I've herd of its a bad sensor the speedometer would flicker or not work but my speedo works just fine. Check engine light popped up I got a code read for PO715 (turbine shaft speed sensor) some tell me to replace speed sensor others say to replace transmission. I need help finding out which step to take. Only reason I assume it may not be speed sensor is because everyone is telling me the speedometer wouldn't work if that was the case. Is it still possible if the issue is the sensor even though my speedometer works correctly?

My car has 186000 miles.
My car has an automatic transmission.

There is a technical bulletin from the manufacturer to replace the powertrain control module and then re-testing the vehicle to see if the problem continues. If it does then try and flush out the transmission and if the problem still continues then replace the transmission. The bulletin seems to suggest taking a trial and error approach to find which part of the transmission is failing. The transmission is most likely slipping internally and this is the reason for the code. If you need assistance with this, a certified technician from YourMechanic can come to your home or office to diagnose you gear shifting issue.

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. Car shifts if I drive at a slow rate of speed. Won't if I drive a little faster. Speedo works, transmission issue or speed sensor?

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: What are the red and orange lights that show on the dash?

Your car has a number of important dash lights that are used to inform you of potential problems and to deliver other information. These include the following: Seat Belt Reminder Indicator: This light will illuminate if an occupant has...

Q: I want to install tachometer what do I hook to in the ignition switch?

Hi there. Take the power wire to the tachometer (the input wire) and hook it into the return wire on the coil system. This will register the tachometer and make it work. Put the ground wire on a good source...

Q: Check engine light and P1345 code

I'm thinking that they may have sold you a V6 distributor. Remove the rotor and look at the top of the vane cup for a "6" or an "8". It there is a 6, it's a V6 distributor and won't...

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...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.