Skip the auto shop - Our mechanics make house calls

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?

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
  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: Repair transmission or buy new car

Only if the value of your car after the repairs are made will exceed the cost of the repairs plus the value without the repairs being made. A 13-year old vehicle may not be worth much and depends on resale...

Q: Honda Accord 98 automatic only shift till 3rd gear, checked all solenoid already they passesd the battery test. Don’t know what el

Hi Carsav. Thanks for sending in your question tonight. Typically, when this type of problem occurs, it's due to an internal transmission issue, such as dirty transmission fluid, obstruction of debris in the hydraulic lines or an inner seal problem....

Q: Toyota EMINA, gears have failed

Hi there, thanks for writing in. To help you, I'd like to know more information about your car and the problem. Without additional information as to the condition or symptoms of the vehicle prior to it being parked it may...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...