Skip the auto shop - Our mechanics make house calls

Q: Speed dropping suddenly while driving

asked by on

While on freeway driving at 60 mph car suddenly drops to 40 mph then picks back up
My car has an automatic transmission.

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: Lights won't turn off

This is an issue with the electronic system, which is controlled by computers such as a (BCM) body control module. The correct voltages and inputs have to be in order or issues like this can happen. The first step is...

Q: Speedometer sensor - 2002 Dodge Durango

Hi - the speedometer sensor for your Durango is electronic, and there are instrument panel sensors and wiring adjacent to the steering column. Check to be sure all connectors are re-seated, to their proper mates as well. If you would...

Q: High rpms, doesn't gain speed

Hi there. Sounds like the transmission is either slipping or the torque converter is failing. Try taking the vehicle for a test drive and manually shifting the transmission. If the engine operates normally, then the transmission valve body has an...

Related articles

What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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...
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.