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: Can we use cruise control if our rear shaft is removed?

You should be able to use the cruise control without a problem if your driveshaft was removed. The real problem is that the front axle assembly is locked in 4 wheel drive and driving on the highway may cause a...

Q: Where is my vehicle speed sensor located?

Hi, thanks for writing in. The speed sensor on your Dodge Caravan is located down near the driver's side of the engine. This video shows a step by step process as to how to replace this. If you would...

Q: How do I reset the limp home mode?

The limp home mode helps protect your transmission if damage is detected. Limp home mode limits the transmission to only second gear, which keeps your vehicle safer, while also giving you enough power to get to a dealer. If you...

Related articles

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...
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...
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...