Skip the auto shop - Our mechanics make house calls

Q: decelerating engine while approaching highway speed.

asked by on

When coming to highway speeqd 45 to 50 , pressing strongly on the accelerator when the transmission should be shifting into high it Wil not shift unless you let off accelerator , if you continue to press firmly on accelerator and engine deaccelerates dramatically and will not shift unless you let up on the accelerator pedal .

My car has 40000 miles.
My car has an automatic transmission.

Failure of the transmission speed sensor is a likely cause of this behavior. You have remarkably few miles for this model year! Replacing the speed sensor may be a good time to change the transmission fluid and filter as well - simply because of age and hot/cold weather cycles. A certified professional from YourMechanic can assist you with a diagnosis of the shifting problem and can replace the transmission speed sensor if this verified as the problem.

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

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: Headlights and taillights don't work

Hello. If both of these stopped working at the same time it is usually the switch. This is the most common failure on this car. I would usually check the wiring to the switch for voltage first before replacing the...

Q: How much to service an engine to a Saturn 2001SC2

Hi There, Generally, the check engine light comes on when something fairly serious is going on with the vehicle. This can happen for many different reasons such as a faulty mass air flow sensor, a faulty O2 sensor, a bad...

Q: Shifting problem?

Hi There, It sounds like your vehicle may be low on transmission fluid or the transmission may have a faulty shifting solenoid. As you know, automatic transmissions use transmission fluid to lubricate internal parts and create hydraulic pressure inside which...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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.