Skip the auto shop - Our mechanics make house calls

Q: Car won't accelerate past a certain speed

asked by on

When my car hits a certain speed, I can't accelerate, or I begin to lose speed. The car may also shake/jerk at a full stop while my foot is on the brake. These issues happen frequently, but inconsistently.

You may be having a problem with the A pilar; the sunroof drain could be leaking water into some electrical connections in the driver’s side kick panel. The connections for the throttle position pedal sensor are there, which may have taken-on water, causing corrosion, which could be making the sensor give incorrect, erratic readings. I would recommend you have a mechanic, like one from YourMechanic, come and check it for you to see if this is your problem. An engine scan would indicate problems in the system, and would be the best place to find a path to repair.

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

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: Problem accelerating

Hello, thank you for writing in. When you hear, feel, or notice any type of issues with the vehicle it should never be ignored. The vehicle may just need some basic maintenance. Consider the last time you had the following...

Q: 2006 pontiac grand prix told front wheel bearings loose

Your vehicle has sealed axle bearings that if they are loose can cause damage to the brake rotors and brake pads along with possible damage to the brake calipers and brackets. Also the ABS speed sensors may get damaged and...

Q: Why is my auto transmission down shifting to the wrong gear when decelerating?

Improper shifting, either up or down, can be caused by a few different issues. If the transmission fluid condition or level are not correct, this can cause erratic shifting. Servicing the transmission may resolve the issue. Other causes can be...

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...
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.