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 1,000 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!
  1. Home
  2. Questions
  3. Car won't accelerate past a certain speed

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: Check engine light, the acceleration is pretty rough (lots of vibration), changed the gas cap who wouldn't click 3 weeks ago. 2011 Hyundai Accent

Hello - the first task is to pull the problem codes that are causing your Check Engine light to come on. Most auto parts stores will do this for free on a "time-available" basis, and this will guide your diagnostic...

Q: Car won't go into gear.

We would first have to know if the vehicle is an automatic or manual transmission, and the exact nature of the problem. For both transmissions, there is a wide variety of reasons as to why the vehicle would not shift...

Q: Van wont turn on

Hi there, thanks for writing in. I'd be happy to help. This suggests potentially a starter relay problem. Often times when the starter relay is faulty, this will cause the car to click as you describe when turning the key....

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 Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
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.