Skip the auto shop - Our mechanics make house calls

Q: Acceleration problems, car shaking and check engine light on

asked by on

My car with the automatic transmission occasionally hesitates to shift when I try to give it gas and accelerate. It sounds as if it is running at high speeds even though it is only 10 mph. Inspite of my mph decelerates, the RPM is changing, increasing and decreasing. Sometimes the car runs fine. I tried to give it gas, then step on the brake to test how it works. Then it happens that the car shakes and the check engine light comes on. These problems usually occur when I press the gas hard and take off fast or when I try to accelerate from 50 mph to higher speeds.Speedometer also doesn't work correctly. It sometimes shows no speed while I am driving. What could be the problem?

Hi there. There are a few different things that can cause this. It can be the fact that the speedometer is not working due to a bad transmission speed sensor. This can cause the computer to not know when to shift the transmission. I typically start by testing and replacing this sensor.

If the issue persists, then the transmission needs to be checked. It sounds like you may have an internal transmission failure that is starting. The internal pressure need to be checked to see if there is an internal clutch failure. If you need to have the vehicle looked at, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose and repair your car’s hesitation issue.

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: replacing a cv axle simple right

Hi. Replacing the constant velocity (cv) halfshaft can be done in a few steps, but requires a few special service tools. There are also very specific torque requirements. Additionally, you can tear the axle seal if you're not careful. If...

Q: When pulling off, it feels like the rear end is dragging

If a wheel bearing in the hub was defective enough to cause drag, you would hear a tremendous amount of noise from the failed bearing. Wheels might also drag due to misalignment or failure of the brakes to retract. Misalignment...

Q: Car hesitates and jerks with rising RPM

From the description you have given, you have done a lot of replacing components and still have the problem. It appears you have covered the bases concerning the fuel system. A vacuum leak would affect the idle quality moreso than...

Related articles

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...
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.