Skip the auto shop - Our mechanics make house calls

Q: My car won't shift into high gear after a series of thumping while accelerating hard check engine light blinks then stops later.

asked by on

I'll be driving normally and then accelerate hard but sometimes not hard and then it won't shift gears and it will thump a lot and slow down after this it won't shift gears even if the peddle is all the way down and the check engine light will blink and the traction control light will be one. After a night of not using it or 2 nights the check engine light will turn off and it will function normally.

My car has 69000 miles.
My car has an automatic transmission.

A: Hi there. The Check Engine Light flashing i...

Hi there. The Check Engine Light flashing is an indication the engine is misfiring. Anytime the PCM (powertrain control module) recognizes misfires, the traction control is disabled (light turns on). This would account for the thumping and lack of power. With the mileage your vehicle has, it may be due or past for a tune-up. I would not worry about the transmission not shifting until the misfires are corrected. The check engine light going off, after not using the vehicle, is unusual. The PCM usually won't clear a code(s) until 50 ignition cycles without a malfunction. I recommend having the misfiring engineinspected and repaired first by a certified technician with YourMechanic.

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・Save up to 30%

Get a quote

What others are asking

Q: Steering noise, brake failure, dash lights on - 2004 Cadillac XLR

GM issued several service bulletins which appear to deal with this scenario (TSB Service Bulletin Number: 10342498 &10574399 ). Check with your Cadillac dealer.

Q: Check engine light is on after replacing battery

Manually resetting the Check Engine Light on modern vehicles requires a diagnostic scan tool. Any automotive professional can do this for you. However, battery replacement should not have caused your Check Engine Light to come on. There may be an...

Q: Opinion on buying a 2003 Accord

It's a 13-year-old car and 3800 dollars is a bit pricey, but prices in a lot of areas are different than where I am since I am in a big city. If it's in a good shape, first thing you'd...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...