Q: Check engine light spontaneously comes on

asked by on

The check engine light on the instrument panel keeps spontaneously coming on. Soon after this warning light illuminates, my car started jerking forward. This happens at various speeds; I have not noticed any pattern to the speed. I went to an independent mechanic, but he could not duplicate the problem so he couldn't repair it. In your expertise, what is causing this problem?

Hi there, thanks for writing in about your 2003 Geo Tracker. There are numerous potential causes for the problem you are having. It could be anything from a bad spark plug to a failed sensor. The only way to know for sure is to have the vehicle diagnosed while the it’s acting up and the Check Engine Light is on. This will allow for retrieval of the stored diagnostic trouble codes (DTCs). These codes serve as a starting point for any further diagnostics. If you need help, a qualified technician from YourMechanic can take a look at the car for you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Check engine light spontaneously comes on

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: Engine chugging at low speeds when the weather is bad

It is very possible that moisture is getting into the connectors of the engine control module. The connectors should be checked and cleaned if necessary. Di-electric grease can be used to help seal the connectors and keep the moisture out....

Q: I received error code P0130. What do I do next?

For this vehicle with 4.6 or 5.4 liter engine, the code P0130 could be due to a problem with the computer program calibration. There is a technical service bulletin (TSB) number 13-3-5 dated March 6th 2013. The TSB pertains to...

Q: Difficulty when changing into 2nd and 3rd gear.

Hi there. It sounds like the clutch may be sticking on the input shaft. There is also the possibility that the shift rail detents could be failing or the incorrect lubricant was installed in the transmission. An internal manual transmission...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...