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Eric
Eric, Automotive Repair Shop Manager
Category: Cadillac
Satisfied Customers: 29970
Experience:  20+ yrs. experience as repair shop manager and technician.
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Check engine light is on

Customer Question

Check engine light is on
Submitted: 1 year ago.
Category: Cadillac
Expert:  Eric replied 1 year ago.
HI,
the check engine light only comes on when the onboard computer detects a fault in either the engine management system, transmission, or emission control system. Faults can range from vacuum leak, engine misfire, transmission problem, emission control leak, one of dozens of engine or transmission sensors, or even internal engine or transmission failure. There are over 500 fault codes that can cause the check engine light to come on. And not every one has symptoms you can feel or see or hear.
The only way to determine which of the over 500 faults is responsible is to have the onboard computer read with a diagnostic scanner. once this is done and the fault code retreived then pinpoint diagnosis can be done and repair done.
without knowing which of the over 500 faults is responsible, it is simply impossible, as well as irresponsible for anyone to guess at to which one is responsible for the check light coming on.
Unless you live in California, you can run your car by any major parts store and they will retreive the fault code and definition for you for FREE. At that point, you can decide if this is something you can repair yourself or have a professional do the repair. OR post it here for me and I can walk you thru the diagnostics and repairs
Expert:  Eric replied 1 year ago.
I noticed we have not yet resolved your concern you asked about. I would sure appreciate it if you would reply so I can offer my skills and knowledge and repair guide access to help as best I can.
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