Having problems with your 2004 Cadillac Deville ?

Check engine soon light just came on - 2004 Cadillac Deville

Posted / edited by AnonymousUser on : 25-03-2019

Answers :

That's just a service interval reminder. Check your owners manual vs your current mileage you'll see what service is coming up.
The check engine light comes on to tell you there is a problem with a \012sensor, actuator, module, or system the computer either monitors or \012controls.

The first step is to have the computer scanned for trouble codes.

Call your local parts store they may do this for free. you can also purchase a code reader for about $50. the last option is to bring the vehicle to your local repair shop and have them run a diagnosis for a fee.

Once you know what code or codes are present post them here and I'll be happy to assist you further.
Repair Help & Product Troubleshooting for 2004 Cadillac Deville

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