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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15201
Experience:  GM Grand Master Technician 2007. 14 years experience.
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2004 chev avalanche, 5.3 check engine light came on

Customer Question

2004 chev avalanche, 5.3 check engine light came on yesterday, didn't notice any difference in performance. Took it to parts store, when they plugged their reader in said it wasn't connected. went to a mechanic plugged his in said same thing. it won't give me a code and can't be reset any ideas?
JA: Does the light stay on, or does it blink?
Customer: stays on
JA: What is the model of your '04 Chevy?
Customer: 1500
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: I was hoping but seems unlikely, haven't tried anything except gas cap
JA: Anything else you think the mechanic should know?
Customer: 127,000 miles when this happened before was oxygen sensors but you tell by the performance. been a very good truck for me
Submitted: 1 year ago.
Category: Chevy
Expert:  JOHN aka Eauto replied 1 year ago.

did you check the fuses?