Electrical Technical Information Discussion, 97 Caddy Codes - P0404 & P0603 in Item Specific Cadillac Discussion; Here are the 2 codes from my '97caddy. I need some help explaining exactly what they mean. Thanks in Advance!
Here are the 2 codes from my '97caddy. I need some help explaining exactly what they mean. Thanks in Advance!
P0404 - Exhaust Gas Recirculation (EGR) Open Position Performance
P0603 - Control Module Long Term Memory Reset
My 97 SLS set the P0404 code when the EGR valve was sticking open. The consensus on the forum being remove and clean the EGR to correct the problem. I cleaned mine three times but the code would set each time I drove the car about five miles. I ended up replacing the EGR and that fixed the problem.
I think the P0603 code is set when battery power is lost either by way of a loose or disconnected battery terminal.