2004 GMC Sierra Engine Light on

2004 GMC SIERRA

62,000 MILES • V8 • 2WD • AUTOMATIC

RAUL MOLINA

MEMBER
1 POST
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My engine light is on and it read two codes...P0449 and P0455. I changed the fuel cap and had the computer reset and the light went off. Later the same day the engine light went back on. I'm not sure what I should do next? PLEASE HELP ME!!

Mar 11, 2010 at 11:13 PM

RASMATAZ

CAR REPAIR CONTRIBUTOR
75,992 POSTS

P0449 Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction

P0455 Evaporative Emission Control System Leak Detected (gross leak)

Go to this link:

https://www.2carpros.com/topics/electrical/computer-test

Mar 12, 2010 at 2:05 AM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.