2004 GMC Sierra Engine Light on

2004 GMC SIERRA
62,000 MILES • V8 • 2WD • AUTOMATIC
Avatar
RAUL MOLINA
  • MEMBER
  • 1 POST
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 3:13 PM
Advertisement
Avatar
RASMATAZ
  • ✓Experienced Mechanic
  • 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 11, 2010 at 6:05 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
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.