2001 GMC Jimmy Gas and SES Light

2001 GMC JIMMY
120,700 MILES • 6 CYL • 4WD • AUTOMATIC
Avatar
CJAMMERMAN
  • MEMBER
  • 2 POSTS
My SES light is going off/on for the past year. I also cannot pump gas without the pump shutting off every 10 secs. SES is a P0442 code. Dealership smoked tank, no leaks, replaced Fuel pressure sensor. Light went off and now is back on again. I hope the pumping of gas and the SES light are related, but no one can figure out what is wrong, both the dealership and another shop. Got a new gas cap and cleaned edge of filller neck also. Can't afford Dealership to run anymore diags and replace incorrect parts, would like another opinion because everyone is stumped. All other parts tested ok, purge valve, etc. Somedays gas will pump fine, others I can barely get 5 bucks in it.
Nov 4, 2008 at 1:34 PM
Advertisement
Avatar
SWILLIAMS
  • ✓ASE Certified Mechanic
  • 597 POSTS
  • ASE Certified Mechanic
The pump problem sounds like the rollover valve is sticking. It is the ball that sits at the bottom of the tank fill line, inside the tank. The small leak could be related if the plastic is cracked where the ball sets. I would pump the tank down, drop it and see what you find. Watch out for the vent line where it runs along the frame. The lines tend to rust and it could be covering the leak. Leaks can be a bear to find.
Nov 4, 2008 at 4:52 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.