1999 Cadillac SLS p0440

1999 CADILLAC SLS
113,000 MILES • V8 • FWD • AUTOMATIC
Avatar
CGARGIS
  • MEMBER
  • 2 POSTS
okay.. so im having trouble with a GM gremlin. p0440 code for the evap system.. was wondering where i should start and what to look for...
Mar 3, 2010 at 5:32 AM
Advertisement
Avatar
FACTORYJACK
  • ✓Experienced Mechanic
  • 4,159 POSTS
Initially, it could have a loose or leaking fuel cap. Could have a faulty fuel tank pressure sensor, leaking fuel sender seal, faulty vent or purge solenoid, canister, or lines. You need to at least have scan tool capabilities.
Mar 3, 2010 at 2:07 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.