1999 Cadillac SLS P0440

Tiny
CGARGIS
  • MEMBER
  • 1999 CADILLAC SLS
  • V8
  • FWD
  • AUTOMATIC
  • 113,000 MILES
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.
Wednesday, March 3rd, 2010 AT 1:32 PM

1 Reply

Tiny
FACTORYJACK
  • 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.
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Wednesday, March 3rd, 2010 AT 10:07 PM

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