2004 Cadillac CTS CHECK ENGINE IGHT

Tiny
SSIKDAR
  • MEMBER
  • 2004 CADILLAC CTS
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 12,400 MILES
Last tank I went to fuel low before fill up. Normally I keep above half tank always. Just before the low fuel signal came up - in city driving - check gas cap came up - gas cap is on - tight and all the turned beyond three clicks - CEL came on and staying on - last six days - I am only driving city about 12 mile each way most ly 25, 35, 45 mile roads taking about 30 minutes each trip - no highway trip in the last 6 days - the CEL is on - occasionally check gas cap is coming on -performance and running is same as before - I was told - it would need 40 or more drive cyles to reset - though the manual says "few trips" - short of going through the expenses at the dealership for diagnostic code read - etc. Etc. Then just do code buffer clear and reset which mayrun $100+ to $300+
-is there work around simple layman fix? Thank you. SSikdar
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Wednesday, March 10th, 2010 AT 3:13 PM

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Tiny
FACTORYJACK
  • EXPERT
If you are still getting the check gas cap message, it is still seeing a failure. The problem with testing for evap leaks, is several specific criteria have to be met for the vehicle to run it's test. I would guess that when you see the check gas cap message, it run and failed. It still could be a leaking gas cap, faulty tank pressure sensor, or system leak.
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Wednesday, March 10th, 2010 AT 3:58 PM

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