Check Engine Light and reduced power

Tiny
BOLOUGHLIN
  • MEMBER
  • 2008 CADILLAC ESCALADE ESV
  • 6.0L
  • V8
  • AWD
  • AUTOMATIC
  • 150,000 MILES
I have a 2008 Escalade ESV and the Engine Light is one and there seems to be a loss in power. I had diagnostics run and it pointed toward the fuel pressure which I replaced. That didn't help. One of the symptoms is when I fill the truck with gas and try to start it, it turns over but doesn't start. The next time I try to start it, it starts just fine over and over till the gas cap is opened and filled up. I have filled it with the engine running, and when the gas cap is taken off, the rpm's slightly decrease but recover while the gas cap is off. If I go that route, the engine will start just fine over and over. It seems that pressure is relieved but not recovered until the fuel pump creates the pressure. Please let me know what suggestions there might be on what to replace or try next. Thank you.
Saturday, July 18th, 2015 AT 11:35 PM

3 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
What are the exact code numbers being set?
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Sunday, July 19th, 2015 AT 3:54 PM
Tiny
BOLOUGHLIN
  • MEMBER
  • 2 POSTS
Hi. Thanks for the reply. The codes I'm receiving are:

0121
0496 - Evap System High Purge Flow Confirmed
0496 - Evap System High Purge Flow - Pending

Thanks,
Bryan
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Sunday, July 26th, 2015 AT 9:11 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
OK, the P0496 is an issue with the purge flow system, most likely a stuck open purge valve. That can have a minor effect on engine performance

The P0121 is a problem with the throttle position sensor and could have a lot of effect on engine performance.

There is a TSB for this issue that applies a special campaign to extend the warranty for this particular issue for 10 years or 120K miles because it is so common.

# 11273B: Special Coverage Adjustment - Throttle Position Sensor Replacement - (Dec 16, 2013)
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Monday, July 27th, 2015 AT 2:09 AM

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