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2003 Cadillac Escalade DTC Codes; P0131, 137, 151, 157, 171

Tiny
JUSTDOITYOURSELF
  • MEMBER
  • 2003 CADILLAC ESCALADE
  • V8
  • AWD
  • AUTOMATIC
  • 129,000 MILES
I have a 03 escalade that came up with DTCs of P0131, P0137, P0151, P0157, P0171, P0174, & P0220. There is rough idling when you initially start the car and some hesitation when its in drive. Once it gets going its fine. I changed the MAF sensor and the Throttle Body assembly w/TPS attached. I still get the same symptons and codes. Could the O2 sensors be the problem here?
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Tuesday, December 29th, 2009 AT 1:28 PM

5 Replies

Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
Without having a scan tool to read fuel trims, I would suggest that you have leaking intake gaskets. These probably leak more when cold just due to contracted metal.
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Friday, January 1st, 2010 AT 12:42 PM
Tiny
JUSTDOITYOURSELF
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  • 5 POSTS
You mean the intake manifold gaskets?
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Friday, January 1st, 2010 AT 11:31 PM
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
Yes, that is correct.
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Saturday, January 2nd, 2010 AT 8:20 PM
Tiny
JUSTDOITYOURSELF
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  • 5 POSTS
Thanks for your help. Another question.I just had my fuel pressure check and its around 25 PSI, should be around 55psi. Does that pretty much mean my fuel pump is bad? And could that be related to the problems i've been having?

Thanks again
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Saturday, January 2nd, 2010 AT 8:32 PM
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
Yes It should be around 55-60, surprising it can run on 25. And yes it could be causing your symptoms.
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Saturday, January 2nd, 2010 AT 8:48 PM

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