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

2003 CADILLAC ESCALADE
129,000 MILES • V8 • AWD • AUTOMATIC
Avatar
JUSTDOITYOURSELF
  • MEMBER
  • 5 POSTS
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??
Dec 29, 2009 at 1:28 PM
Advertisement
Avatar
FACTORYJACK
  • CERTIFIED EXPERT
  • 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.
Jan 1, 2010 at 12:42 PM
Avatar
JUSTDOITYOURSELF
  • MEMBER
  • 5 POSTS
You mean the intake manifold gaskets?
Jan 1, 2010 at 11:31 PM
Advertisement
Avatar
FACTORYJACK
  • CERTIFIED EXPERT
  • 4,159 POSTS
Yes, that is correct.
Jan 2, 2010 at 8:20 PM
Avatar
JUSTDOITYOURSELF
  • MEMBER
  • 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
Jan 2, 2010 at 8:32 PM
Avatar
FACTORYJACK
  • CERTIFIED EXPERT
  • 4,159 POSTS
Yes It should be around 55-60, surprising it can run on 25. And yes it could be causing your symptoms.
Jan 2, 2010 at 8:48 PM