1999 GMC Yukon V8 Four Wheel Drive Automatic 89764 miles
I have a MIL active showing a troublecode of P174. In using the online troubleshooter on my OBD II scanner it tells me either low fuel pressure or vaccum leaks. The fuel pump and filter were replaced at the onset of the MIL I have checked for vaccum leaks and don't see any, I checked with a vaccum tester. There are only two vaccum ports I can see, one for the brake booster and the other for the HVAC vent controls. Have you seen the problem before and do you have any suggestions. Thank you,
have the same problem?
Friday, May 1st, 2009 AT 5:51 PM