2004 GMC Yukon xl

Tiny
SAMTHMAN
  • MEMBER
  • 2004 GMC YUKON
  • V8
  • AWD
  • AUTOMATIC
I have a 2004 GMC Yukon Denali Xl, and pulled service codes p154 and p155. The description was Bank 2 Sensor 1. I changed both(upstream) and cleared the codes. I then went for a drive, and at about the 24 mile mark. The check engine light came on again. When I checked. The same codes came up. What did I do wrong?
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Friday, November 19th, 2010 AT 11:16 PM

6 Replies

Tiny
WRENCHTECH
  • EXPERT
What you did wrong was to assume that those codes meant the sensors are causing the problem. That's not necessarily the problem. The codes merely indicate a situation that the PCM has detected. Now you have to figure out what the cause was. It's not as simple as read a code and change a part as so many people believe.
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Friday, November 19th, 2010 AT 11:34 PM
Tiny
SAMTHMAN
  • MEMBER
I kinda figured that. I had my Denali since it was new and I had it serviced at the dealer up until recently. I'm no tech, but I'm pretty good with my hands. I just need some guidance. Is there anything else you need to know to help me?
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Friday, November 19th, 2010 AT 11:46 PM
Tiny
WRENCHTECH
  • EXPERT
Check all your fuses and look the harness over carefully for any breaks or burns. Those are 2 different codes both referring to the same sensor so the wiring would be highly suspect. You have both a heater code and a signal code. They are separate circuits and that has to be more than a coincidence.
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Friday, November 19th, 2010 AT 11:50 PM
Tiny
SAMTHMAN
  • MEMBER
Wow. I will give it a looksee tomorrow, and let you know. While I have your attention. My driver's side window only works when the ignition key's in the accessary position. I hooked up a snap on flash computer to run a test, and it didn't tell me anything. Do you think it's the module in the door or the door switch?
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Friday, November 19th, 2010 AT 11:56 PM
Tiny
WRENCHTECH
  • EXPERT
That's a subject for a new question. We can't address multiple problems or multiple vehicles in the same thread. It gets way too hard to follow, especially if another expert gets involved.
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Saturday, November 20th, 2010 AT 12:02 AM
Tiny
SAMTHMAN
  • MEMBER
Ok. I wil post another question about the window issue. Thanks for your advice on the 02 sensor.
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Saturday, November 20th, 2010 AT 12:14 AM

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