Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

U0109 p069e

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2 years 6 months ago #52369 by autojoe
U0109 p069e was created by autojoe
Did anyone ever get above codes without any driveability problems? Dealer replaced fpcm only problem is light on. I know usually a no start or poor running. Any ideas. 

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2 years 6 months ago #52373 by Chad
Replied by Chad on topic U0109 p069e
I would start with fuel pressure scan data.  Does actual match desired? Does scan data match mechanical gauge reading?
"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
I have learned more by being wrong, than I have by being right. :-)

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2 years 6 months ago #52375 by autojoe
Replied by autojoe on topic U0109 p069e
Thanks for the reply but the u0109 is set because of pcm does not have comm between fpcm and pcm. So not a fuel pressure issue only thing odd is no driveability problems or starting problems. Clear light comes back on. Maybe pcm is bad. Have to verify can inputs to pcm 4 wires then if good probably bad pcm. 

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2 years 6 months ago - 2 years 6 months ago #52376 by Chad
Replied by Chad on topic U0109 p069e
Hmm. I assumed that communication was present, because I believe this module needs programmed. This is a GM?  Was the dealer able to program it?
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I assumed the dealer was able to program it.  Can YOU access the FPCM with a scan tool? I wouldn't be condemning the PCM, yet. I'll check out the Network Com diagrams.
"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
I have learned more by being wrong, than I have by being right. :-)
Last edit: 2 years 6 months ago by Chad.

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2 years 6 months ago #52377 by Chad
Replied by Chad on topic U0109 p069e
What YMME?
"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
I have learned more by being wrong, than I have by being right. :-)
The following user(s) said Thank You: Noah

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2 years 6 months ago #52378 by Tyler
Replied by Tyler on topic U0109 p069e
What's the YMME? The dealer has already replaced the FPCM?

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2 years 6 months ago #52381 by autojoe
Replied by autojoe on topic U0109 p069e
Will have to test power ground and outputs from fpcm to pcm at fpcm and pcm. Just trying to help someone and never encountered a u0109 with a good running vehicle. Starts and runs fine. I will keep you posted. Thank you. 

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