2022 L5P Reduced Power - P0700 and P175E

paint94979

Beer Nazi
Sep 18, 2006
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Left a job site, got home and when I restarted the truck reduced engine power came on and now the truck won't shift past 3rd gear and it clunks when I put it into gear... Tried clearing codes with EFI Live and nothing. What could it be?
 

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
23,033
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Phoenix Az
Well…. P0175E isnt a code lol. Its either P175E or P0175. Since P0175 is a rich code, im betting its P175E
 

N2BRK

Well-known member
Dec 31, 2009
2,377
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Gettin’ rowdy here today ?
 

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Hambone

Always learning
Jan 24, 2016
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Florida
The clunk might just be it jumping straight to 3rd gear. Both those codes are just signals that something is amiss. Have you tried clearing them and driving to monitor input/output speed yet to see if you got some slippage?
 

paint94979

Beer Nazi
Sep 18, 2006
11,742
33
48
39
The clunk might just be it jumping straight to 3rd gear. Both those codes are just signals that something is amiss. Have you tried clearing them and driving to monitor input/output speed yet to see if you got some slippage?
Yep the clunk is the transmission shifting into 3rd or 5th, whatever these trucks default to... I have tried clearing the codes with my V2 and they do not clear at all, they stay on.
 

Hambone

Always learning
Jan 24, 2016
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Florida
Do you have access to a stronger scanner?
To me it sounds like a stupid simple fix thats masquerading as something worse.
Is the truck stock or tuned?
 

2004LB7

Super Moderator
Staff member
Dec 15, 2010
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Norcal
There's also P0652 and C116, I changed the rear brakes, pads and rotors and this stuff popped, everything is connected, need to investigate. Not sure if they're related
P0652 is a 5 volt circuit. So any other items on that circuit dropping out can cause all sorts of problems. Might want to look into this. Supposedly the 5v reference for the AC sensor. But may power other sensors too
 

Hambone

Always learning
Jan 24, 2016
591
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Florida
Its Nick -- "stock" is a four-letter word to him. :LOL:
Lol!
I will say electrical gremlins are the absolute worst! I had one earlier this year that was literally just a dead cell in 1 of the batteries causing a whole laundry list of things... always start at the source!
I also was enlightened to the fact that Chat gpt / grok are great for wiring diagrams... good luck Nick! Keep us posted ?