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Code P2178

5K views 4 replies 5 participants last post by  johnwickman 
#1 ·
Hello SF friends,

I just received a code P2178, which is stating Lean on Bank 2.

I have read through the forum and it seems some people have had this code but not too much in narrowing down the issue.

Some are saying the MAF needs replacing, or oxygen sensors, either up stream or down down stream, and even a crack in the IC.

I'm looking for some help from you fine people to narrow down a possible solution/fix.

2007 GXP
2.0
turbo stock
GMPP update
130k miles

I'm not getting the limp mode occurring. The engine seems to be running fine. The only noticeable difference, even before the code, was a tiny bit of idle surging, but very slight.

Any ideas what I should look for, troubleshoot?

Thanks everyone!
 
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#3 ·
Do you have a CAI? If so, which one? Chances are you will need to replace your MAF....the problem therein lies after that. You will probably need to be retuned. Do you have the GMPP tune? If so, have you checked the conections on your 2 MAP sensors? Are they soldered or crimped? If they're crimped, solder them before you go replacing anything!
 
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