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Kavey, Shop Owner
Category: GMC
Satisfied Customers: 4017
Experience:  General Repair Shop Owner
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My 2008 Tahoe 5.3 mix fuel has three codes 1st. Number7is

Customer Question

My 2008 Tahoe 5.3 mix fuel has three codes 1st. Number7is misfire. Than there is. B2A03 and PO7AA. WHAT DO THESE MEAN
JA: Has the vehicle turned into a gas hog? And how does it start -- same as usual?
Customer: Yes
JA: Are you fixing your Tahoe yourself? What have you tried so far?
Customer: I ran a scan and received the codes. I was low on oil
JA: Anything else you want the mechanic to know before I connect you?
Customer: No
Submitted: 9 months ago.
Category: GMC
Expert:  Kavey replied 9 months ago.

Hello. My name is ***** ***** I will be helping you today.

The only one of those that is relevant is the misfire code. The other two are just some sort of glitch some less expensive scan tools have. Whatever the case they have no meaning to you.

Do you need help with diagnosing the misfire code?

Customer: replied 9 months ago.
Expert:  Kavey replied 9 months ago.

Well the first thing to try is to swap the number 7 coil with another cylinder. A bad coil is usually the issue and swapping it with another known good one will cause the misfire code to switch to that other cylinder if the coil is the issue. Swap the coils, clear the codes and drive it till the check engine light comes back on and recheck the code. If the code is for the cylinder you swapped coils with replace that coil.. if not let me know and we can move on.

Let me know if you need anything further and please be sure to rate my service so I get credit for helping you today. Thanks

Customer: replied 9 months ago.
I will give it a try and let you know
Expert:  Kavey replied 9 months ago.

Sounds good. I will be standing by.

Customer: replied 9 months ago.
Checked coil. Plug. Plug wire. Everything fine
Expert:  Kavey replied 9 months ago.

How did you check them?

Customer: replied 9 months ago.
Checked for defects and the coil as you suggested
Expert:  Kavey replied 9 months ago.

OK The next step would be to either check for an injector pulse with a noid light or listen to it with either a stethescope or rubber hose or something and see if you hear it clicking,