Help with Codes

[Gary Ross]

I am getting the following codes C0899, C0896, U0121, C0387, B0790, & U0140. Can anyone give me their best guess for the problem? The Vehicle is 2008 Tahoe, 4WD, 5.3 Flex Fuel engine. Thanks in advance.

 

[HiHoeSilver]

@swathdiver

 

[swathdiver]

Welcome to the forum Gary. Is your truck running right now while these codes are showing? Do you have a scan tool that can reset them? I would reset them and see if any return and then begin further diagnostics. This will also tell us if any are old. Some of the codes are accompanied by symptom codes, 2 letters that give further information. We need those as well to help.

Do you have a power take off on your transmission and switch/dial on dash by chance? I suspect a battery or ground problem.