Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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The only repair for theses codes is to Install the latest Powertrain Control Module (PCM) calibration.
The ECM has a flaw on the software causing theses codes.
When you update the software you will install the latest software on the ECM, the software will improve different areas of the truck, if will improve the fuel millage? maybe all this depends if you have the truck maintenance update, like air filter fuel filter and spark plugs.