928 Vehicle speed sensor (VSS), 939 Vehicle to grid connection auxiliary. Check for damage to the wiring harness connector. 830831 Wear (cause of failure), 10711073 Weather-Pack connectors, 756. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors. Except for misfires and fuel system faults, if the malfunction is not detected in the next 3 driving cycles, the MIL can be extinguished but the trouble. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Utilize freeze frame data to help you determine which codes were stored first. Follow the rule that says to diagnose codes in the order in which they are stored and you will improve you chances for a successful diagnosis. Engine misfire codes, lean exhaust codes, fuel injector codes, and virtually any other drivability or transmission code that is accompanied by a controller communication code can potentially be a pitfall for misdiagnosis. Obviously, this leads to an unsuccessful repair. Checking if the Control Module has Gone Bad: If error code U0126 is the only DTC showing up, your mechanic will inspect the SAS module. Symptoms and stored codes that are present as a reaction to a communication failure are often misdiagnosed and repaired as the cause of the problem.
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