Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2002AVALANCHE 2500, RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1430 (DATA COMMUNICATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC U2102 OR U2103ACTION TAKEN WHEN THE DTC SETS
2002 Chevrolet Avalanche 2500, RWD
Action Taken When the DTC Sets
2002 Chevrolet Avalanche 2500, RWDSECTION Action Taken When the DTC Sets
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
- The control module stores the DTC information into memory when the diagnostic runs and fails.
- The malfunction indicator lamp (MIL) turns ON during the second consecutive drive cycles with the error detected in the ECM.
- The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
- The ECM records the operating conditions at the time of turning ON the MIL and stores the data as Freeze Frame information.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.