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 MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 149 (HYBRID ENGINE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P06AFCIRCUIT/SYSTEM TESTING
2009 Chevrolet Tahoe Base, 4.8 C
Circuit/System Testing
2009 Chevrolet Tahoe Base, 4.8 CSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON, inspect for ECM DTC P0606, ECM DTC P0A1D, or any U-code communication DTCs.
- If the specified DTCs are set, repair them first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Ignition OFF, disconnect the ECM connector X3 and the PIM connector X1.
- Test for less than 1 ohm resistance on the GMLAN serial data circuits between the ECM and the PIM.
- If greater than the specified range, repair the GMLAN serial data circuit for an open/high resistance condition.
- If within the specified range, inspect the ECM and PIM connectors for proper terminal contact. Repair as necessary.
- Ensure the ECM contains the latest software version. Program as necessary.
- Ignition ON, inspect for ECM DTC P0606 or any U-code communication DTCs.
- If the specified DTCs are set, repair them first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- If only P06AF has reset, replace the ECM and continue with diagnosis.
- Ensure the PIM contains the latest software version. Program as necessary.
- Ignition ON, inspect for ECM DTC P0606 or any U-code communication DTCs.
- If the specified DTCs are set, repair them first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- If only P06AF has reset, replace the PIM.
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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.