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 MANUALSCHEVROLET2006SUBURBAN K2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1793 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 6.6L (LMM) - DTC P02E8 TO DTC P1247)DTC P064CCIRCUIT/SYSTEM TESTING
2006 Chevrolet Suburban K2500, 6.0 U
Circuit/System Testing
2006 Chevrolet Suburban K2500, 6.0 USECTION Circuit/System Testing
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the X1 harness connector at the glow plug control module.
- Measure and record the voltage between the battery positive voltage circuit terminal 1 of the X1 harness connector and ground. The voltage should be B+.
- If voltage is not B+, repair the open or high resistance in the battery positive voltage circuit.
- Ignition OFF, disconnect the X2 harness connector at the GPCM.
- Ignition ON, measure and record the voltage between the ignition 1 voltage circuit terminal 52 and ground.
- If voltage is not B+, test the ignition 1 voltage circuit for a short to ground or an open/high resistance.
- Ignition ON, measure and record the voltage between the ignition 0 voltage circuit terminal 53 and ground.
- If voltage is not B+, test the ignition 0 voltage circuit for a short to ground or an open/high resistance.
- If all circuits test normal, replace the GPCM.
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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.