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 MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1840 (BATTERY, CHARGING SYSTEM AND STARTING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURES (BATTERY, CHARGING SYSTEM AND STARTING SYSTEM)DTC P0615CIRCUIT/SYSTEM TESTING (BATTERY, CHARGING SYSTEM AND STARTING SYSTEM)
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Testing (Battery, Charging System And Starting System)
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing (Battery, Charging System And Starting System)
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2009 GMC Savana Special, 2009 GMC Savana Camper Special, 2009 GMC Savana, 2009 Chevrolet RV Cutaway, and 2009 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the crank relay.
- Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5.0 Ξ© between the relay ground circuit terminal 85 and ground.
- If greater than the specified range, test the relay ground circuit for an open/high resistance.
- Ignition OFF, connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.
- With the transmission range selector in park or neutral, cycle the ignition between the off and CRANK position. The test lamp should turn ON and OFF when changing between the commanded states.
- If the test lamp is always On, test the control circuit for short to voltage. If the circuits test normal replace the ECM.
- If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuits test normal replace the ECM.
- If all circuits tests normal, replace the crank relay.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.