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 2269 (BATTERY, CHARGING SYSTEM AND STARTING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0562CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Testing
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2010 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connectors at the ECM.
- Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the ground circuit terminals listed below and ground:
- Terminal 1 X2 (3.6L LY7 LTT)
- Terminal 2 X2 (3.6L LY7 LTT)
- Terminal 4 X2 (3.6L LY7 LTT)
- Terminal 73 X2 (4.6L LH2)
- Terminal 73 X3 (4.6L LH2)
- If greater than the specified range, test the ground circuits for an open/high resistance.
- Ignition ON, verify a test lamp illuminates between the B+ / IGN circuit terminals listed below and ground.
- IGN terminal 3 X2 (3.6L LY7 LTT)
- IGN terminal 5 X2 (3.6L LY7 LTT)
- IGN terminal 6 X2 (3.6L LY7 LTT)
- IGN terminal 54 X2 (3.6L LY7 LTT)
- B+ terminal 56 X2 (3.6L LY7 LTT)
- IGN terminal 13 X2 (4.6L LH2)
- IGN terminal 28 X2 (4.6L LH2)
- IGN terminal 19 X1 (4.6L LH2)
- B+ terminal 20 X1 (4.6L LH2)
- If the test lamp did not illuminate, test the B+ / IGN circuits for an open/high resistance.
- If the circuits test normal, replace the ECM.
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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.