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 G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 191 (BATTERY, CHARGING SYSTEM AND STARTING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0560CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Circuit/System Testing
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
- Verify that DTC P0560 is set as current.
- If the DTC is history, refer to Charging System Test .
- Measure the voltage at the battery terminals and compare it with the scan tool ECM Ignition 1 signal parameter. Verify that battery and Ignition 1 signal readings do not differ more than 2.0 volts.
- If greater than the specified value, test the Ignition 1 and ground circuits of the ECM for an open/high resistance.
- Ignition 1 signal 3.6L X2 terminal 5 and X2 terminal 54
- Ignition 1 signal 4.4L / 4.6L X1 terminal 19 and X2 terminals 13 and 28
- Ground circuits 3.6L X2 terminals 1, 2 and 4
- Ground circuits 4.4L / 4.6L X2 terminal 73 and X3 terminal 73
- If greater than the specified value, test the Ignition 1 and ground circuits of the ECM for an open/high resistance.
- If the circuits test nor mal, 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.