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 DIAGNOSISENGINE MECHANICALSTARTERBATTERY, CHARGING SYSTEM AND STARTING SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC B1517CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Circuit/System Testing
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Testing
B1517 03, B1517 07
- If the DTC is history, refer to Charging System Test .
- Ignition On, record the voltage at the battery terminals. Observe the scan tool BCM battery positive voltage parameter. The battery terminal and BCM parameter should not differ by more than 2 volts.
- If not within the specified range, test the B+ circuits of the BCM X3 terminal 3 and X4 terminal 10 to ground circuit X4 terminal 9.
- If not within the specified range, test the B+ circuits for a short to ground or an open/high resistance and the ground circuit for an open/high resistance.
- If all the circuits test normal, test or replace the BCM.
B1517 5A
- Verify that DTC B1517 5A is set as current.
- Ignition OFF, disconnect the harness connectors X3 and X4 from the BCM.
- Ignition OFF, test for less than 1.0 ohm of resistance between the ground circuit X4 terminal 9 and ground.
- If not within the specified range, test the circuit for an open/high resistance.
- Ignition On, test the B+ circuits X3 terminal 3 and X4 terminal 10 to the ground circuit X4 terminal 9. The B+ circuits should not differ by more than 2 volts.
- If not within the specified range, test the circuit for a short to ground or an open/high resistance.
- If all circuits test normal, replace the BCM.
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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.