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Home › Chevrolet › 2008 › Uplander Base, 3.9 1 › Repair and Diagnosis › Electrical › Charging Systems › Battery, Charging System And Starting System › Diagnostic Information and Procedures › DTC B1420 › Circuit/System Testing

Circuit/System Testing

  1. If the DTC is history, refer to Charging System Test .
  2. Ignition On and the engine running, test for 9.5-17.5 volts between the battery positive voltage and the ground circuits of the BCM.
    • If not within the specified range, test the B+ circuits for a short to ground or an open/high resistance, and the ground circuits for a open/high resistance.
  3. If all the circuits test normal, test or replace the BCM.
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