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Home >> Hummer >> 2010 >> H3T Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 23 (Battery, Charging System And Starting System) >> Diagnostic Information and Procedures >> DTC B1566 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2010 GMC Canyon and 2010 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify that the GBCM is installed correctly. The GBCM should be installed on the negative battery cables, with the sensor coil around the negative cables and facing away from the battery, and with the harness connector facing toward the battery.
    • If the GBCM is installed backwards or incorrectly, remove and reinstall the GBCM.
  2. Ignition ON, clear the DTC with the scan tool. Verify that DTC B1566 does not set.
    • If the DTC sets, replace the GBCM.
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