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Home >> Cadillac >> 2009 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 212 (Hybrid Energy Storage System) >> Diagnostic Information and Procedures >> DTC P1A21 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2009 GMC Yukon, 2009 Chevrolet Tahoe, and 2009 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, observe the hybrid battery contactor system request circuit commanded parameter using a scan tool. The contactor system request circuit commanded should be 30 percent.
  2. Ignition ON, observe the DTC information with a scan tool. DTC P1A21 should not set.
  3. Operate the vehicle within the Conditions for Running the DTCs. You may also operate the vehicle within the conditions that you observed from the Freeze Fame/Failure Records data.
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