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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 490 (Hybrid/EV Control System) >> Diagnostic Information and Procedures >> DTC P1A89 >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.

The 42 volt circuit is only used by the electronic power steering. The accessory DC power control module can apply 42 volts on the connector without being connected to the electronic power steering.

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