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Home >> Chevrolet >> 2008 >> Tahoe Base, 6.2 8 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Hybrid Engine Control System) >> Diagnostic Information and Procedures >> DTC P1A89 >> Circuit/System Verification

Circuit/System Verification

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  1. Start the engine.
  2. Using the scan tool, observe the 42V Circuit Voltage parameter on the APM data list.
    • If the voltage is less than 40 volts, proceed to Circuit/System Testing.
  3. Rotate the steering wheel back and forth while stationary.
    • If the voltage is less than 40 volts, the EPS is drawing excessive current. Replace the power steering motor.
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