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Home >> GMC >> 2012 >> Yukon Hybrid, RWD >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Electric Converters and Controllers >> Hybrid/EV Control System >> Diagnostic Information and Procedures >> DTC P1A89 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the X2 harness connector at the K1 accessory DC power control module.
  2. Ignition ON, command the accessory DC power control module Intermediate Voltage Control on the scan tool to turn On the 42 volt circuit.
  3. Test for 40-44 V between the 42 V reference output terminals 1 and 2 at the K1 accessory DC power control module.
    • If less than the specified range, replace the K1 accessory DC power control module.
  4. If the accessory DC power control module 42 V output tests normal, replace the K43 power steering control module.