GM Service Manual Online
For 1990-2009 cars only

Conditions for Setting the DTC

This code is set when the vehicle's battery voltage momentarily goes above 16.0 V.

Action Taken When the DTC Sets

The detection of leveling output, and the position out-of-range malfunctions are disabled. This is necessary to prevent erroneous detection of malfunction conditions due to engine crank or unusual system voltage conditions.

Conditions for Clearing the DTC

    • The DTC will clear when battery voltage returns to its nominal range.
    • Using a scan tool.

Diagnostic Aids

    • The battery system should be checked for proper functionality.
    • This code does not require the replacing of the Automatic Level Control (ALC) sensor.
    • This code will not cause the LEVELING indicator lamp to flash.
    • Make sure that the automatic leveling control sensor is receiving the correct voltage.
    • Make sure that the ALC sensor has a good ground.