GM Service Manual Online
For 1990-2009 cars only

Conditions for Setting the DTC

This DTC sets 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 in order 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 the nominal range.
    • Use a scan tool in order to clear this DTC.

Diagnostic Aids

    • Inspect the battery system for proper functionality.
    • This DTC does not require the replacing of the automatic level control (ALC) sensor.
    • This DTC will not cause the LEVELING indicator lamp to flash.
    • Ensure that the automatic leveling control sensor is receiving the correct voltage.
    • Ensure that the ALC sensor has a good ground.