Reading and Clearing Diagnostic Trouble Codes

NOTE: There is no procedure for pulling codes without a scan tool.


Verify that the following conditions are met before performing the On-Demand Self-Test.
- All doors, liftgate, and liftgate glass must be closed.
- The transmission is in PARK.
- The brake pedal position (BPP) switch is not pressed during the test and the parking brake is not set.
- The accelerator pedal is not pressed during this test.

If the concern remains after the inspection, use New Generation STAR (NGS)Tester connected to the Data Link Connector (DLC) to retrieve continuous Diagnostic Trouble Codes (DTCs) and to execute On-Demand Self-Test diagnostics for the air suspension control module.
- If the On-Demand Self-Test is passed and no DTCs are retrieved, go to the Symptom Chart to continue diagnostics. Symptom Related Diagnostic Procedures
- If DTCs are retrieved, go to Air Suspension Control Module Diagnostic Trouble Code (DTC) Index.
- If the air suspension control module cannot be accessed by the NGS Tester, go to Pinpoint Test Q.

1. Fulfill the pre-conditions.
2. Install a battery charger for the On-Demand Self-Test to prevent battery drain.
3. Run the air suspension On-Demand Self-Test.
4. Record all listed DTCs.
5. Troubleshoot any On-Demand Self-Test DTCs first.
6. Recheck DTCs for continuous DTCs.
7. Retest and clear DTCs after repair.