Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
System Overview
The Suspension consists of 4 air springs and a reservoir. Each of these components has air lines that go back to a compressor. On this vehicle, the Compressor, Valves and Air Suspension Control Module (ASCM) are integrated into one unit.
The Air Suspension Control uses four ride height sensors to determine the vehicle height. When leveling, the air suspension compressor will move air from the springs to the reservoir and vice versa to independently level each corner up or down.
The Air Suspension Control Module (ASCM) also has an Semi-Active damping system integrated. It consist 3 body acceleration sensors and 2 hub acceleration sensors.
For more detailed information, Refer to AIR SUSPENSION, DESCRIPTION AND OPERATION .
| CONDITION | POSSIBLE CAUSE | ACTION |
| ECU NOT COMMUNICATING/COMPRESSOR NOT RUNNING | POWER AND/OR GROUND ISSUE | CHECK PINS 1. 6, AND 25 FOR VOLTAGE (ABOVE 11.8v) |
| GENERAL COMMUNICATION ISSUE | FOLLOW CAN DIAGNOSTIC TROUBLESHOOTING | |
| "AIR SUSPENSION TEMPORARILY DISABLED" MESSAGE IN THE CLUSTER | VEHICLE MAY BE IN TIRE JACK, WHEEL ALIGNMENT OR TRANSPORT MODE | TURN MODE OFF VIA RADIO OPTIONS (Settings > Suspension) |
| VEHICLE NOT LEVEL | IN PLANT MODE | DISABLE PLANT MODE BY RUNNING "COMPRESSOR CIRCUIT TEST" SCAN TOOL FUNCTION AND DRIVING VEHICLE ABOVE 19 KM/H (12 MPH) FOR AT LEAST ONE MINUTE |
| RIDE HEIGHT NOT CALIBRATED | CALIBRATE VEHICLE USING SCAN TOOL FUNCTION "SET RIDE HEIGHT LEVEL" Refer to SENSOR, HEIGHT, REMOVAL AND INSTALLATION . |
|
| COMPRESSOR WILL NOT RUN CORRECTLY | CHECK PINS 1. 6, AND 25 FOR VOLTAGE (ABOVE 11.8v) | |
| AIR LINE RESTRICTION/BLOCKAGE | PERFORM AIR LEAK TEST Refer to AIR SUSPENSION, DIAGNOSIS AND TESTING . |
|
| RIDE HEIGHT SENSOR LINKAGE OFF OR INCORRECTLY INSTALLED | CONNECT RIDE HEIGHT SENSOR LINKAGE | |
| VEHICLE RAISES/LOWERS ON ITS OWN | UP/DOWN BUTTON STUCK | PHYSICALLY CHECK THE UP/DOWN SWITCH |
| AIR LEAK IS PRESENT | PERFORM AIR LEAK TEST Refer to AIR SUSPENSION, DIAGNOSIS AND TESTING . |
|
| RIDE HEIGHT SENSORS WILL NOT CALIBRATE | AIR MASS LOW | PERFORM COMPLETE SYSTEM FILL Refer to COMPLETE SYSTEM FILL . |
| AIR LINE RESTRICTION/BLOCKAGE | PERFORM THE AIR LEAK TEST Refer to AIR SUSPENSION, DIAGNOSIS AND TESTING . |
|
| RIDE HEIGHT SENSORS | VERIFY RIDE HEIGHT MEASUREMENTS ARE WITH IN SPECIFICATIONS | |
| SCAN TOOL ROUTINE NOT WORKING CORRECTLY | FOLLOW CAN DIAGNOSTIC TROUBLESHOOTING |
Diagnose and repair any system voltage DTCs before continuing with this test.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.