Air Suspension Compressor Relay Short to Ground
The C1932 code indicates that the Air Suspension Control Module (ASCM) has detected a short to ground in the control circuit for the front compressor relay. This prevents the module from energizing the relay to power the compressor, disabling the ability to raise or maintain pressure in the front air suspension system.
1. Commonly Affected Makes
2. Most Common Causes
- Air suspension compressor relay with internal short to ground
- Wiring in the relay control circuit (between ASCM and relay terminals 85/86) chafed or pinched against chassis ground
- Corrosion or moisture in the relay or ASCM connector causing a ground path
- Faulty ASCM with internal driver shorted to ground
3. Symptoms You Will Notice
- Front suspension unable to raise or maintain ride height
- Air suspension warning light illuminated on dashboard
4. Step-by-Step Diagnosis
Check for technical service bulletins (TSBs) related to the air suspension system
Inspect the compressor relay and its wiring for signs of damage, corrosion, or short to ground
Test the relay control circuit between the ASCM and relay for continuity to ground
If wiring and relay are okay, test the ASCM output by commanding the relay on/off with a scan tool; if no response, suspect faulty ASCM
5. Frequently Asked Questions
Is it safe to drive?▼
Driving is possible but not recommended for long distances because the front suspension may not maintain proper ride height, affecting handling and ride comfort. Have the system repaired as soon as possible.
How much does it cost to fix?▼
Repair costs typically range from $150 to $600, depending on whether the issue is a faulty relay ($20–$80), wiring repair ($100–$300), or ASCM replacement ($400–$800).