What Does C1930 Mean?
The air suspension module has detected an open circuit in the front compressor relay control circuit. The module cannot complete the electrical path to energize the relay coil, so the compressor will not run. The air suspension system will lose pressure over time and cannot recover to normal ride height.
Common Causes
35%
Open relay coil inside the compressor relay from thermal fatigue or manufacturing defect
30%
Broken wire in the relay control circuit from the module to the relay box
25%
Backed-out pin or corroded terminal in the relay socket
10%
Module internal relay driver open circuit
Diagnostic Steps
1
Step 1: Remove the compressor relay and measure coil resistance across the control terminals (typical: 60-100 ohms). OL reading confirms a burned-out relay.
2
Step 2: With relay removed, check for module command voltage at the relay socket control terminal (key on, system requesting operation). Should see approximately 12V.
3
Step 3: Measure continuity from the module relay output pin to the relay socket control terminal to find any break in the control wire.
4
Step 4: Check relay socket terminals for corrosion and proper spring tension.
5
Step 5: Replace the relay, clear codes, and verify the compressor activates when the system requests pressure buildup.
Estimated Repair Cost
$20 - $350
Parts + labor, varies by vehicle and location
The air suspension module has detected an open circuit in the front compressor relay control circuit. The module cannot complete the electrical path to energize the relay coil, so the compressor will not run. The air suspension system will lose pressure over time and cannot recover to normal ride he...
The most common cause of C1930 (Air Suspension Front Compressor Relay Circuit Open) is: Open relay coil inside the compressor relay from thermal fatigue or manufacturing defect
Typical repair costs for C1930 range from $20 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The air compressor is disabled, preventing the system from maintaining ride height. The vehicle will gradually sag, worsening handling and potentially bottoming out over bumps.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1930 to identify the root cause.
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Quick Info
Category
Chassis
System
Air Suspension System
Difficulty
Type
Manufacturer
Recommended Tools
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