What Does C1873 Mean?
The air suspension right front (RF) air spring solenoid output circuit has a general electrical failure. This solenoid controls airflow to the right front air spring, which is critical for maintaining proper ride height on that corner. The driver will notice the right front of the vehicle sagging or the vehicle leaning to one side, a suspension warning light, and uneven ride quality.
Common Causes
35%
Failed right front air spring solenoid valve due to coil burnout or mechanical seizure from contamination
25%
Wiring fault in the RF air spring solenoid circuit from vibration fatigue, road debris damage, or corrosion
20%
Corroded or damaged connector at the RF solenoid, common from wheel-well splash exposure
12%
Air suspension control module driver circuit failure for the RF solenoid output
8%
Power supply issue (blown fuse or poor relay connection) affecting the air suspension solenoid circuit
Diagnostic Steps
1
Command the RF air spring solenoid on via scan tool bi-directional controls. Listen at the valve block or air spring for the solenoid clicking. Monitor whether the RF corner rises when the compressor also runs.
2
Measure voltage at the RF solenoid connector when commanded. Battery voltage (12-14V) should be present. If voltage is there but no actuation, the solenoid has failed internally.
3
Measure solenoid coil resistance at the disconnected connector (typical range 8-15 ohms). Open or shorted readings indicate solenoid replacement is needed.
4
Check the air suspension fuse and relay. Also verify ground circuit integrity by measuring resistance from the solenoid ground pin to chassis ground (should be under 1 ohm).
5
If power, ground, and solenoid are all good, test the module driver output by monitoring the ground-side switching while commanding the solenoid. No switching indicates a module driver failure.
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
The air suspension right front (RF) air spring solenoid output circuit has a general electrical failure. This solenoid controls airflow to the right front air spring, which is critical for maintaining proper ride height on that corner. The driver will notice the right front of the vehicle sagging or...
The most common cause of C1873 (Air Suspension RF Air Spring Solenoid Output Circuit Failure) is: Failed right front air spring solenoid valve due to coil burnout or mechanical seizure from contamination
Typical repair costs for C1873 range from $200 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
With the RF air spring solenoid failed, the right front corner may sag, causing the vehicle to lean. This affects steering alignment, tire wear, braking balance, and handling stability. The vehicle can be driven cautiously at moderate speeds for short distances, but extended driving with an uneven suspension increases rollover risk in turns and degrades handling.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1873 to identify the root cause.
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Quick Info
Category
Chassis
System
Air Suspension
Difficulty
Type
Manufacturer
Recommended Tools
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