What Does C1793 Mean?
The left rear air spring solenoid output circuit has a short to ground. The air suspension module detects that the solenoid control line is being pulled to ground, preventing it from properly energizing the solenoid. The left rear air spring cannot be inflated or deflated on command, and the vehicle may sit low on that corner. An air suspension warning will be displayed.
Common Causes
35%
Wiring harness chafed against frame or suspension component, shorting to ground
25%
Left rear air spring solenoid with internal short to ground
20%
Water intrusion and corrosion at solenoid connector creating ground path
15%
Air suspension module output driver shorted to internal ground
5%
Ground strap or grounding point issue creating stray ground path
Diagnostic Steps
1
Disconnect the LR solenoid connector and measure resistance from each harness-side pin to chassis ground — both should read infinite (OL). Low resistance on the control pin confirms a short to ground.
2
Test the solenoid itself: measure coil resistance (3-10 ohms) and check each terminal to the solenoid body — must be infinite (OL). Replace if shorted to ground.
3
Inspect the wiring harness routing along the rear axle, trailing arms, and frame rail for bare copper contacting metal. Pay special attention to areas where the harness crosses suspension components that move.
4
Check the connector at the solenoid for standing water, corrosion, or mud/salt buildup that could create a conductive ground path between pins or to the mounting bracket.
5
With the solenoid and module both disconnected, check the harness wire end-to-end for ground shorts to definitively isolate the fault to the harness.
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The left rear air spring solenoid output circuit has a short to ground. The air suspension module detects that the solenoid control line is being pulled to ground, preventing it from properly energizing the solenoid. The left rear air spring cannot be inflated or deflated on command, and the vehicle...
The most common cause of C1793 (Air Suspension LR Air Spring/Shock Solenoid Output Circuit Short To Ground) is: Wiring harness chafed against frame or suspension component, shorting to ground
Typical repair costs for C1793 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The left rear corner of the vehicle may sag, affecting braking balance, handling, and headlight aim. If the sag is significant, avoid highway speeds. The vehicle is drivable at moderate speeds for a short distance to reach a repair facility.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1793 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Chassis
System
Air Suspension System
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
