What Does C1798 Mean?
The right rear air spring solenoid output circuit has a short to ground. The control line to the RR solenoid is being pulled to ground, preventing the air suspension module from commanding the solenoid. The right rear air spring cannot be inflated or deflated properly, and the vehicle may sit low on that corner.
Common Causes
35%
Wiring harness chafed against rear suspension or frame components, shorting to ground
25%
Right rear air spring solenoid internally shorted to ground
20%
Water intrusion and corrosion at connector creating ground path
15%
Air suspension module output driver fault
5%
Body ground point or ground strap issue creating stray path
Diagnostic Steps
1
Disconnect the RR solenoid connector and measure resistance from each harness-side pin to chassis ground — should be infinite (OL). Low resistance on the control pin confirms a ground short.
2
Test the solenoid: coil resistance should be 3-10 ohms, and each terminal to body should read infinite. Replace if internally shorted to ground.
3
Trace the harness from the solenoid back to the module, inspecting for bare wire contacting metal along the frame rail, axle, trailing arm, and through any body pass-throughs.
4
Check the connector at the solenoid for water, mud, salt, or corrosion creating a conductive bridge to the mounting bracket or body ground.
5
With both the solenoid and module disconnected, test the harness wire from end to end for ground isolation to confirm whether the fault is in the wiring itself.
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The right rear air spring solenoid output circuit has a short to ground. The control line to the RR solenoid is being pulled to ground, preventing the air suspension module from commanding the solenoid. The right rear air spring cannot be inflated or deflated properly, and the vehicle may sit low on...
The most common cause of C1798 (Air Suspension RR Air Spring/Shock Solenoid Output Circuit Short To Ground) is: Wiring harness chafed against rear suspension or frame components, shorting to ground
Typical repair costs for C1798 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The right rear may sag, causing uneven ride height. This affects braking distribution, handling, and headlight aim. Moderate-speed driving is acceptable for short distances, but avoid loads and highway speeds if the vehicle is visibly leaning. Repair promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1798 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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