What Does C1792 Mean?
The left rear air spring solenoid output circuit has a short to battery voltage. The air suspension module detects that the solenoid control line is being fed external battery voltage, preventing proper control of the solenoid. This can cause the solenoid to stay energized (potentially over-inflating) or prevent the module from controlling it. An air suspension fault will be displayed.
Common Causes
35%
Wiring harness damage shorting solenoid wire to adjacent power wire
25%
Solenoid with internal short between coil and power feed
20%
Connector contamination or damage creating path to power terminal
15%
Air suspension module output circuit failure
5%
Aftermarket wiring splice introducing voltage into solenoid circuit
Diagnostic Steps
1
Disconnect the LR solenoid connector and measure voltage on each pin at the harness side with key on — neither should show constant battery voltage. 12V on the control line indicates a short to B+ in the harness.
2
Measure the solenoid coil resistance (3-10 ohms typical) and check for any continuity between the coil terminals and the solenoid power/housing — should be isolated.
3
With the solenoid disconnected and key off, use an ohmmeter to check the solenoid control wire for continuity to any power source wire in the harness — this pinpoints a wire-to-wire short.
4
Inspect the harness routing along the left rear suspension, axle, and underbody for chafing against power supply wiring, fuel pump wiring, or other hot circuits.
5
If all external wiring is clear, disconnect the module connector and re-check for voltage on the solenoid wire — if voltage disappears, the module has an internal fault feeding voltage back.
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The left rear air spring solenoid output circuit has a short to battery voltage. The air suspension module detects that the solenoid control line is being fed external battery voltage, preventing proper control of the solenoid. This can cause the solenoid to stay energized (potentially over-inflatin...
The most common cause of C1792 (Air Suspension LR Air Spring/Shock Solenoid Output Circuit Short To Battery) is: Wiring harness damage shorting solenoid wire to adjacent power wire
Typical repair costs for C1792 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Potentially more serious if the short causes the solenoid to remain energized, which could over-inflate the air spring or continuously vent air. If the vehicle height is abnormal, park the vehicle and have it towed for repair. If height appears normal and the system is in failsafe, careful driving to a repair facility is acceptable.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1792 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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