What Does C1872 Mean?
The air suspension gate solenoid output circuit is shorted to ground. The control module detects that the circuit has an unintended ground path, preventing proper solenoid control. The gate solenoid may actuate unintentionally when powered, or the module may detect the fault and disable the air suspension system entirely. The vehicle may not lower properly or may vent air uncontrollably.
Common Causes
35%
Wire insulation worn through where the gate solenoid harness contacts chassis or frame metal, creating a ground path
25%
Water intrusion and corrosion in the gate solenoid connector creating a conductive bridge to ground
20%
Gate solenoid internal short to ground (coil winding contacting the grounded valve body)
12%
Crushed or pinched harness at a body/frame pass-through grounding the wire to the vehicle structure
8%
Module output driver internally shorted to ground
Diagnostic Steps
1
Disconnect the gate solenoid connector. Measure resistance from each wire at the module-side connector to chassis ground. Any reading below 100 ohms indicates a short to ground in the harness.
2
With the solenoid unplugged, measure resistance from each solenoid terminal to the solenoid body/mounting hardware. Any low reading (below 100 ohms) indicates an internal short in the solenoid.
3
Inspect the harness for areas where it contacts frame, body, or other grounded surfaces. Common failure points are at mounting brackets, exhaust heat shields, and suspension links where vibration causes abrasion.
4
If the harness route is long, disconnect at intermediate points and measure each section to ground to isolate the shorted segment.
5
If the solenoid and harness are clear, disconnect the harness at the module and measure from the module output pin to ground. A low reading indicates the module has an internal driver-to-ground short.
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The air suspension gate solenoid output circuit is shorted to ground. The control module detects that the circuit has an unintended ground path, preventing proper solenoid control. The gate solenoid may actuate unintentionally when powered, or the module may detect the fault and disable the air susp...
The most common cause of C1872 (Air Suspension Gate Solenoid Output Circuit Short To Ground) is: Wire insulation worn through where the gate solenoid harness contacts chassis or frame metal, creating a ground path
Typical repair costs for C1872 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A ground short on the gate solenoid circuit may cause the solenoid to remain actuated when powered, venting air from the springs and lowering the vehicle. Alternatively, the module may disable the circuit, preventing proper ride height adjustment. The vehicle is drivable but the suspension may behave unpredictably. Have it repaired before relying on ride height adjustments.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1872 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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