What Does C1867 Mean?
The air suspension rear inflator solenoid output circuit is shorted to battery voltage. Instead of the solenoid being controlled by the module's ground-side switching, it is receiving constant power through a short to the positive battery rail. This can cause the solenoid to stay energized continuously or prevent proper module control. The rear air springs may over-inflate or the module may shut down the circuit as a protective measure.
Common Causes
35%
Chafed or melted wire insulation in the solenoid harness allowing contact with a power-carrying wire or metal component near a power source
25%
Pinched harness at the frame or body creating a short between the solenoid circuit and an adjacent power wire
20%
Water or salt intrusion into the solenoid connector causing a conductive bridge between the solenoid wire and a power terminal
12%
Solenoid internal failure with a short between the coil winding and the power supply terminal
8%
Air suspension control module internal driver failure causing the output to be pulled high
Diagnostic Steps
1
Disconnect the solenoid connector. With the connector unplugged, measure voltage on the module-side connector wire that should be the ground-switched output. If battery voltage is present with the solenoid not commanded, the short is in the harness between the module and solenoid.
2
With the solenoid disconnected, measure the coil terminal-to-ground and terminal-to-power resistance. Any reading below 100 ohms to battery voltage indicates an internal short in the solenoid.
3
Visually inspect the solenoid harness routing for abrasion, pinch points, or areas where insulation has melted from heat exposure. Pay attention to locations near exhaust components, power distribution points, or frame edges.
4
Isolate sections of the harness by disconnecting intermediate connectors (if present) and checking each section independently for a short to battery voltage.
5
If the short is not found in the harness or solenoid, the control module output driver may be internally shorted to the power supply rail. Test by measuring the module output with the harness disconnected.
Estimated Repair Cost
$150 - $900
Parts + labor, varies by vehicle and location
The air suspension rear inflator solenoid output circuit is shorted to battery voltage. Instead of the solenoid being controlled by the module's ground-side switching, it is receiving constant power through a short to the positive battery rail. This can cause the solenoid to stay energized continuou...
The most common cause of C1867 (Air Suspension Rear Inflator Solenoid Output Circuit Short To Battery) is: Chafed or melted wire insulation in the solenoid harness allowing contact with a power-carrying wire or metal component near a power source
Typical repair costs for C1867 range from $150 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A short to battery can cause the solenoid to remain energized, potentially over-inflating the rear air springs or causing excessive compressor cycling. In some cases, the constant current draw can overheat wiring and create a fire risk. The air suspension module will likely disable the system for protection. Have the vehicle diagnosed promptly and avoid driving until the short is repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1867 to identify the root cause.
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Quick Info
Category
Chassis
System
Air Suspension
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
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