Code Definition

C1871 — Air Suspension Gate Solenoid Output Circuit Short To Battery

System: Chassis  |  Type: Manufacturer-Specific  |  Make: Ford

About C1871

C1871 is a manufacturer-specific chassis diagnostic trouble code recorded for Ford vehicles. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C1871 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit.

Scanning & clearing: Chassis (C) codes are stored in the ABS, traction control, or stability-control modules. An enhanced or OEM-level scan tool is usually required to read and clear them.

C1871 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

This code relates to the air suspension system. The air suspension control module operates a gate solenoid, an isolation valve in the valve block that opens and closes the air passages between the compressor, reservoir, and the air springs so the module can direct airflow during leveling. DTC C1871 sets when the module detects that the gate solenoid output circuit is shorted to battery voltage, so the output reads high when it should be controlled by the module. This is usually caused by the control wire chafing against a positive feed, a short within the solenoid, or connector contamination b...

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