Code Definition

C1870 — Air Suspension Gate Solenoid Output Circuit Open

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

About C1870

C1870 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 C1870 is stored, the module has detected an open (broken or disconnected) electrical path 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.

C1870 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 C1870 sets when the module detects an open circuit on the gate solenoid output, meaning the expected current flow is not present when the solenoid is commanded on. This is typically caused by an open or high resistance in the control wiring, a failed solenoid coil, or connector corrosion. With this code s...

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