Code Definition

C1771 — Air Suspension Vent Solenoid Output Circuit Open

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

About C1771

C1771 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 C1771 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.

C1771 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

DTC C1771 is a Ford specific chassis code for the vent solenoid output circuit in the four wheel air suspension system fitted to the Expedition, Lincoln Navigator, and related models. The vent solenoid, located on the air compressor and drier assembly, opens when energised to release air from the springs so the module can lower the vehicle. The air suspension control module continuously monitors current flow through its vent solenoid driver, and C1771 sets when it detects an open circuit, meaning no current path exists through the solenoid coil and its wiring. With the code present the system ...

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