Code Definition

C1791 — Air Suspension LR Air Spring/Shock Solenoid Output Circuit Open

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

About C1791

C1791 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 C1791 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.

C1791 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 C1791 is a Ford and Lincoln air suspension code indicating the suspension control module has detected an open circuit on the output that drives the left rear air spring or shock solenoid. Unlike the general output failure code, this fault specifically means the module sees no current flow when it commands the solenoid, pointing to a broken wire, an open solenoid coil, or a disconnected or corroded connector in the circuit. The module checks driver feedback each time the output is energized and sets the code when the circuit will not pass current. When this code is set, the module cannot fi...

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