Code Definition

C1765 — Air Suspension Rear Height Sensor Low Signal Circuit Failure

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

About C1765

C1765 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 C1765 is stored, the module has detected a signal or supply voltage lower than the expected operating range; and a sensor-related fault — the reported value from the named sensor is out of spec.

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.

C1765 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 C1765 is a Ford specific chassis code for the rear height sensor circuit in the four wheel air suspension system fitted to vehicles such as the Expedition and Lincoln Navigator. The rear height sensor converts the distance between the rear axle and the frame into a voltage signal that the air suspension control module uses to maintain correct rear ride height. C1765 sets when the module sees the rear height sensor signal voltage fall below its valid operating range, indicating an open circuit, a poor connection, a short to ground, or an internal sensor fault. With the code set the module s...

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