Code Definition

C1881 — Air Suspension RF Height Sensor Circuit Failure

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

About C1881

C1881 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 C1881 is stored, the module has detected 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.

C1881 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

The air suspension control module uses a ride height sensor at each monitored corner to measure suspension travel and maintain the target ride height. DTC C1881 sets when the module detects a failure in the right front height sensor circuit, such as a signal that is missing, out of range, or not changing as the suspension moves. The sensor is typically a linkage driven position sensor that reports corner height to the module as a voltage or frequency signal referenced to a supply and ground from the module. When this code is stored the module cannot trust the right front height reading, so it ...

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