Code Definition

C1890 — Air Suspension LF Height Sensor Circuit Open

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

About C1890

C1890 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 C1890 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit; 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.

C1890 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 left front ride height sensor reports front corner height to the air suspension control module so the module can add or vent air and maintain vehicle ride height. DTC C1890 sets when the module detects an open circuit in the left front height sensor, meaning the signal, supply, or ground path is broken and no valid sensor signal is returned. The sensor is a rotary unit linked to the suspension arm that returns a varying signal as the corner travels, so an open leaves the module with no usable height data. When this code is set the front corner may sit low or fail to rise, a suspension warn...

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