Code Definition

C1891 — Air Suspension LF Height Sensor Circuit Short To Battery

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

About C1891

C1891 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 C1891 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) 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.

C1891 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 it can add or vent air and keep the vehicle level. DTC C1891 sets when the module detects the left front height sensor signal circuit shorted to battery voltage, meaning the signal is pulled high and held well above its normal operating range. The sensor normally returns a varying low voltage signal as the suspension arm travels, so a short to battery makes the module read an implausibly high, fixed value. When this code is set the front corner may not level correctly, a suspension warning mes...

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