Code Definition

C1A56 (51) — Left Front Tyre Pressure Sensor and Transmitter Assembly Not Programmed

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

About C1A56

C1A56 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 C1A56 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.

C1A56 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 Tyre Pressure Monitoring System (TPMS) module monitors identification and learned position data from each tyre pressure sensor. DTC C1A56 with subcode 51 is set when the TPMS module does not recognise a valid, programmed sensor ID for the left front wheel position, indicating that the sensor has not been learned, has been replaced without programming, or its identification data is missing or invalid. This prevents the system from accurately monitoring tyre pressure at that wheel position. When this code is set the TPMS warning lamp is usually illuminated or flashing, the left front pressur...

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