Code Definition

C1805 — Mismatched PCM and/or ABS-TC Module

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

About C1805

C1805 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.

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.

C1805 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 antilock brake and traction control module exchanges configuration data with the Powertrain Control Module (PCM) over the vehicle network so that traction and stability functions match the engine, transmission, axle ratio, and tyre size combination fitted to the vehicle. DTC C1805 sets when the ABS traction control module determines that its stored configuration does not match the data reported by the PCM. This condition is almost always seen after one of the two modules has been replaced, reprogrammed, or fitted with an incorrect part or calibration, rather than from a wiring or component...

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