Code Definition

C1749 — Trailer Input Circuit Failure

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

About C1749

C1749 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 C1749 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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.

C1749 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

On vehicles with a factory tow package, the Parking Aid Module (PAM) receives a trailer detect input so it can automatically disable the rear sensors when a trailer is connected, preventing constant false warnings from the trailer drawbar. The input typically comes from the trailer tow connector or trailer wiring module and changes state when trailer lighting is plugged in. DTC C1749 is set when the PAM detects a failure on this trailer input circuit, such as an open circuit, a short, or an implausible signal state. When the code sets, the rear parking aid may remain active while towing and so...

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