Code Definition

C1742 — Rear Sounder Circuit Failure

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

About C1742

C1742 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 C1742 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.

C1742 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 rear parking aid system warns the driver of obstacles while reversing by generating a variable rate warning tone of approximately 750 Hz through a dedicated rear sounder, a small speaker usually mounted behind the rear quarter trim or parcel shelf. The Parking Aid Module (PAM) drives the sounder directly and monitors the circuit, and DTC C1742 is set when the module detects an open circuit or a short on the rear sounder drive circuit. Moisture intrusion through body seams and tail lamp seals is a documented cause on many Ford models, corroding the sounder connector or the PAM pins and inte...

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