Code Definition

C1748 — Switch input Circuit Short to Gnd

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

About C1748

C1748 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 C1748 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit.

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.

C1748 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 parking aid system includes a driver operated disable switch that allows the sensors to be switched off, for example when towing a trailer or parking with a bicycle rack fitted. The Parking Aid Module (PAM) supplies a reference voltage to the switch input circuit and watches for the momentary pull to ground that occurs when the button is pressed. DTC C1748 is set when the module sees the switch input held to ground continuously for longer than a plausible button press, indicating either a stuck or jammed switch or a wiring fault grounding the circuit. When the code sets, the parking aid sy...

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