Code Definition

C1704 — Right Rear Sensor Circuit Fault

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

About C1704

C1704 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 C1704 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.

C1704 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

DTC C1704 is set by the Parking Aid Module (PAM) when the right rear outer parking aid sensor responds to the module but its output is faulty or implausible, indicating a problem with the sensor itself rather than a simple open or short in the wiring. The rear parking aid system fires each ultrasonic sensor in turn when reverse is selected and evaluates the returned echo signal, so a sensor that transmits weakly, rings continuously, or returns an invalid response will fail this evaluation. When C1704 sets, the module disables the parking aid function and warns the driver, which on many Ford ap...

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