Code Definition

C1257 — ABS Inlet Valve Coil RR Circuit Short To Ground

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

About C1257

C1257 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 C1257 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.

C1257 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 Anti-lock Brake System (ABS) module energises individual solenoid coils inside the Hydraulic Control Unit (HCU) to modulate brake pressure at each wheel during ABS, traction control, or stability control events. DTC C1257 sets when the ABS module detects that the Right Rear (RR) inlet valve coil drive circuit is shorted to ground, meaning the drive line is being pulled to chassis potential when the module commands the driver off. The inlet valve normally allows pressurised fluid from the master cylinder into the right rear wheel circuit, and the module monitors the resting voltage at the d...

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