Code Definition

C1231 — Speed Wheel Sensor Rear Centre Circuit Open

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

About C1231

C1231 is a manufacturer-specific chassis diagnostic trouble code. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C1231 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit; and 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.

C1231 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 equipped with a rear centre wheel speed sensor mounted at the differential, transfer case output, or driveshaft pickup, the ABS module continuously monitors the sensor circuit for electrical continuity. DTC C1231 sets specifically when the module detects an open circuit on the rear centre wheel speed sensor input, meaning continuity has been lost between the sensor and the module. The module identifies this by measuring an unexpected floating voltage state or by detecting the complete absence of expected sensor signal characteristics. When this code is active, the ABS, traction con...

Join TaT to view the complete code information and diagnostic details.

Quick Facts