Code Definition

C1229 — Speed Wheel Sensor Rear Centre Coherency Fault

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

About C1229

C1229 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 C1229 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.

C1229 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 fitted with a rear centre wheel speed sensor (typically on the rear differential or transfer case output to measure overall rear axle speed), the ABS module performs coherency checks between this sensor and the individual wheel speed sensors. DTC C1229 sets when the rear centre sensor reading does not correlate with the average or expected speed derived from the other wheel speed sensors, indicating one of the sensors is providing inaccurate data. This commonly occurs when the rear centre sensor reads significantly higher or lower than the rear wheels would predict during straight ...

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