Code Definition

C1222 — Speed Wheel Mismatch

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

About C1222

C1222 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.

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.

C1222 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 continuously compares the four wheel speed sensor signals against each other to detect wheel lockup, traction loss, and rotational anomalies. DTC C1222 sets when the module detects that one or more wheel speed sensor readings disagree with the other wheels by more than the expected tolerance under conditions where all wheels should be rotating at similar speeds, such as during straight line driving above a calibrated threshold. The mismatch can be caused by a single sensor reading incorrectly (signal loss, slow response, intermittent dropout), by mismatc...

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