Code Definition

C1227 — Speed Wheel Sensor LR Input Short Circuit To Battery

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

About C1227

C1227 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 C1227 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) 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.

C1227 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 monitors the left rear wheel speed sensor input circuit for electrical faults that would compromise wheel speed measurement. DTC C1227 sets when the module detects battery voltage on the left rear wheel speed sensor signal circuit, indicating a short to a powered conductor in the sensor wiring or connector. Wheel speed sensors are typically active hall effect or passive variable reluctance devices that generate low voltage signals proportional to wheel rotation, so the presence of battery voltage on the signal line is recognised as an electrical fault. W...

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