Code Definition

C1237 — Speed Wheel Rear Input Signal Missing

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

About C1237

C1237 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.

C1237 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 ABS module monitors each wheel speed sensor to manage braking, traction control, and stability control functions. DTC C1237 sets when the ABS module does not detect a signal from the rear wheel speed sensor while the vehicle is moving above the diagnostic threshold speed, typically around 8 to 16 km/h. On vehicles equipped with a single rear axle sensor, this sensor is usually mounted on the differential housing or transfer case and reads a tone ring on the pinion shaft or driveshaft to provide combined rear axle speed information. When this code is set, ABS, traction control, and stabilit...

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