Code Definition

C0037 (12-8A) — Left Rear Wheel Speed Sensor

System: Chassis  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About C0037

C0037 is a generic (obd-ii standard) chassis diagnostic trouble code. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C0037 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.

Because C0037 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Antilock Brake System (ABS) control module monitors the left rear wheel speed sensor circuit for a valid and plausible speed signal relative to the other wheels. DTC C0037 is set when the module detects a circuit fault or an implausible signal from the left rear wheel speed sensor, typically indicating an electrical failure such as an open circuit, short to ground, or short to battery, or a signal that is missing or outside the expected frequency or amplitude range for the vehicle speed. When this code sets the ABS module loses accurate left rear wheel speed data and normally disables ABS,...

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