Code 37 - Left Rear Wheel Speed Sensor Continuity: Notes

Toothed wheel generates a voltage pulse as it moves past wheel speed sensor. EBCM uses the frequency of these pulses to determine wheel speed. Amount of voltage generated in each pulse depends on wheel speed and on air gap between wheel speed sensor and toothed wheel.

SERVICE ABS and SERVICE ASR indicators will be on and Code 37 will be set if speed sensor is faulty or if there is a short to voltage or an open in circuit No. 884 or circuit No. 885. Code will set with ignition on and vehicle stopped.

1. Checks for correct resistance reading of wheel speed sensor.
2. Checks for short to battery voltage in wheel speed sensor circuit wires.
3. Checks for open in wheel speed sensor circuit wires.
4. Checks for an intermittent fault that is not currently present.
5. Checks if code resets when ignition is turned on. If Code 37 resets, speed sensor assembly is most likely at fault.
6. Checks if Code 35 sets during road test.
7. Code 35 sets with a problem in speed sensor circuits when vehicle is moving. Code 37 sets when vehicle is stopped. If Code 35 sets at this point, follow diagnostic chart for Code 35.
8. Intermittent may be caused by wheel speed sensor. If Code 37 is reset after sensor replacement, EBCM is detecting a fault in a speed sensor circuit when one does not exist.