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Pinpoint Test B : Wheel Speed Sensor Erratic Signal Faults: Notes

Normal Operation and Fault Conditions 

The wheel speed sensor uses the encoder (tone wheel) on the wheel bearing to generate a square wave signal proportional to wheel speed that is sent to the ABS module. The wheel bearing, encoder and wheel speed sensor must be undamaged and free from any contamination to produce a clean signal for use by the ABS module. Also, all 4 tires and wheels must be of the same manufacturer recommended size for the wheel speed sensor to generate an accurate wheel speed signal.

DTC Fault Trigger Conditions 

DTC Description Fault Trigger Conditions
C0030:07
C0033:07
C0036:07
C0039:07		 Left Front Tone Wheel: Mechanical Failure
Right Front Tone Wheel: Mechanical Failure
Left Rear Tone Wheel: Mechanical Failure
Right Rear Tone Wheel: Mechanical Failure		 These Diagnostic Trouble Codes (DTCs) set in continuous memory and on-demand if there is damage to the wheel speed sensor encoder, damage to the wheel bearing, or contamination or deformation of the wheel bearing seal.
C0031:07
C0034:07
C0037:07
C003A:07		 Left Front Wheel Speed Sensor: Mechanical Failure
Right Front Wheel Speed Sensor: Mechanical Failure
Left Rear Wheel Speed Sensor: Mechanical Failure
Right Rear Wheel Speed Sensor: Mechanical Failure		 These Diagnostic Trouble Codes (DTCs) set in continuous memory and on-demand if the wheel speed sensor, encoder or wheel bearing is damaged, or if the wheel bearing is not installed correctly. These Diagnostic Trouble Codes (DTCs) also set if an incorrectly sized tire is installed on the vehicle or if an excessive air gap exists between the wheel speed sensor and the encoder due to an incorrect component being installed.
C0031:29
C0034:29
C0037:29
C003A:29		 Left Front Wheel Speed Sensor: Signal Invalid
Right Front Wheel Speed Sensor: Signal Invalid
Left Rear Wheel Speed Sensor: Signal Invalid
Right Rear Wheel Speed Sensor: Signal Invalid		 These Diagnostic Trouble Codes (DTCs) set in continuous memory and on-demand if the wheel speed sensor is damaged, if the tone wheel is missing or damaged, if there is an excessive gap between the sensor and encoder, if the wrong sensor is installed (bi-directional versus uni-directional) or if the tire size is incorrect for the vehicle.
C0031:2F
C0034:2F
C0037:2F
C003A:2F		 Left Front Wheel Speed Sensor: Signal Erratic
Right Front Wheel Speed Sensor: Signal Erratic
Left Rear Wheel Speed Sensor: Signal Erratic
Right Rear Wheel Speed Sensor: Signal Erratic		 These Diagnostic Trouble Codes (DTCs) set in continuous memory and on-demand if the wheel speed sensor is damaged, if the tone wheel is missing or damaged, if there is an excessive gap between the sensor and tone ring or high frequency interference.
C0031:64
C0034:64
C0037:64
C003A:64		 Left Front Wheel Speed Sensor: Signal Plausibility Failure
Right Front Wheel Speed Sensor: Signal Plausibility Failure
Left Rear Wheel Speed Sensor: Signal Plausibility Failure
Right Rear Wheel Speed Sensor: Signal Plausibility Failure		 These Diagnostic Trouble Codes (DTCs) set in continuous memory and on-demand if the wheel speed sensor is damaged, if the tone wheel is missing or damaged, if there is an excessive gap between the sensor and tone ring, if the wrong sensor is installed (bi-directional versus uni-directional) or if the tire size is incorrect for the vehicle.

Possible Causes 

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