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

WARNING: This page is about a different car, the 2015 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

Normal Operation and Fault Conditions 

The wheel speed sensor uses the tone ring to generate a square wave signal proportional to wheel speed which is sent to the ABS module. The front wheel bearings, rear axle shafts, encoder (tone) rings and wheel speed sensors 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.

The front wheel speed sensors and encoder rings are part of the front wheel hub and bearing assembly.

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 if there is damage to the wheel speed sensor or tone ring. After module initialization and when vehicle speed is above 48 km/h (30 mph), the ABS module monitors the raw wheel speed sensor signal for a cyclically reoccurring gap or slope in the signal. This indicates a possible missing tooth in the tone ring. If the signal is incorrect for more than 1 minute, the DTC is set.
C0031:24
C0034:24
C0037:24
C003A:24		 Left Front Wheel Speed Sensor: Signal Stuck High
Right Front Wheel Speed Sensor: Signal Stuck High
Left Rear Wheel Speed Sensor: Signal Stuck High
Right Rear Wheel Speed Sensor: Signal Stuck High		 After the ABS has initialized, wheel speed sensor supply voltage is above 9 volts and vehicle speed exceeds 60 km/h (37 mph) for more than 5 seconds, the ABS module monitors wheel speed sensor signal plausibility. If one or more wheel speed signals does not match the other and exceeds a pre-set parameter, one or more of these Diagnostic Trouble Codes (DTCs) set in continuous memory.
C0031:25
C0034:25
C0037:25
C003A:25		 Left Front Wheel Speed Sensor: Signal Shape / Waveform Failure
Right Front Wheel Speed Sensor: Signal Shape / Waveform Failure
Left Rear Wheel Speed Sensor: Signal Shape / Waveform Failure
Right Rear Wheel Speed Sensor: Signal Shape / Waveform Failure		 After module initialization, the ABS module monitors each wheel speed sensor input waveform and sets one or more of these Diagnostic Trouble Codes (DTCs) in continuous memory or on-demand if the waveform is implausible when compared to other inputs.
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		 After the ABS module is initialized, wheel speed sensor supply voltage is above 9 volts and vehicle speed exceeds 60 km/h (37 mph) for 72 seconds the ABS module compares the wheel speed signals to each other and to a calculated reference speed. If the difference between maximum and minimum wheel speed related to the calculated reference speed exceeds 16% or the difference between the left wheel speed sensor and the right wheel speed sensor on same axle exceeds 5% one or more of these Diagnostic Trouble Codes (DTCs) sets in continuous memory or on-demand.
C0031:38
C0034:38
C0037:38
C003A:38		 Left Front Wheel Speed Sensor: Signal Frequency Incorrect
Right Front Wheel Speed Sensor: Signal Frequency Incorrect
Left Rear Wheel Speed Sensor: Signal Frequency Incorrect
Right Rear Wheel Speed Sensor: Signal Frequency Incorrect		 After the ABS has initialized, wheel speed sensor supply voltage is above 9 volts and vehicle speed exceeds 60 km/h (37 mph) for more than 5 seconds with no brake pedal input, the ABS module monitors wheel speed sensor signal plausibility. If there is a wheel speed sensor signal plausibility due to interference or a signal disturbance, one or more of these Diagnostic Trouble Codes (DTCs) set in continuous memory.
C0031:65
C0034:65
C0037:65
C003A:65		 Left Front Wheel Speed Sensor: Signal Has Too Few Transitions / Events
Right Front Wheel Speed Sensor: Signal Has Too Few Transitions / Events
Left Rear Wheel Speed Sensor: Signal Has Too Few Transitions / Events
Right Rear Wheel Speed Sensor: Signal Has Too Few Transitions / Events		 After the ABS has initialized, wheel speed sensor supply voltage is above 9 volts and vehicle speed exceeds 60 km/h (37 mph) for more than 5 seconds, the ABS module monitors wheel speed sensor signal plausibility. If a wheel speed sensor signal does not increase past 43 km/h (27 mph), one or more of these Diagnostic Trouble Codes (DTCs) set in continuous memory.
C0031:76
C0034:76
C0037:76
C003A:76		 Left Front Wheel Speed Sensor: Wrong Mounting Position
Right Front Wheel Speed Sensor: Wrong Mounting Position
Left Rear Wheel Speed Sensor: Wrong Mounting Position
Right Rear Wheel Speed Sensor: Wrong Mounting Position		 After the ABS has initialized and the wheel speed sensor signal monitoring is complete, the ABS module monitors wheel speed sensor signal plausibility. If the module detects signal behavior indicating a sensor installation issue (excessive air gap, incorrect mounting position), one or more of these Diagnostic Trouble Codes (DTCs) set in continuous memory.
C006B:00 Stability System Active Too Long: No Sub Type Information This DTC is set if the ABS module detects continuous ABS or EBD control activations for an implausible time period (more than 60 seconds) at one or more wheels.
C1A95:02 Wheel Speed Sensor: General Signal Failure This DTC is set if there is low power to the wheel speed sensors or reverse current on the wheel speed sensor supply is detected.
C1A95:2F Wheel Speed Sensor: Signal Erratic This DTC sets when multiple wheel speed sensors simultaneously exhibit suspicious failure type behavior for more than 500 milliseconds.
C1A95:62 Wheel Speed Sensor: Signal Compare Failure This DTC is set when the ABS module detects one wheel speed sensor mounted in the wrong direction.
C1A95:64 Wheel Speed Sensor: Signal Plausibility Failure This DTC is set when the ABS module monitoring determines an implausible ABS control activation has been requested for more 1 second.

Possible Causes 

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