Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Normal Operation and Fault Conditions
2021 Ford Edge SE, 4WDSECTION Normal Operation and Fault Conditions
WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
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 bearing, rear axle shafts, 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.
PPT B ABS MODULE DTC FAULT TRIGGER CONDITIONS
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| C0030:07, C0033:07, C0036:07, C0039:07 | Left Front, Right Front, Left Rear, Right Rear Tone Wheel: Signal Frequency Incorrect | Sets in continuous memory if there is damage to the wheel speed sensor or encoder ring. After ABS 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 encoder 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, Right Front, Left Rear, Right Rear Wheel Speed Sensor: Signal Rate of Change Above Threshold | After the ABShas 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 ABSmodule 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 DTC set in continuous memory. |
| C0031:25, C0034:25, C0037:25, C003A:25 | Left Front, Right Front, Left Rear, Right Rear Wheel Speed Sensor: Signal Erratic | After ABS initialization, the ABS module monitors each wheel speed sensor input waveform and sets one or more 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, Right Front, Left Rear, Right Rear Wheel Speed Sensor: Signal Plausibility Failure | After the ABSis 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 the same axle exceeds 5%, one or more DTCs sets in continuous memory or on-demand. |
| C0031:38, C0034:38, C0037:38, C003A:38 | Left Front, Right Front, Left Rear, 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 DTCs sets in continuous memory. |
| C0031:65, C0034:65, C0037:65, C003A:65 | Left Front, Right Front, Left Rear, 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 DTCs sets in continuous memory. |
| C0031:76, C0034:76, C0037:76, C003A:76, | Left Front, Right Front, Left Rear, 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 DTCs sets in continuous memory. |
| 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. |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.