OBD code C1031 indicates a fault with the Right Rear Wheel Speed Sensor in the AntiLock Brake System (ABS).
Symptoms include the ABS warning light and engine light being illuminated.
This is commonly caused by a faulty sensor, open/shorted sensor harness, or poor electrical connection.
It is a moderate issue that can affect vehicle safety.
To fix, inspect and repair the sensor, harness, and connections as needed.
Repair Importance Level | 10.0 (Out of 10) |
Estimated Repair Time | Approximately 1.0 hour |
Repair Difficulty Level | 10.0 (Out of 10) |
Symptoms of the c1031 OBD Code
The vehicle displays an issue with the ABS hydraulic pump motor circuit.
- Symptoms: AntiLock Brake System (ABS) Warning Light ON.
- Engine Light ON (or Service Engine Soon Warning Light).
- Possible loss of ABS functionality.
- Brake pedal may feel different during braking.
Causes of the c1031 OBD Code
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Possible reasons for fault code C1031 include issues with the ABS control module or wheel speed sensors.
- C1031 can be caused by a Faulty Right Rear Wheel Speed Sensor.
- A Right Rear Wheel Speed Sensor harness that is open or shorted.
- A Right Rear Wheel Speed Sensor circuit with a poor electrical connection.
Fixing Error Code c1031 Step By Step
To address fault code C1031, inspect the ABS module for possible internal faults or wiring issues.
- To fix OBDII code C1031, first, review the possible causes mentioned above.
- Visually examine the corresponding wiring harness and connectors for any damage.
- Check the connector pins for signs of being broken, bent, pushed out, or corroded.
- If no issues are found with the wiring and connectors, proceed to inspect the wheel speed sensor for proper operation and connection.
- Test the wheel speed sensor using a multimeter to ensure it is within specifications.
- Replace the wheel speed sensor if it is faulty.
- Clear the fault codes using a scan tool and test drive the vehicle to verify the repair.
Cost Of Fixing c1031 Fault Code
The repair for fault code C1031 may involve replacing the left rear wheel speed sensor.
The cost to diagnose and fix OBD code C1031 depends on the estimated 1. 0hour repair time.
Labor rates usually range from $75 to $150 per hour, so the total cost could be between $75 and $150. Factors like shop rates and the complexity of the repair can influence the final cost.
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Details of the c1031 OBD Code
Code C1031 relates to an issue with the right front wheel speed sensor circuit.
OBD code C1031 means Left Rear Wheel Speed Sensor Circuit Signal Malfunction.
This code is triggered by the ABS module when it detects a circuit signal malfunction in the left rear wheel speed sensor.
The ABS module monitors the wheel speed sensors to ensure proper ABS operation and traction control.
If the signal from the left rear wheel speed sensor is erratic or absent, the C1031 code is set to indicate a fault in the sensor circuit.
Mechanic’s Tech Notes
Code C1031 indicates an issue with the left front wheel speed sensor circuit.
To diagnose and fix OBDII code C1031, start by checking the Transmission Control Module (TCM) power and ground using a multimeter.
Verify TCM communication over the Controller Area Network (CAN) network with a scan tool.
If the TCM does not respond, reprogramming or reflashing may be necessary.
Visually inspect the wiring harness and connectors for any damage, and check connector pins for signs of being broken, bent, pushed out, or corroded.
This thorough inspection can help identify and resolve issues related to code C1031.
FAQ
OBD code C1031 indicates an issue with the right rear wheel speed sensor circuit. Check sensor, harness, and connections for faults to resolve ABS and engine light warnings.
Common symptoms for OBD code C1031 include ABS warning light on, engine light on, caused by faulty right rear wheel speed sensor or related wiring issues. Fix: Inspect and repair sensor and wiring.
Diagnose OBD code C1031 by checking the right rear wheel speed sensor and its wiring for faults. Inspect connectors for damage or corrosion.

Wrap Up
If your ABS warning light is on and you see OBDII code c1031, it may indicate a fault in the right front wheel speed sensor circuit.
This could be caused by a damaged wheel speed sensor, faulty wiring connections, or a problem with the ABS module.
To address OBDII code c1031, start by inspecting the wiring harness and connectors leading to the right front wheel speed sensor.
Look for any signs of damage, corrosion, or loose connections.
Test the sensor itself for proper operation and replace if necessary.