C1146: Speed Wheel Sensor RF Circuit Open

Definition

The OBD2 code C1146 indicates that there is an open circuit in the right front speed wheel sensor, which means the vehicle's system is not receiving a signal from that sensor

Common causes

Faulty speed wheel sensor
Damaged wiring or connectors
Poor electrical connections
Corroded terminals
Open circuit in the sensor wiring
Faulty ABS control module
Incorrect sensor installation or alignment

Common misdiagnoses

Faulty wheel speed sensor
Damaged wiring or connectors
ABS control module failure
Brake system issues
Incorrect tire size or pressure
Faulty vehicle speed sensor
Issues with the anti-lock braking system (ABS) module
Problems with the traction control system

Troubleshooting steps

1. Visual Inspection
2. Check the wiring and connectors leading to the right front wheel speed sensor for any signs of damage, corrosion, or loose connections
3. Inspect the sensor itself for physical damage or debris that may be obstructing it
4. Check Sensor Resistance
5. Disconnect the wheel speed sensor connector and use a multimeter to measure the resistance of the sensor. Compare the reading to the manufacturer's specifications. If the resistance is out of range, the sensor may need to be replaced
6. Check for Open Circuit
7. With the sensor still disconnected, check the wiring harness for continuity. Use a multimeter to test for continuity between the sensor connector and the ABS module. If there is no continuity, there may be a break in the wire
8. Check Voltage Supply
9. Reconnect the sensor and check for the proper voltage supply at the connector while the vehicle is on. The voltage should match the specifications provided by the manufacturer
10. Test the Sensor
11. If the sensor is a passive type, you can test it by spinning the wheel and checking for an AC voltage output. If there is no output, the sensor may be faulty
12. For active sensors, check the output signal with a scan tool or oscilloscope while the vehicle is in motion
13. Inspect the ABS Module
14. If the sensor and wiring are in good condition, the issue may lie within the ABS module itself. Check for any fault codes related to the ABS module and consider testing or replacing it if necessary
15. Clear Codes and Test Drive
16. After performing repairs or replacements, clear the trouble codes using an OBD-II scanner and take the vehicle for a test drive to see if the code returns
17. Refer to the vehicle's service manual for specific diagnostic procedures and specifications related to the wheel speed sensor and ABS system
18. Professional Diagnosis
19. If the issue persists after performing these steps, it may be best to consult a professional mechanic or technician who has access to advanced diagnostic tools. By following these steps, you should be able to identify and resolve the issue related to the C1146 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Visual Inspection

2. Check the wiring and connectors leading to the right front wheel speed sensor for any signs of damage, corrosion, or loose connections

3. Inspect the sensor itself for physical damage or debris that may be obstructing it

4. Check Sensor Resistance

5. Disconnect the wheel speed sensor connector and use a multimeter to measure the resistance of the sensor. Compare the reading to the manufacturer's specifications. If the resistance is out of range, the sensor may need to be replaced

6. Check for Open Circuit

7. With the sensor still disconnected, check the wiring harness for continuity. Use a multimeter to test for continuity between the sensor connector and the ABS module. If there is no continuity, there may be a break in the wire

8. Check Voltage Supply

9. Reconnect the sensor and check for the proper voltage supply at the connector while the vehicle is on. The voltage should match the specifications provided by the manufacturer

10. Test the Sensor

11. If the sensor is a passive type, you can test it by spinning the wheel and checking for an AC voltage output. If there is no output, the sensor may be faulty

12. For active sensors, check the output signal with a scan tool or oscilloscope while the vehicle is in motion

13. Inspect the ABS Module

14. If the sensor and wiring are in good condition, the issue may lie within the ABS module itself. Check for any fault codes related to the ABS module and consider testing or replacing it if necessary

15. Clear Codes and Test Drive

16. After performing repairs or replacements, clear the trouble codes using an OBD-II scanner and take the vehicle for a test drive to see if the code returns

17. Refer to the vehicle's service manual for specific diagnostic procedures and specifications related to the wheel speed sensor and ABS system

18. Professional Diagnosis

19. If the issue persists after performing these steps, it may be best to consult a professional mechanic or technician who has access to advanced diagnostic tools. By following these steps, you should be able to identify and resolve the issue related to the C1146 code