C1235: Speed Wheel RR Input Signal Missing

Definition

The OBD2 code C1235 indicates that the speed sensor input signal from the right rear wheel is missing or not detected by the vehicle's control module

Common causes

Faulty wheel speed sensor
Damaged wiring or connectors
Poor electrical connection
Faulty ABS control module
Wheel bearing issues
Brake system problems
Corrosion or dirt on sensor or connector
Incorrectly installed or misaligned sensor

Common misdiagnoses

Faulty wheel speed sensor
Damaged wiring or connectors
ABS control module failure
Incorrect tire size or pressure
Brake system issues
Faulty hub assembly
Issues with the vehicle's computer or software
Problems with the traction control system

Troubleshooting steps

1. Check the Vehicle's Manual

Refer to the vehicle's service manual for specific information related to the C1235 code, including wiring diagrams and component locations
2. Visual Inspection
3. Inspect the right rear wheel speed sensor for any physical damage, such as cracks or breaks
4. Check the wiring and connectors leading to the wheel speed sensor for signs of wear, corrosion, or disconnection
5. Sensor Testing
6. Use a multimeter to test the resistance of the wheel speed sensor. Compare the readings to the specifications in the service manual
7. If the sensor is a Hall effect type, check for proper voltage output when the wheel is turned
8. Connector Inspection
9. Ensure that the connector for the wheel speed sensor is clean and securely connected. Look for bent pins or corrosion
10. Check for Faulty Components
11. If the sensor and wiring appear to be in good condition, consider testing or replacing the wheel speed sensor itself
12. Inspect the ABS control module for any faults or issues
13. Scan for Additional Codes
14. Use an OBD-II scanner to check for any other related trouble codes that may provide additional context for the issue
15. Test Drive
16. After performing repairs or replacements, clear the codes and take the vehicle for a test drive to see if the code reappears
17. Check for Intermittent Issues
18. If the code returns intermittently, consider checking for loose connections or damaged wiring that may only fail under certain conditions
19. Professional Diagnosis
20. If the issue persists after performing the above steps, it may be necessary 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 C1235 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check the Vehicle's Manual

2. Visual Inspection

3. Inspect the right rear wheel speed sensor for any physical damage, such as cracks or breaks

4. Check the wiring and connectors leading to the wheel speed sensor for signs of wear, corrosion, or disconnection

5. Sensor Testing

6. Use a multimeter to test the resistance of the wheel speed sensor. Compare the readings to the specifications in the service manual

7. If the sensor is a Hall effect type, check for proper voltage output when the wheel is turned

8. Connector Inspection

9. Ensure that the connector for the wheel speed sensor is clean and securely connected. Look for bent pins or corrosion

10. Check for Faulty Components

11. If the sensor and wiring appear to be in good condition, consider testing or replacing the wheel speed sensor itself

12. Inspect the ABS control module for any faults or issues

13. Scan for Additional Codes

14. Use an OBD-II scanner to check for any other related trouble codes that may provide additional context for the issue

15. Test Drive

16. After performing repairs or replacements, clear the codes and take the vehicle for a test drive to see if the code reappears

17. Check for Intermittent Issues

18. If the code returns intermittently, consider checking for loose connections or damaged wiring that may only fail under certain conditions

19. Professional Diagnosis

20. If the issue persists after performing the above steps, it may be necessary 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 C1235 code