C1259 – OBD-II DTC

OBD-II DTC C1259 – Speed Wheel RF Comparison Failure

DTC C1259 meaning

DTC C1259 refers to a “Speed Wheel RF Comparison Failure.” This diagnostic trouble code indicates that the vehicle’s onboard diagnostic system has detected a discrepancy in the speed readings from the right front wheel speed sensor compared to other wheel speed sensors. This can affect the vehicle’s traction control and anti-lock braking system (ABS) performance.

DTC C1259 symptoms

Common symptoms associated with DTC C1259 may include:

• Illumination of the ABS warning light on the dashboard
• Traction control warning light activation
• Inconsistent or erratic ABS operation
• Loss of traction control functionality
• Potential changes in braking performance

DTC C1259 causes

Several factors can lead to the occurrence of DTC C1259, including:

• Faulty right front wheel speed sensor
• Damaged wiring or connectors related to the wheel speed sensor
• Issues with the ABS control module
• Incorrectly installed or malfunctioning brake components
• Wheel bearing problems affecting sensor readings

DTC C1259 seriousness

DTC C1259 is considered a serious issue as it can compromise the vehicle’s braking and traction control systems. If left unaddressed, it may lead to decreased vehicle stability and increased risk of accidents, especially in adverse driving conditions. It is advisable to diagnose and repair this issue promptly.

How to diagnose DTC C1259

To diagnose DTC C1259, follow these steps:

1. Use an OBD-II scanner to confirm the presence of DTC C1259.
2. Inspect the right front wheel speed sensor for physical damage or disconnection.
3. Check the wiring and connectors for signs of wear, corrosion, or damage.
4. Test the resistance and output voltage of the wheel speed sensor.
5. Examine the ABS control module for any fault codes or issues.
6. Compare the readings from the right front wheel speed sensor with those from the other wheel speed sensors.

How to fix DTC C1259 step-by-step instructions

To fix DTC C1259, follow these steps:

1. Identify and replace any faulty right front wheel speed sensor.
2. Repair or replace damaged wiring or connectors associated with the wheel speed sensor.
3. Inspect and, if necessary, replace the ABS control module.
4. Ensure all brake components are correctly installed and functioning.
5. Check and replace any faulty wheel bearings that may affect sensor readings.
6. Clear the DTC using an OBD-II scanner and perform a test drive to verify the repair.

How to erase DTC C1259

To erase DTC C1259, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn the ignition key to the “ON” position without starting the engine.
3. Access the diagnostic trouble codes menu on the scanner.
4. Select the option to clear or erase the codes.
5. Confirm the action and wait for the scanner to complete the process.
6. Disconnect the scanner and start the vehicle to ensure the code does not reappear.

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.