What Does C1260 Mean?
The ABS control module has detected a wheel speed comparison failure at the right rear wheel. The right rear wheel speed sensor is reporting data that is significantly inconsistent with the other wheel speed sensors during normal driving. This could indicate a sensor issue, mechanical problem, or tire mismatch at this wheel position.
Safety Warning
Incorrect wheel speed comparison data causes unreliable ABS and traction control operation. Emergency braking performance may be unpredictable. Diagnose and repair soon.
Common Causes
30%
Mismatched tire size or significantly different tread depth on the right rear wheel
25%
Contaminated or failing right rear wheel speed sensor providing inaccurate readings
25%
Damaged or corroded right rear ABS tone ring with missing or deformed teeth
20%
Worn right rear wheel bearing causing variable sensor air gap
Diagnostic Steps
1
Step 1: Verify all four tires are the same size and specification. Check tread depth at all four corners — more than 3/32" difference between axles can cause comparison failures.
2
Step 2: Monitor all four wheel speeds via live data at a steady speed. Identify if the right rear consistently reads higher or lower than the left rear.
3
Step 3: Inspect the right rear sensor mounting, air gap, and tone ring condition. Remove any metallic debris from the sensor face.
4
Step 4: Check the right rear wheel bearing for play or roughness by jacking up the wheel and spinning it while listening for noise and feeling for lateral movement.
5
Step 5: If all mechanical checks pass, swap the left and right rear sensors to determine if the fault follows the sensor. Clear codes, test drive at highway speed, and verify.
Estimated Repair Cost
$80 - $450
Parts + labor, varies by vehicle and location
The ABS control module has detected a wheel speed comparison failure at the right rear wheel. The right rear wheel speed sensor is reporting data that is significantly inconsistent with the other wheel speed sensors during normal driving. This could indicate a sensor issue, mechanical problem, or ti...
The most common cause of C1260 (Speed Wheel RR Comparison Failure) is: Mismatched tire size or significantly different tread depth on the right rear wheel
Typical repair costs for C1260 range from $80 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Incorrect wheel speed comparison data causes unreliable ABS and traction control operation. Emergency braking performance may be unpredictable. Diagnose and repair soon.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1260 to identify the root cause.
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Quick Info
Category
Chassis
System
Anti-lock Brake System (ABS) / Traction Control System
Difficulty
Type
Manufacturer
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