What Does C1224 Mean?
The ABS module detects a zero-speed input from the right rear wheel speed sensor while the vehicle is in motion. This means the sensor is not generating any signal as the wheel turns. ABS, traction control, and stability control (if equipped) will be disabled, and the corresponding dashboard warning lights will be on.
Common Causes
35%
Defective or contaminated right rear wheel speed sensor
30%
Wiring fault or corroded connector in the right rear sensor circuit
20%
Cracked, damaged, or debris-packed right rear tone ring
10%
Worn right rear wheel bearing causing excessive sensor air gap
5%
ABS module internal failure on right rear speed input channel
Diagnostic Steps
1
View live wheel speed data for all four corners at 25+ mph — verify the right rear reads 0 mph while the others display correct, matching speeds.
2
Inspect the right rear sensor connector for corrosion, water intrusion, or damage. Measure sensor resistance across the signal pins — normal is 800-2000 ohms depending on make.
3
With the right rear wheel raised and spinning by hand, measure AC voltage output at the sensor connector — expect 100-700 mV AC. Zero voltage indicates a failed sensor or tone ring issue.
4
Inspect the right rear tone ring visually for missing teeth, cracks, heavy rust buildup between teeth, or any mechanical damage that would disrupt signal generation.
5
Trace the wiring harness from the right rear sensor to the ABS module, checking for chafing against suspension components, pinched wires, or rodent damage. Test continuity end-to-end.
Estimated Repair Cost
$80 - $350
Parts + labor, varies by vehicle and location
The ABS module detects a zero-speed input from the right rear wheel speed sensor while the vehicle is in motion. This means the sensor is not generating any signal as the wheel turns. ABS, traction control, and stability control (if equipped) will be disabled, and the corresponding dashboard warning...
The most common cause of C1224 (Right Rear Wheel Speed Sensor Input Signal is 0) is: Defective or contaminated right rear wheel speed sensor
Typical repair costs for C1224 range from $80 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
ABS and traction control are non-functional for the right rear. Basic braking works normally, but ABS intervention will not occur during emergency braking. Drive cautiously, avoid abrupt braking maneuvers, and allow extra stopping distance. Safe to drive to a repair shop at moderate speed.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1224 to identify the root cause.
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Quick Info
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ABS / Traction Control
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