What Does C1222 Mean?
The ABS module is receiving a zero-speed signal from the right front wheel speed sensor, even though the vehicle is in motion. This indicates the sensor is not generating a valid AC voltage signal as the tone ring rotates. The driver will likely see the ABS and traction control warning lights illuminated, and both systems will be disabled on that corner.
Common Causes
35%
Damaged or contaminated right front wheel speed sensor (cracked, corroded, or debris-packed)
30%
Broken or corroded wiring/connector between sensor and ABS module
20%
Damaged, cracked, or missing teeth on the right front tone ring (reluctor ring)
10%
Excessive air gap between sensor and tone ring due to worn wheel bearing
5%
Internal ABS module failure on the right front input channel
Diagnostic Steps
1
Check live data PIDs for all four wheel speed sensors while driving at 25+ mph — confirm the right front reads 0 while the others show matching speeds.
2
Inspect the right front wheel speed sensor connector for corrosion, bent pins, or water intrusion. Measure sensor resistance across the two signal pins — expect 800-2000 ohms (varies by manufacturer). An open or short indicates a failed sensor.
3
With the wheel raised and spinning by hand, use an AC voltmeter on the sensor leads — you should see 100-700 mV AC. Zero output confirms a dead sensor or damaged tone ring.
4
Visually inspect the tone ring (reluctor ring) on the right front hub for missing teeth, cracks, rust packing between teeth, or debris buildup that would prevent proper signal generation.
5
Check wiring continuity from the sensor connector back to the ABS module pins using a wiring diagram. Wiggle-test the harness along its routing path while monitoring resistance for intermittent opens.
Estimated Repair Cost
$80 - $350
Parts + labor, varies by vehicle and location
The ABS module is receiving a zero-speed signal from the right front wheel speed sensor, even though the vehicle is in motion. This indicates the sensor is not generating a valid AC voltage signal as the tone ring rotates. The driver will likely see the ABS and traction control warning lights illumi...
The most common cause of C1222 (Right Front Wheel Speed Sensor Input Signal is 0) is: Damaged or contaminated right front wheel speed sensor (cracked, corroded, or debris-packed)
Typical repair costs for C1222 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 disabled for the right front corner. Normal braking still works, but ABS will not engage during hard braking or on slippery surfaces, increasing stopping distance. Avoid aggressive driving and allow extra following distance, especially in wet or icy conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1222 to identify the root cause.
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Quick Info
Category
Chassis
System
ABS / Traction Control
Difficulty
Type
Manufacturer
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