What Does C1144 Mean?
This code indicates the ABS control module has detected a missing tooth fault on the right rear wheel speed sensor tone ring. The module identified an irregular signal pattern from the RR sensor consistent with physical damage to the reluctor ring teeth, preventing accurate wheel speed calculation at the right rear corner.
Safety Warning
ABS and traction control are likely disabled. Right rear wheel speed monitoring is compromised. Repair promptly.
Common Causes
40%
Cracked or broken right rear tone ring with missing teeth from corrosion and road exposure
25%
Excessive corrosion on tone ring teeth creating irregular signal patterns
20%
Worn wheel bearing causing variable sensor-to-ring air gap
15%
Metallic debris on sensor face distorting signal
Diagnostic Steps
1
Step 1: Raise the vehicle, remove the right rear wheel, and access the tone ring. Inspect for broken, cracked, or missing teeth by rotating the hub/axle through a full revolution.
2
Step 2: Clean the tone ring surface and sensor tip to remove all corrosion and metallic debris.
3
Step 3: Measure the sensor air gap (typical 0.020-0.050 inches) and check for bearing play that could cause gap variation.
4
Step 4: Use an oscilloscope to verify the RR sensor waveform. Rotate the wheel and look for irregular peak spacing indicating a damaged tooth.
5
Step 5: Replace the tone ring or assembly as needed, clear codes, and test drive above 15 mph confirming consistent RR wheel speed data.
Estimated Repair Cost
$150 - $550
Parts + labor, varies by vehicle and location
This code indicates the ABS control module has detected a missing tooth fault on the right rear wheel speed sensor tone ring. The module identified an irregular signal pattern from the RR sensor consistent with physical damage to the reluctor ring teeth, preventing accurate wheel speed calculation a...
The most common cause of C1144 (Wheel Speed Sensor RR Tone Ring Tooth Missing Fault) is: Cracked or broken right rear tone ring with missing teeth from corrosion and road exposure
Typical repair costs for C1144 range from $150 to $550, depending on the vehicle, location, and whether you do it yourself or go to a shop.
ABS and traction control are likely disabled. Right rear wheel speed monitoring is compromised. Repair promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1144 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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