What Does C1168 Mean?
This code indicates the ABS control module has detected a coherency fault with the right rear wheel speed sensor. The RR wheel speed reading significantly deviates from the expected value calculated from the other three sensors during normal straight-line driving, indicating a sensor, tone ring, or tire mismatch issue at the right rear corner.
Safety Warning
ABS may activate incorrectly or be disabled. Traction control may behave erratically. Repair promptly.
Common Causes
30%
Incorrect tone ring installed with wrong tooth count from aftermarket or wrong-application hub assembly
25%
Tone ring damage with multiple teeth affected, causing incorrect speed calculation
20%
Different tire size on the right rear compared to the other wheels
15%
Intermittent sensor signal from loose wiring or connector causing speed calculation errors
10%
Worn wheel bearing causing variable sensor air gap
Diagnostic Steps
1
Step 1: Verify all four tires are the same size and check pressures. Compare tread depth across all tires.
2
Step 2: Monitor all four wheel speeds in live data at a steady 30 mph. Identify which sensor reading deviates.
3
Step 3: Check the RR tone ring tooth count against specifications and compare to the left rear.
4
Step 4: Use an oscilloscope to examine the RR sensor waveform for irregularities, dropouts, or amplitude variations.
5
Step 5: Correct the root cause, clear codes, and road test verifying consistent wheel speed readings.
Estimated Repair Cost
$80 - $500
Parts + labor, varies by vehicle and location
This code indicates the ABS control module has detected a coherency fault with the right rear wheel speed sensor. The RR wheel speed reading significantly deviates from the expected value calculated from the other three sensors during normal straight-line driving, indicating a sensor, tone ring, or ...
The most common cause of C1168 (Speed Wheel Sensor RR Coherency Fault) is: Incorrect tone ring installed with wrong tooth count from aftermarket or wrong-application hub assembly
Typical repair costs for C1168 range from $80 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
ABS may activate incorrectly or be disabled. Traction control may behave erratically. Repair promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1168 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
Recommended Tools
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