What Does C0050 Mean?
This code indicates the ABS/traction control module has detected an abnormal signal from the right rear wheel speed sensor circuit. The wheel speed sensor monitors the rotational speed of the wheel and sends this data to the ABS control module for anti-lock braking, traction control, and stability control functions. The malfunction could be due to a faulty sensor, damaged wiring, contaminated tone ring, or poor electrical connections in the right rear wheel speed circuit.
Safety Warning
ABS, traction control, and stability control systems will be disabled or operate improperly, significantly increasing stopping distances on slippery surfaces and reducing vehicle stability during emergency maneuvers. The vehicle is drivable but should be repaired immediately as braking performance is compromised, especially in adverse conditions.
Common Causes
40%
Damaged or contaminated wheel speed sensor or tone ring (exciter ring) from road debris, brake dust, or corrosion
30%
Broken, chafed, or corroded wiring or connector in the wheel speed sensor circuit
20%
Faulty wheel speed sensor due to internal component failure or damaged magnetic coil
10%
ABS control module internal circuit failure or poor ground connection
Diagnostic Steps
1
Step 1: Perform a visual inspection of the right rear wheel speed sensor, wiring harness, and connector for physical damage, corrosion, moisture intrusion, or loose connections. Check the tone ring (exciter ring) on the axle or hub for damage, missing teeth, or excessive buildup of metallic debris.
2
Step 2: Using a digital multimeter, measure the resistance of the right rear wheel speed sensor across its terminals (typical range 800-1400 ohms for passive sensors, verify against manufacturer specs). Compare reading to specifications and to the other wheel speed sensors for reference.
3
Step 3: With the wheel elevated and transmission in neutral, manually rotate the right rear wheel while monitoring the live wheel speed sensor data on the scan tool. Verify the sensor produces a consistent AC voltage signal (typically 0.3-1.5V AC for passive sensors) and that the signal changes smoothly without dropouts or erratic spikes.
4
Step 4: Inspect the sensor air gap between the sensor tip and tone ring using a feeler gauge (typical gap 0.020-0.050 inches). Check for excessive wheel bearing play by attempting to rock the wheel in and out, as bearing wear can cause improper sensor gap and erratic signals.
5
Step 5: If sensor and wiring test good, check continuity and resistance of the circuit from the sensor connector back to the ABS module connector. Look for opens, shorts to ground, or shorts to power in the wiring harness.
6
Step 6: After repairs, clear the code, perform a test drive including multiple stops and ABS activation if safe to do so, then verify the code does not return and all wheel speed sensors show proper data correlation.
Estimated Repair Cost
$100 - $400
Parts + labor, varies by vehicle and location
This code indicates the ABS/traction control module has detected an abnormal signal from the right rear wheel speed sensor circuit. The wheel speed sensor monitors the rotational speed of the wheel and sends this data to the ABS control module for anti-lock braking, traction control, and stability c...
The most common cause of C0050 (Right Rear Wheel Speed Circuit Malfunction) is: Damaged or contaminated wheel speed sensor or tone ring (exciter ring) from road debris, brake dust, or corrosion
Typical repair costs for C0050 range from $100 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
ABS, traction control, and stability control systems will be disabled or operate improperly, significantly increasing stopping distances on slippery surfaces and reducing vehicle stability during emergency maneuvers. The vehicle is drivable but should be repaired immediately as braking performance is compromised, especially in adverse conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C0050 to identify the root cause.
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Quick Info
Category
Chassis
System
Anti-lock Braking System (ABS) / Traction Control / Stability Control
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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