What Does C0620 Mean?
This code indicates the ABS/ESC control module has detected a fault in the right front wheel speed or position sensor circuit. The sensor may be providing an implausible signal, no signal, or an intermittent signal that doesn't correlate with vehicle speed and other wheel sensors. This affects the anti-lock braking system, traction control, and electronic stability control functions.
Common Causes
45%
Damaged, contaminated, or failed right front wheel speed sensor due to debris buildup, physical damage, or internal component failure
30%
Damaged or corroded wiring harness and connector between the sensor and ABS module, often caused by road debris, moisture intrusion, or improper routing
15%
Damaged, worn, or missing reluctor ring/tone ring on the wheel hub assembly or CV axle with excessive air gap or debris interference
10%
ABS control module internal fault or poor ground connection affecting sensor signal processing
Diagnostic Steps
1
Step 1: Perform a visual inspection of the right front wheel speed sensor, wiring harness, and connector for physical damage, corrosion, bent pins, or debris contamination. Check sensor mounting for tightness and proper positioning.
2
Step 2: Measure the air gap between the wheel speed sensor tip and reluctor ring using feeler gauges (typical spec 0.020-0.050 inches). Inspect reluctor ring for missing teeth, damage, or excessive runout while rotating the wheel.
3
Step 3: Using a digital multimeter, test sensor resistance (typically 800-1400 ohms for passive sensors) and perform a voltage output test by manually rotating the wheel and observing AC voltage generation (should produce 0.2-2.0V AC at slow rotation).
4
Step 4: Check continuity and resistance of the sensor wiring harness from sensor connector to ABS module connector, looking for opens, shorts to ground, or shorts to power. Inspect for chafed wires along the harness routing path.
5
Step 5: Monitor live data stream for right front wheel speed sensor signal while test driving or using a lift to rotate the wheel, comparing output to other wheel sensors for correlation and proper signal pattern.
6
Step 6: If all sensor circuit tests pass, verify ABS module ground connections are clean and tight, then consider ABS module internal fault if sensor and wiring are confirmed good.
Estimated Repair Cost
$120 - $650
Parts + labor, varies by vehicle and location
This code indicates the ABS/ESC control module has detected a fault in the right front wheel speed or position sensor circuit. The sensor may be providing an implausible signal, no signal, or an intermittent signal that doesn't correlate with vehicle speed and other wheel sensors. This affects the a...
The most common cause of C0620 (Right Front Position Sensor Malfunction) is: Damaged, contaminated, or failed right front wheel speed sensor due to debris buildup, physical damage, or internal component failure
Typical repair costs for C0620 range from $120 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive with normal braking function, but ABS, traction control, and stability control will be disabled or limited. Avoid aggressive driving and exercise caution in wet or slippery conditions. Repair should be completed promptly to restore full safety system functionality.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C0620 to identify the root cause.
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Quick Info
Category
Chassis
System
Anti-lock Braking System (ABS) / Electronic Stability Control (ESC)
Difficulty
Type
Generic (SAE)
Recommended Tools
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