If your scan tool displays C0050, your vehicle’s Anti-lock Braking System (ABS) has detected a problem with the right rear wheel speed sensor circuit.

The right rear wheel speed sensor continuously monitors wheel rotation and sends this information to the Electronic Brake Control Module (EBCM). The EBCM compares wheel speeds from all four corners of the vehicle to control the Anti-lock Braking System (ABS), Traction Control System (TCS), Electronic Stability Control (ESC), and numerous advanced driver-assistance systems.

When the EBCM detects an intermittent, missing, or implausible signal from the right rear wheel speed sensor, it stores C0050 and illuminates the ABS warning light. On many vehicles, the Traction Control and Stability Control warning lights will also illuminate, and certain safety features may be disabled.

For additional chassis diagnostics and repair guides, visit our Complete OBD-II Trouble Code Guide:

https://my.prostreetonline.com/dtc-obdii

Quick Facts

Item	Information
OBD-II Code	C0050
Description	Right Rear Wheel Speed Sensor Circuit
Category	Chassis (C) Codes
System	Anti-lock Braking System (ABS)
Severity	★★★★☆ High
Safe to Drive?	Yes, but ABS and stability control may be disabled
Common Causes	Failed wheel speed sensor, damaged wiring, faulty wheel bearing, corroded connector, damaged tone ring
Typical Repair Cost	$100–600

What Does C0050 Mean?

The C0050 code indicates the Electronic Brake Control Module (EBCM) has detected an electrical or communication fault within the right rear wheel speed sensor circuit.

Although wheel speed sensors are primarily associated with ABS, the information they provide is shared with multiple vehicle systems, including:

Anti-lock Braking System (ABS)
Electronic Stability Control (ESC)
Traction Control System (TCS)
Hill Start Assist
Trailer Sway Control
Adaptive Cruise Control (on equipped models)
Electronic Parking Brake
Torque Vectoring (on some AWD vehicles)

If the EBCM cannot trust the signal from the right rear wheel, it disables or limits these systems to maintain safe vehicle operation.

Symptoms of C0050

Common symptoms include:

ABS warning light illuminated
Traction Control warning light
Stability Control warning
Service Brake System message
Cruise control disabled on some vehicles
Reduced traction on slippery surfaces
Stored C0050 diagnostic code

Unlike engine-related trouble codes, C0050 does not affect drivability or engine performance.

Common Causes

Failed Right Rear Wheel Speed Sensor

Internal electronic failure due to age, moisture, or contamination is the most common cause.

Damaged Tone Ring

The reluctor ring may become:

Cracked
Rusted
Broken
Covered with debris

Any of these conditions can interfere with accurate wheel speed readings.

Worn Wheel Bearing

Many late-model vehicles integrate the magnetic encoder ring into the rear wheel bearing.

A worn bearing or damaged encoder can easily trigger C0050.

Damaged Wiring Harness

Rear suspension movement exposes wiring to:

Chafing
Pinching
Road debris
Rodent damage

Broken wiring is a common source of intermittent faults.

Corroded Connector

Because the connector is exposed beneath the vehicle, corrosion from:

Rain
Road salt
Dirt
Mud

can interrupt communication between the sensor and EBCM.

Electronic Brake Control Module Failure

Although uncommon, an internal failure within the ABS module may falsely report a sensor circuit fault.

How Serious Is C0050?

High.

The vehicle usually remains drivable, but several important safety systems may become unavailable.

Affected systems often include:

Anti-lock Braking System
Electronic Stability Control
Traction Control
Brake Assist
Trailer Stability Assist

Without these systems, stopping distances and vehicle control may be reduced during emergency maneuvers.

Can You Drive With C0050?

Yes—but carefully.

Normal braking remains available, but without ABS and stability control:

Wheels may lock under heavy braking.
Vehicle stability may decrease during evasive maneuvers.
Slippery road performance is reduced.

Repairing the fault promptly is recommended.

How to Diagnose C0050

1. Scan the ABS Module

Use a professional scan tool capable of reading ABS-specific chassis codes and displaying live wheel-speed data.

2. Compare Live Wheel Speed Readings

Drive the vehicle while monitoring all four wheel speed sensors.

The faulty sensor often reports:

Zero speed
Intermittent dropouts
Erratic readings
Values inconsistent with the remaining wheels

3. Inspect the Right Rear Sensor

Look for:

Physical damage
Loose mounting
Excessive metal debris
Cracked housing

4. Inspect Wiring and Connectors

Inspect for:

Broken wires
Loose terminals
Corrosion
Chafed insulation
Pinched harnesses

5. Inspect the Tone Ring and Wheel Bearing

Inspect for:

Broken reluctor ring teeth
Rust buildup
Excessive bearing play
Magnetic encoder damage

Many wheel speed sensor codes are ultimately traced to worn wheel bearings.

Common Repairs

Repair	Estimated Cost
Replace wheel speed sensor	$100–300
Repair wiring harness	$100–250
Replace connector	$75–200
Replace wheel bearing assembly	$250–600
Replace Electronic Brake Control Module	$700–1,500

Common Diagnostic Mistakes

Many technicians replace the sensor immediately without first checking:

Wheel bearing condition
Tone ring integrity
Connector corrosion
Wiring continuity
Live ABS data

Mechanical problems frequently mimic failed electronic sensors.

Vehicles Commonly Affected

C0050 is commonly found on:

Chevrolet Silverado
GMC Sierra
Chevrolet Tahoe
Chevrolet Suburban
Cadillac Escalade
Ford F-150
Ford Expedition
Jeep Wrangler
Jeep Grand Cherokee
Dodge Ram 1500
Toyota Tacoma
Toyota Tundra
Honda Pilot
Nissan Frontier
Subaru Outback

Although repair procedures differ, the underlying causes are largely consistent across manufacturers.

How to Prevent C0050

You can reduce the likelihood of C0050 by:

Inspecting ABS wiring during brake service.
Replacing worn wheel bearings promptly.
Cleaning rust from wheel hubs.
Keeping sensor connectors dry and clean.
Avoiding damage to ABS wiring during suspension work.
Inspecting reluctor rings whenever brake components are removed.

Frequently Asked Questions

What causes C0050?

The most common causes include a failed right rear wheel speed sensor, damaged wiring, worn wheel bearing, cracked tone ring, corroded connector, or an Electronic Brake Control Module fault.

Is C0050 dangerous?

Yes.

Although the vehicle usually remains drivable, losing ABS and stability control reduces braking performance during emergency situations.

Can a wheel bearing cause C0050?

Yes.

Many modern wheel bearings contain the magnetic encoder ring required for accurate wheel speed sensing.

Will C0050 clear itself?

No.

The underlying problem must be repaired before the ABS module clears the code during its self-test.

Will C0050 affect engine performance?

No.

The code only affects chassis systems and does not impact engine or transmission operation.

Final Thoughts

The C0050 code indicates a malfunction within the right rear wheel speed sensor circuit, one of the critical inputs used by the Anti-lock Braking System and several advanced vehicle safety systems. While your vehicle will generally continue to operate normally, losing ABS, traction control, and stability control can significantly reduce braking performance and vehicle control during emergency situations.

Most repairs involve replacing the wheel speed sensor, repairing damaged wiring, replacing a worn wheel bearing, or correcting a damaged reluctor ring. Prompt diagnosis helps restore full braking performance and prevents additional ABS-related faults.

For additional chassis diagnostics and repair guides, browse our complete Chassis (C) OBD-II Code Library:

Complete OBD-II Code Guide: https://my.prostreetonline.com/dtc-obdii/

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