C0055 Code: Right Rear Wheel Speed Sensor Circuit Malfunction — Diagnosis & Fix Guide

Overview of the C0055 Code

The C0055 code belongs to the chassis‑ABS system and signals a problem with the right‑rear wheel speed sensor circuit. When the ABS control module cannot read a valid pulse from this sensor, it disables ABS and traction‑control functions for that wheel. The fault can stem from a damaged sensor, a broken tone‑wheel, a corroded connector, or a short in the wiring harness. Because the ABS system is safety‑critical, fixing C0055 promptly restores full braking performance and keeps your vehicle legal for emissions testing.

Quick 60‑Second Diagnosis

1. Turn the ignition to ON and watch the ABS warning light. Does it flash or stay solid?
2. Spin the right‑rear wheel by hand and listen for a faint click. No click often means the sensor isn’t generating a pulse.
3. Pull live data with an OBD‑II scanner that can read ABS. If the right‑rear channel reads “0” while the other three wheels show normal values, you’ve likely found the culprit.

If any of these checks fail, move on to the full step‑by‑step guide below.

Symptoms You May Notice While Driving

• ABS light illuminated on the dashboard, sometimes accompanied by a “Brake system malfunction” message.
• Reduced braking efficiency when you press the pedal hard, especially on wet or slippery roads.
• Uneven brake bias – the vehicle may pull to the left (opposite the faulty sensor) during hard stops.
• Loss of traction control if your car is equipped with VSC/TCS; the traction‑control light may also appear.

These symptoms are not a reason to ignore the code. While the engine will still run, the safety‑critical ABS and traction‑control functions are compromised.

Root Causes Explained

Understanding the root cause helps you decide whether a simple connector clean‑up will suffice or if you need a full sensor replacement.

Safety Checklist Before You Begin

• Disconnect the negative battery terminal to avoid accidental shorts while probing the sensor.
• Place the vehicle on jack stands before removing any wheel or brake component.
• Allow the exhaust to cool; a hot exhaust can cause burns when you work near the wheel hub.
• Relieve brake pressure by pumping the brake pedal after the battery is disconnected; this prevents brake fluid from spitting if a line is disturbed.
• Keep a fire‑extinguishing blanket nearby when working near the fuel system, especially on vehicles with rear‑mounted fuel tanks.

Step‑by‑Step Diagnosis & Repair

1. Visual Inspection (Easiest)

• Raise the rear‑right side of the vehicle and remove the wheel.
• Locate the sensor behind the brake rotor. Look for cracked housing, broken tone‑wheel teeth, or torn insulation on the wiring.
• Good sign: Sensor is snug, free of cracks, and the wiring harness is firmly clipped.
• Bad sign: You see torn insulation, a cracked sensor housing, or a connector that looks loose or corroded.

Tools: Flashlight, 10 mm socket (if a retaining bolt is present).

2. Connector Test

• Unplug the sensor harness and spray a small amount of contact cleaner into the connector.
• Re‑plug the connector and wiggle the pins gently.
• Good sign: The connector clicks back into place and pins appear clean.
• Bad sign: Pins are bent, missing, or the connector does not latch securely.

Tools: Flat‑head screwdriver (to pry the connector if needed).

3. Multimeter Voltage Check

• Reconnect the battery and set a digital multimeter to DC volts.
• Back‑probe the sensor’s power wire while a helper slowly rotates the wheel by hand.
• Good sign: Voltage fluctuates smoothly between 0 V and about 5 V as the wheel turns, indicating a functioning sensor.
• Bad sign: Voltage stays flat at 0 V or spikes erratically, pointing to a dead sensor or broken wire.

Tools: Digital multimeter, jack stands, helper.

4. Live Data Scan

• Connect an OBD‑II scanner that can read ABS data (e.g., Autel MaxiScan, Snap‑On).
• Navigate to the Wheel Speed Sensor screen and observe the four wheel channels while rotating the right‑rear wheel.
• Good sign: All four channels increase in count as the wheel spins; the right‑rear channel mirrors the left‑rear within a few counts.
• Bad sign: The right‑rear channel stays at “0” or shows erratic spikes, even though the wheel is moving.

Tools: OBD‑II scanner with ABS capability.

5. Sensor Replacement (Hardest)

If steps 1‑4 confirm a faulty sensor:

1. Remove the wheel and brake caliper. Support the caliper with a strap; do not let it dangle.
2. Locate the sensor—usually bolted to the knuckle or rotor housing. Remove the retaining bolt (commonly 10 mm).
3. Pull the sensor out and disconnect the wiring harness.
4. Install the new sensor (same part number as the original). Torque the bolt to the manufacturer‑specified value (typically 8–10 Nm).
5. Re‑install the brake components, lower the vehicle, reconnect the battery, and clear the code with the scanner.

Tools: 10 mm socket, torque wrench, OBD‑II scanner, safety gloves.

Cost Breakdown

Labor rates vary by region. Prices include tax but not shop fees.

Emissions Test Impact

The ABS system itself does not directly affect emissions, but a failed C0055 code can trigger a “Check Engine” or “OBD‑II readiness” failure on many state inspections. If the ABS module cannot communicate with the power‑train control module, the vehicle may not complete the required readiness monitors, leading to a failed emissions test. Fixing the sensor restores proper communication, allowing the vehicle to clear the code and pass the inspection.

Driving Safety Assessment

• Short trips: You can drive a few miles to a repair shop, but avoid high‑speed highways.
• Wet or slippery roads: ABS and traction‑control are disabled, so braking distances increase dramatically.
• Steep descents: Use engine braking and keep a larger following distance.
• Resetting the code without repair: This only masks the problem and can cause a sudden loss of braking control if the sensor fails completely.

Treat the vehicle as limited‑function until the sensor is repaired.

Preventive Maintenance Tips

• Inspect the sensor during regular tire rotations; look for cracks in the tone‑wheel.
• Clean the sensor with a non‑abrasive brush if you notice brake‑dust buildup.
• Apply dielectric grease to the connector pins after cleaning to prevent corrosion.
• Avoid deep potholes whenever possible; impact damage is a common cause of tone‑wheel failure.
• Schedule a brake‑system check every 12 000 mi or after any major collision.

Make‑Specific Fixes for C0055

Toyota (Camry, Corolla, RAV4)

Toyota models from 2015‑2022 often experience sensor failure because the plastic sensor housing cracks after repeated heating cycles. Replacing the sensor typically costs $45–$60 for the part, and a dealer will charge $120–$150 for labor. Some owners report that cleaning the connector resolves the issue without a full sensor swap.

Honda (Accord, Civic, CR‑V)

Honda vehicles built between 2016‑2021 commonly suffer corroded connector pins due to road‑salt exposure. A thorough cleaning with contact cleaner often restores function. If a new connector is needed, the part runs $25–$35 and labor is about $80 at an independent shop.

Ford (F‑150, Ranger, Explorer)

Ford trucks frequently encounter a broken tone‑wheel after hitting curbs. Re‑machining the wheel hub is rarely practical; replacing the sensor assembly (including tone‑wheel) is recommended. Parts range from $70–$90, and labor is roughly $150 at a reputable independent shop.

Chevrolet (Silverado, Colorado, Tahoe)

Chevy models are prone to wire harness chafing where the sensor cable rubs against the suspension bracket. Inspect the harness for wear and apply a protective sleeve. A new harness segment costs about $40, and labor is around $100.

Related DTCs You Might Encounter

• C0040 – Right Front Wheel Speed Sensor Circuit Malfunction – Similar issue on the front‑right wheel.
• C0045 – Left Front Wheel Speed Sensor Circuit Malfunction – Front‑left sensor problem.
• C0050 – Left Rear Wheel Speed Sensor Circuit Malfunction – Mirrors the right‑rear fault on the opposite side.

Understanding these codes helps you diagnose whether the problem is isolated to one sensor or part of a larger wiring issue.

When to Call a Professional

• Persistent code after sensor replacement – the ABS module may need re‑programming or the internal circuit could be damaged.
• Damaged wiring inside the axle housing – requires special tools and possibly axle disassembly.
• ABS warning light flashes rapidly after the fix – indicates a possible brake‑system hydraulic fault that needs a certified brake technician.

If any of the above situations apply, schedule an appointment with a qualified ABS specialist.

Final Thoughts

The C0055 code is a clear indicator that the right‑rear wheel speed sensor isn’t communicating with the ABS control module. While the issue is often a simple sensor or connector problem, ignoring it compromises vital safety systems. using these steps, most DIY‑oriented owners can resolve the fault in under an hour and restore full ABS functionality. Keep an eye on the sensor during routine maintenance, and you’ll reduce the chance of the code resurfacing.

Related Chassis Abs codes

• C0035 Code — Left Front Wheel Speed Sensor Circuit Malfunction — Diagnosis
• C0040 Code: Right Front Wheel Speed Sensor Circuit Malfunction — Diagnosis
• C0045 Code – Left Rear Wheel Speed Sensor Circuit Malfunction (2026 Guide)
• C0050 Code: Rear Wheel Speed Sensor Circuit Malfunction — Diagnosis & Repair
• C0561 Code: System Disabled Information Stored — Diagnosis & Fix Guide (2026)