C0050 on Chevrolet: How to Diagnose & Fix
Right Rear Wheel Speed Sensor Circuit
3 Chevrolet models · 3 documented issues · $100-$1,200 repair
C0050 on Chevrolet by model: symptoms, diagnosis and fix
First-generation Avalanches (2002-2006) can experience unwanted ABS activation during normal low-speed braking. The antilock brake system activates inappropriately, causing a pulsating brake pedal and increased stopping distances when it should not be engaging. The issue is more likely in environmentally corrosive areas where corrosion builds up between the front wheel speed sensor and the hub/bearing assembly it mounts to, weakening the sensor signal. This creates a safety hazard as the vehicle takes longer to stop than expected during routine braking.
Common Symptoms
- ABS activates during normal low-speed braking
- Pulsating brake pedal when it should not be pulsating
- Increased stopping distances during routine stops
- ABS warning light illuminated on dashboard
- Grinding or buzzing noise from brakes during normal stops
How to Fix
Inspect and clean all four ABS wheel speed sensors and tone rings. Replace corroded sensor wiring or connectors. If the ABS module itself is faulty, replacement costs $600-$1,200. Applying dielectric grease to sensor connectors during brake service can prevent corrosion. In some cases, ABS module reprogramming at the dealer resolves the issue.
Sources for this issue (2)
Colorado owners frequently report ABS warning lights, stored wheel speed sensor faults, and low-speed unwanted ABS activation, especially in rust-belt trucks. Corrosion at the front hub sensor mounting area or failing hub-integrated wheel speed sensors can create an erratic signal that the ABS module interprets as wheel slip. This issue is widely documented across GM midsize trucks and often shows up as pulsation or extended stopping distance at parking-lot speeds.
Common Symptoms
- ABS light on
- brake pedal pulsation at low speed
- unwanted ABS activation
- traction control light on
- longer stopping distance
- intermittent wheel speed sensor codes
How to Fix
Scan the EBCM for wheel speed sensor data and compare all four wheel speeds during a slow stop. If one front sensor drops out, inspect the hub bearing assembly, sensor wiring, and corrosion under the sensor mounting surface; many repairs involve replacing the front hub assembly and cleaning the mounting area. If multiple communication or module faults are present, the ABS module and grounds should also be checked.
Sources for this issue (3)
The wheel speed sensors and their wiring are prone to failure due to the harsh commercial-use environment, causing the StabiliTrak and ABS systems to falsely activate during normal driving. The ABS unexpectedly engages during normal braking, extending stopping distances. The tone rings on the hub bearings also corrode.
Common Symptoms
- StabiliTrak warning light
- ABS activating during normal braking
- Traction control light on
- Speedometer fluctuating
- Extended braking distances
How to Fix
Scan for specific wheel speed sensor codes to identify which corner has failed. Replace the faulty wheel speed sensor and inspect the tone ring for corrosion or damage. Clean the sensor mounting area and apply anti-corrosion compound. If the hub bearing is original, replace the entire hub assembly for a fresh tone ring.
Sources for this issue (2)
C0050 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does C0050 mean on a Chevrolet?
C0050 stands for "Right Rear Wheel Speed Sensor Circuit." This is a brake/ABS-system code. The right rear wheel speed sensor reports how fast that wheel spins so the anti-lock brake, traction control, and stability systems can do their job. C0050 means the ABS module detected an electrical fault in the right rear wheel speed sensor circuit — an open, short, or an erratic/out-of-range signal. This usually turns on the ABS and traction/stability warning lights and may disable those features, though standard braking remains available. On Chevrolet it is documented across 3 models: Avalanche, Colorado, Express.
What are the most common causes of C0050?
The most common causes of C0050 are: Failed right rear wheel speed sensor, Damaged, corroded or disconnected sensor wiring/connector, Damaged or rusty tone/reluctor ring (missing or clogged teeth), Excessive air gap between sensor and tone ring, Wheel bearing wear affecting an integrated sensor, Moisture or corrosion in the connector, Faulty ABS control module (less common). The specific cause varies by vehicle.
How much does it cost to fix C0050 on a Chevrolet?
Published repair estimates on Chevrolet range from $100 to $1,200 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for C0050 on a different make?
View C0050 across all makes →Join 700+ subscribers following Au7o for vehicle insights and updates.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.