C0040 on Chevrolet
Right Front Wheel Speed Sensor Circuit
C0040 on Chevrolet vehicles indicates right front wheel speed sensor circuit. Au7o has documented this code across 7 Chevrolet models — most commonly on Avalanche, Cobalt, Colorado. This is a brake/ABS-system code. The right front wheel speed sensor measures how fast that wheel is rotating and feeds that data to the anti-lock brake, traction control, and stability control systems. C0040 means the ABS module found an electrical problem in the right front wheel speed sensor circuit — for example an open circuit, a short, or a signal that is missing or out of range. You'll normally see the ABS and traction/stability lights come on, and those systems may shut off temporarily while your regular brakes keep working. Typical repair costs on Chevrolet range from $100 to $1,200, depending on the specific model and root cause.
Common Causes of C0040
- •Failed right front wheel speed sensor
- •Damaged, corroded or unplugged sensor wiring/connector
- •Damaged or rust-clogged tone/reluctor ring
- •Excessive air gap between sensor and tone ring
- •Wheel bearing wear affecting an integrated sensor
- •Water intrusion or corrosion at the connector
- •Faulty ABS control module (less common)
C0040 on Chevrolet by Model
Chevrolet Avalanche(1 issue)
- Unwanted ABS Activation Increasing Stopping Distance2002-2006
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 road salt deteriorates the ABS wheel speed sensor wiring and tone rings. This creates a safety hazard as the vehicle takes longer to stop than expected during routine braking.
Chevrolet Cobalt(1 issue)
- Premature Front Wheel Hub Bearing Failure2005-2010
Front wheel hub bearings commonly fail prematurely, sometimes as early as 50,000 miles. The sealed bearing units develop excessive play and noise due to poor sealing that allows water intrusion. Road salt environments accelerate failure dramatically.
Chevrolet Colorado(1 issue)
- ABS Module / Wheel Speed Sensor Faults Causing ABS Warning and Intermittent Brake Activation2004-2012
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.
Chevrolet Equinox(1 issue)
- Front Wheel Bearing and Hub Assembly Failure Triggering ABS/Traction Warnings2005-2009
Premature front wheel bearing and hub assembly wear is a common issue on the 2005-2009 Equinox. Owners often first notice a humming or growling noise that changes with speed, followed by ABS or traction control warnings when the integrated wheel speed sensor signal becomes erratic. Because the sensor is built into the hub on many replacements, a failing hub can create both noise and brake/traction system faults.
Chevrolet Express(1 issue)
- StabiliTrak and ABS False Activation from Wheel Speed Sensors2008-2025
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.
Chevrolet Malibu(1 issue)
- Front Wheel Bearing and Hub Assembly Failure Causing Growling Noise and ABS Warning Lights2004-2007
The 2004-2007 Malibu commonly develops front wheel bearing/hub failures, often starting as a humming or growling noise that changes with speed or while turning. Because the front hub contains the wheel speed sensor, failure can also trigger ABS and traction control warnings. Owners frequently report replacing one side and then the other within a relatively short period, especially on higher-mileage cars or those driven on rough roads.
Chevrolet Silverado 1500(1 issue)
- Front Wheel Hub Bearing Failure Triggering ABS Warning and Growling Noise2000-2013
Silverado 1500 trucks commonly develop front hub bearing wear, especially on higher-mileage 4x4s and trucks used on rough roads or with oversized tires. Owners report a humming or growling noise that changes with speed and steering input, and because the wheel speed sensor is integrated into the hub assembly, ABS and traction control warnings may appear as the bearing deteriorates. Excessive play can eventually affect braking feel and tire wear.
Looking for C0040 on a different make?
View C0040 across all makes →Frequently Asked Questions
What does C0040 mean on Chevrolet?▼
C0040 stands for "Right Front Wheel Speed Sensor Circuit." This is a brake/ABS-system code. The right front wheel speed sensor measures how fast that wheel is rotating and feeds that data to the anti-lock brake, traction control, and stability control systems. C0040 means the ABS module found an electrical problem in the right front wheel speed sensor circuit — for example an open circuit, a short, or a signal that is missing or out of range. You'll normally see the ABS and traction/stability lights come on, and those systems may shut off temporarily while your regular brakes keep working. On Chevrolet specifically, this code is documented across 7 models.
What causes C0040 on Chevrolet vehicles?▼
Common causes on Chevrolet: Failed right front wheel speed sensor, Damaged, corroded or unplugged sensor wiring/connector, Damaged or rust-clogged tone/reluctor ring, Excessive air gap between sensor and tone ring, Wheel bearing wear affecting an integrated sensor. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C0040 on a Chevrolet?▼
Repair costs on Chevrolet range from $100 to $1,200, depending on the specific model and root cause.
Which Chevrolet models have C0040 documented?▼
Au7o has documented C0040 on 7 Chevrolet models: Avalanche, Cobalt, Colorado, Equinox, Express, Malibu, Silverado 1500.