C0041 Code: Right Front Wheel Speed Sensor Range or Performance

What the C0041 code means

The ABS module (EBCM) controls the anti-lock brakes and, on most modern vehicles, traction control and stability control too. When it detects a fault, it disables those functions and turns on the ABS and stability warning lights. The normal brakes keep working.

Each wheel has a sensor that measures its speed by reading a toothed or magnetic ring on the hub or axle shaft. The C0041 code refers to the right front wheel. A range fault is usually caused by rust or metal shavings on the sensor or the ring, a cracked ring, a bearing with play or tires of different sizes.

This kind of fault is rarely solved with a multimeter, because electrically everything looks correct. You have to compare what the part reports with reality, using a gauge, a thermometer, a tachometer or by commanding the component with the scan tool and watching whether the physical result matches the order.

Important: many C and B codes are not generic. The definition on this page is the most widespread one, used by General Motors and most generic scan tools, but on other makes the same number can mean something else. Always confirm the code text with a scan tool that reads the right module (ABS, body or airbag).

A quick check: lift the vehicle, turn the wheel by hand with the scan tool connected and see whether a speed shows up for that wheel. If nothing appears, the problem is electrical (sensor or cable). If it appears but drops out now and then, look at the ring and the bearing play.

C0041 code symptoms

• ABS and stability control warning lights on.
• The ABS does not act, or acts at low speed when it is not needed.
• An erratic speedometer on some vehicles.
• Cruise control may be disabled.

Likely causes of the C0041 code

1. Rust or metal shavings on the sensor or the ring. The most common cause.
2. Damaged toothed or magnetic ring. It is often built into the bearing.
3. Bearing with play. It changes the distance to the sensor.
4. Tires of different sizes or with very uneven wear. The wheel turns at a different speed and the module reads that as a fault.
5. Sensor not seated properly after brake work.

How to diagnose the C0041 code step by step

1. Read the speed of all four wheels on the scan tool while driving slowly in a straight line. They should match.
2. Inspect the cable and connector along their whole length, especially around the suspension.
3. Remove the sensor and clean its tip and its bore.
4. Check the ring for broken teeth, cracks or rust.
5. Passive sensor: measure the resistance. A typical figure is 800 to 2,000 ohms.
6. Active sensor: check the supply from the module and the signal with the scan tool.
7. Turn the wheel by hand with the scan tool connected. A low, steady speed should appear.

How to fix the C0041 code

• Clean the sensor and the ring.
• Repair the cable or the connector.
• Replace the sensor, or the bearing if the ring is built into it.
• Clear the codes and confirm on a road test that the warning light goes out.

Technical reference data

• Passive sensor: 800 to 2,000 ohms.
• Active sensor: current signal of roughly 7 and 14 mA.
• These values are approximate. Check the manufacturer data for your vehicle.

Brand-specific notes

If the C0041 code appeared right after brake or bearing work, suspect a sensor that was knocked or not seated properly before looking at anything else.

C0041 on Toyota, Honda, Hyundai and Chevrolet

On many vehicles from these makes the magnetic ring is built into the wheel bearing. If the bearing is installed backwards, the sensor cannot read it.

Frequently asked questions about C0041