ABS Wheel Speed Sensor Circuit Malfunction (Left Rear)
Error in the left rear ABS wheel speed sensor circuit.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The left rear wheel speed sensor isn't sending the right signal, so the system can't tell if that wheel is turning correctly, which could lead to unstable braking or ABS not working.
What the computer is actually seeing
The ABS control module expects to see a square wave signal from the left rear wheel speed sensor. This signal should fluctuate between 0 to 5 volts, corresponding to wheel speed. If it detects a voltage that is outside the expected range or sees no signal for over 500 milliseconds, it sets the C0298 code.
What a healthy reading looks like
Voltage from the sensor should be 0-5 volts; typical active sensor output changes with wheel speed.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the left rear wheel speed sensor wiring and connectors for damage or corrosion. If found, repair or replace.
- 22. Test the sensor output with a multimeter while the wheel is turned. Voltage should vary between 0-5 volts. If no signal is present, replace the sensor.
- 33. Check the sensor mounting for debris or misalignment; clean or align as necessary.
- 44. Clear the code and do a road test to see if the code returns. If it does, monitor wheel speed data in real-time to compare with the left rear wheel.
Common causes
- Faulty ABS wheel speed sensor
- Damaged wiring or connectors to the sensor
- Dirty or obstructed sensor
- Faulty ABS control module
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but can impact ABS performance and overall braking stability. Get it checked soon.
Will this code come back after reset?
If the underlying issue isn't fixed, yes, the code will likely return.
Why does this code show up with others?
Related codes often indicate more than one wheel sensor is affected or have similar circuit issues.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →