Wheel Speed Sensor Rear Left Circuit Malfunction
There's an issue with the rear left 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 rear left wheel speed sensor isn't sending or receiving the proper signals needed for the ABS or traction control to work correctly. This could happen if the sensor is damaged or there's a problem in the wiring that connects it to the computer.
What the computer is actually seeing
The PCM expects a consistent voltage signal from the rear left wheel speed sensor, normally around 0-5 volts that fluctuates based on wheel speed. If the signal is missing or outside the expected range, it triggers the C0424 code.
What a healthy reading looks like
Voltage from wheel speed sensor should be between 0.5 to 4.5 volts during normal operation; the expected frequency at speeds over 5 mph should be approximately 2-5 Hz based on wheel rotation.
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 wiring and connectors to the rear left wheel speed sensor for damage or corrosion. If found, repair or replace as needed. Decision Point: Wiring intact? If yes, proceed to step 2; if no, fix wiring and retest.
Common causes
- Damaged wheel speed sensor
- Corroded or damaged wiring/connectors
- Dirt or debris on the sensor
- Faulty ABS module
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's advisable to fix this code soon, as it affects ABS and traction control which are critical for safety, especially in slippery conditions.
Will this code come back after clearing it?
If the underlying issue isn't fixed, yes, the code is likely to return, indicating the same sensor issue.
Why does it pair with other codes?
Other wheel speed sensor codes can appear due to similar circuit issues or faults in the ABS system affecting multiple sensors.
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