Wheel Speed Sensor Left Front Circuit Failure
Left front wheel speed sensor is not providing valid signals.
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 front wheel speed sensor measures how fast the wheel is turning. If it fails, the system can't tell if the wheel is moving, which can cause uneven braking and traction issues.
What the computer is actually seeing
The computer expects a voltage signal from the left front wheel speed sensor fluctuating with wheel speed, typically around 0-5 volts depending on the design. If it sees no signal or a constant voltage, like 0 volts for a certain time, it triggers the code.
What a healthy reading looks like
Voltage expected between 0.5V (stationary) and 4.5V (moving) based on speed; Pulses expected every 0.1 seconds when functioning properly.
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 connector at the left front wheel speed sensor. Look for frayed wires or corrosion. Decision: If damaged, repair wiring/connector, clear the code, and retest.
- 22. Measure the voltage at the wheel speed sensor connector while the vehicle is moving. Expect around 0.5V to 4.5V. Decision: If voltage is absent or constant, sensor may be faulty. Replace sensor and retest.
- 33. If the sensor checks out, inspect the ABS control module connections and ensure it's receiving power and ground. Decision: If issues are found, repair connections or replace module.
Common causes
- Damaged wheel speed sensor
- Corroded or broken wiring
- Faulty connector
- Failed ABS control module
- Wheel bearing failure
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended. The braking system may not function correctly, increasing the risk of a collision.
Will the code come back after repairs?
If the underlying issue is fixed and all connections are secure, the code should not return.
Why does it pair with other wheel speed codes?
Other codes indicate issues with different wheel speed sensors, suggesting a broader issue with the ABS system.
Working a real vehicle right now?
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