Left Front Wheel Speed Sensor Circuit Range/Performance Problem
The left front wheel speed sensor is reporting an out-of-range signal.
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 spinning, but it's sending a signal that doesn't match what the computer expects, usually because of a wiring issue or the sensor itself.
What the computer is actually seeing
The ECU expects the wheel speed signal to vary between 0 volts (at zero speed) and around 5 volts (at max speed). If it sees a constant signal (like 0 volts or greater than 5 volts), it triggers the code.
What a healthy reading looks like
Expect wheel speed sensor output between 0.5V (1 mph) and 4.5V (greater than 60 mph).
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 at the left front wheel speed sensor. Look for frays, corrosion, or loose connections. | Decision: Are the wiring and connectors intact?
- 22. Measure the resistance of the left front wheel speed sensor with a multimeter. Expect around 1,000 to 2,500 ohms. | Decision: Is the sensor resistance within range?
- 33. Using a scan tool, monitor the wheel speed sensor data while moving the vehicle. Watch for a smooth signal as wheel speed increases. | Decision: Does the sensor report the correct speed?
- 44. If still faulty, test the sensor output voltage while spinning the wheel. It should vary between 0.5V and 4.5V. | Decision: Is the output voltage across that range?
- 55. If all checks are okay, inspect the tone ring for damage or debris. Clean or replace as necessary.
Common causes
- Faulty left front wheel speed sensor
- Damaged wiring or connectors
- Wheel bearing issues affecting sensor operation
- Corrosion or dirt on the sensor or tone ring
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's drivable, but you'll lose ABS and traction control, increasing stopping distances.
Will the code come back after clearing?
If the underlying issue isn't fixed, the code is likely to return soon.
Why does this code come with other codes?
Often, multiple wheel speed sensors operate in sync; issues can affect their performance simultaneously.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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