Wheel Speed Sensor Input Signal Failure
The ABS control module isn't getting valid input from a wheel speed sensor.
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What it means (plain English)
The car's computer relies on signals from wheel speed sensors to determine how fast each wheel is spinning. If one of these sensors isn't working, the computer can't make the right decisions, potentially affecting brakes and traction control.
What the computer is actually seeing
The ABS controller expects to see a consistent signal from the wheel speed sensors, usually a pulsed voltage between 0.5 to 5 volts depending on wheel speed. If it sees intermittent or no signal, it triggers this code.
What a healthy reading looks like
Normal operating voltage for a functioning wheel speed sensor should be around 0.5 to 1.5 volts at rest, rising to up to 5 volts as the wheel speed increases.
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. Check the wiring and connector at the affected wheel speed sensor for damage or corrosion. If found, repair or replace as necessary. Decision: If wiring is okay, proceed to next step.
- 22. Inspect the wheel speed sensor for proper installation and any physical damage. Confirm that the sensor is properly seated. Decision: If sensor looks good, proceed to next step.
- 33. Measure the output voltage of the wheel speed sensor while the wheel is spun manually. You should see a fluctuating voltage signal. Decision: If no voltage signal, replace the wheel speed sensor. If voltage is present, proceed to the next step.
- 44. Test continuity of the wiring harness between the ABS module and the wheel speed sensor. Use a multimeter to ensure that the wiring has no breaks. Decision: If continuity is lost, repair the wiring. If continuity is intact, consider the ABS module may be faulty.
Common causes
- Damaged wiring or connector to the wheel speed sensor
- Faulty wheel speed sensor itself
- Issues with the ABS control module
- Mechanical binding in the wheel bearing or hub assembly
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive without proper wheel speed sensor input as it may disable ABS and traction control functions, increasing stopping distances.
Will this problem come back after fixing?
If the root cause is addressed, such as repairing the wiring or replacing the faulty sensor or module, the issue shouldn’t return.
Why is this code paired with other C14xx codes?
C14xx codes usually involve different wheel speed sensors or related ABS faults, often indicating a systemic issue within the braking system.
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