Wheel Speed Sensor Input Signal - Erratic/Invalid
The wheel speed sensor is sending a signal that isn’t consistent with expected values.
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)
Inside the ABS system, the wheel speed sensor monitors the speed of each wheel and sends this data to the computer. If one wheel is spinning differently than expected, like if you're going straight but one wheel thinks it's turning, it throws this code.
What the computer is actually seeing
The ABS control module detects erratic signals from the wheel speed sensors, indicating a discrepancy in wheel speeds that could affect braking performance.
What a healthy reading looks like
Wheel speed sensors should report RPMs that vary smoothly and linearly based on vehicle speed; expected values are around 0-1000 RPMs while moving.
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.
- 1Inspect the wheel speed sensor wiring and connectors for damage or corrosion.
- 2Check for any stored DTCs along with C0315 that may indicate which wheel sensor is faulty.
- 3Test the output voltage of the wheel speed sensor while the vehicle is in motion; expected output is 0-5 V with a clean sine wave pattern.
- 4Compare readings from all wheel speed sensors—differences over 5-10% between sensors can indicate an issue.
Common causes
- Faulty wheel speed sensor
- Dirty or damaged sensor wiring
- Faulty ABS control module
- Wheel bearing issues affecting sensor function
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not advisable as it can affect ABS functionality, especially in slippery conditions.
Will this code come back after clearing?
If the issue is present, it will generally return. Fix the underlying problem first.
Why does this code show up with other codes?
Codes can be interrelated, especially with ABS systems; one sensor's failure can cause others to report issues.
Working a real vehicle right now?
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