Wheel Speed Sensor Signal Correlation Fault
This code indicates a problem with the wheel speed sensor signals not matching expectations.
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 computer expects the wheel speed sensors on all four wheels to send similar data as the vehicle moves. If one sensor is sending a different signal, it could mean it's damaged or not connected properly.
What the computer is actually seeing
The ABS control module monitors the voltage signals from each wheel speed sensor. For instance, a good sensor might output around 0.5 to 1.5 volts at rest and around 5 volts at high speed. The module compares these signals to ensure they're consistent. If one sensor reports significantly different values, the module sets this code.
What a healthy reading looks like
Wheel speed sensors should output voltages between 0.5V to 3V at low speeds and can go up to 5V at high speeds. Any inconsistencies or values outside this range indicate a fault.
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 wheel speed sensors for damage or corrosion. Repair any issues found. Decision: Is wiring intact? Yes: Go to step 2. No: Repair wiring and retest.
- 22. Measure the voltage output from each wheel speed sensor while the vehicle is at rest. Expected is between 0.5V to 1.5V. Decision: Are all readings within range? Yes: Go to step 3. No: Replace the failed sensor and retest.
- 33. Take the vehicle for a test drive while monitoring the wheel speed sensor outputs with a scan tool. They should all increase together. Decision: Are the outputs consistent? Yes: Clear codes and monitor. No: Check for a faulty ABS control module.
Common causes
- Faulty wheel speed sensor
- Damaged wiring or connectors to the sensor
- Problems with the ABS control module
- Misalignment of the wheel sensor
- Brake fluid contamination affecting sensor
- Corrosion or dirt buildup on connectors
Typical repair cost
$$
Related codes
Frequently asked questions
Can I still drive my vehicle with this code?
Yes, but be cautious as brakes may not function optimally due to ABS issues.
Will this code come back after I clear it?
It may, especially if the underlying issue is not resolved.
Why does this issue sometimes pair with C1550?
C1550 also deals with wheel speed sensors, typically indicating multiple sensor faults.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →