Wheel Speed Sensor Circuit Failure
Indicates a failure in the wheel speed sensor circuit.
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 vehicle’s computer is trying to get information from the wheel speed sensors to help with traction control and ABS, but it’s not getting the right signals due to a circuit issue.
What the computer is actually seeing
The computer expects a pulsing signal based on wheel rotation, typically 0-5 volts. It might see a constant voltage, zero voltage, or erratic signals instead.
What a healthy reading looks like
During normal operation, the wheel speed sensor should output a signal around 0-5 volts, fluctuating rapidly based on wheel speed.
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 wheel speed sensor wiring for damage; repair as needed. Decision: Is the wiring intact? If yes, go to step 2. If no, repair the wiring.
- 22. Inspect the connector at the wheel speed sensor for corrosion or damage; clean or replace if necessary. Decision: Is the connector good? If yes, go to step 3. If no, fix the connector.
- 33. Measure the voltage at the wheel speed sensor connector with the key on, engine off. Expect around 5 volts. Decision: Is the voltage present? If yes, go to step 4. If no, check circuit back to the module for opens/shorts.
- 44. With the vehicle in motion, verify the sensor output signal with a scan tool. Look for a fluctuating signal that matches wheel speed. Decision: Is the signal present? If yes, the wheel speed sensor is good; if no, replace the sensor.
Common causes
- Wiring issues (broken or shorted wires)
- Faulty wheel speed sensor
- Corroded or damaged connectors
- Poor ground connection
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with C0690 code?
It's moderate severity; you can drive but should fix it soon as it affects ABS and traction control.
Will the issue come back after I clear the code?
If the underlying cause is not fixed (like a bad sensor or wiring issue), it will likely return.
Why does this code pair with others?
Wheel speed issues often affect multiple systems, leading to multiple codes for related sensors.
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 →