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C0077moderate severity✨ AI-generated

Wheel Speed Sensor 2 Performance

Indicates a problem with the performance of the second wheel speed sensor.

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 second wheel speed sensor is not sending proper signals, so the computer can't tell how fast that wheel is turning properly.

What the computer is actually seeing

The ABS control module expects the signals from the wheel speed sensors to vary based on wheel rotation; when it detects that the output is outside of the expected range, it triggers this code.

What a healthy reading looks like

Wheel speed should match vehicle speed within 5% and should be consistent across all four sensors.

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.

  1. 1Inspect wiring and connectors for damage or corrosion, focusing on the harness connected to wheel speed sensor 2. Check for continuity and proper voltage (usually 5V reference).
  2. 2Clear the code and perform a road test. Monitor the live data for wheel speed while driving; ensure sensor 2 is providing a signal that matches the others within 5% during a straight-line test.
  3. 3If the wheel speed sensor 2 is reading incorrectly or not at all, replace the sensor and retest. If the issue persists, check the ABS module and wiring further.

Common causes

  • Faulty wheel speed sensor 2
  • Damaged wiring or connectors to the speed sensor
  • Faulty ABS control module
  • Wheel bearing issues affecting sensor function

Typical repair cost

$$$

Related codes

Frequently asked questions

Can I still drive the vehicle with this code?

Yes, but with potential ABS or traction control issues; the vehicle is drivable but may have reduced braking performance in slippery conditions.

Will this code come back after clearing?

It may come back if the underlying issue is not resolved, like a faulty sensor or wiring problem.

Why did this code trigger with issues in the other wheel speed sensor?

If one sensor fails, it can affect the ABS system's ability to properly manage braking, potentially causing issues in other sensors during diagnostics.

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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