Vehicle Speed Sensor Malfunction
What does P0500 mean?
The P0500 code means the vehicle's onboard diagnostic system has detected: Vehicle Speed Sensor Malfunction. This is a serious severity code.
Common Symptoms
- Speedometer not working or erratic
- ABS and traction control warning lights may come on
- Transmission shift problems
- Check Engine Light on
Probable Causes (Ranked by Likelihood)
- Failed vehicle speed sensor (VSS) Very High
- Damaged tone ring or reluctor wheel Moderate
- Wiring fault to VSS Moderate
- Faulty instrument cluster (speedometer head) Low
Step-by-Step Diagnostic Procedure
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Monitor vehicle speed on a live data scan while driving. If it reads zero or erratically, the sensor or its circuit is faulty.
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Locate the VSS (on the transmission or at the wheel). Test resistance on magnetic sensors: 200-900 ohms.
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Inspect wiring for damage, especially near the transmission where heat and vibration cause insulation breakdown.
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Check the tone ring for bent or missing teeth.
Frequently Asked Questions
Can I drive with a bad vehicle speed sensor?
Yes, carefully. The engine will still run, but the transmission may not shift correctly (may stay in a fixed gear or shift erratically), ABS may be disabled, and cruise control will not work. Avoid highway driving until repaired.