P0501 Code - Vehicle Speed Sensor 'A' Range/Performance

What Does P0501 Mean?

The PCM has detected a vehicle speed sensor reading that does not coincide with the wheel speed sensor readings of the ABS system. This malfunction could include a higher than normal reading, lower reading, or an erratic reading.

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What are the common causes of P0501 ?

• The VSS output voltage jumps up or down faster than the ECM expected causing the ECM to determine the VSS is out of specification range for performance.
• The VSS voltage output is lower than expected causing a lower than normal speed output compared to actual vehicle speed.

How do you troubleshoot P0501 ?

If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector.

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