Error code

OBD2 P0501

OBD2P0501
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Vehicle Speed Sensor 'A' Range/Performance.

Severity

moderateCan drive but may experience reduced functionality and safety features.

Summary

P0501 indicates that the Vehicle Speed Sensor (VSS) 'A' is not functioning correctly in terms of range or performance. This sensor is crucial for various vehicle systems including transmission operation, cruise control, and stability control.

Symptoms

  • Automatic transmission shifts too harshly, early, or late
  • Cruise control does not work
  • Electronic stability control and anti-lock brakes may be disabled
  • Speedometer and odometer may not function properly
  • Engine power may be limited

Common Causes

  • Faulty VSS or VSS circuit
  • Broken gear in the transmission or differential
  • Excessive metal flakes on the reluctor ring of the VSS

Diagnosis

  1. Check the circuit between ECM and VSS for proper resistance values
  2. Test the VSS signal with a multimeter while rotating wheels slowly

Fixes

  • Replace faulty VSS or repair broken gear in transmission/differential

FAQ

What systems are affected by P0501?

Systems like automatic transmission, cruise control, stability control, and speedometer may be impacted.

How do I test the VSS circuit?

Check for 0 Ω resistance between ECM and VSS, and ensure proper voltage readings when ignition is on.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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