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DTC P0501: Vehicle Speed Sensor #1 Performance (Auto Trans): Testing

  1. Ensure that the pinion factor has been programmed and the correct tire size has been programmed in before continuing. Ignition on, engine not running. With the DRBIII® scan tool, read PCM DTCs and record the related freeze frame data. Is the Good Trip displayed and equal to zero? If yes, go to next step. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn the ignition on. With the DRBIII® scan tool, check the transmission DTCs. Are there any transmission DTCs present? If yes, diagnose transmission related DTCs. See DIAGNOSIS article in AUTOMATIC TRANSMISSIONS. If no, before continuing disconnect the PCM harness connector and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING .
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