Code 42 - Noise On Vehicle Speed Sensor Input: Description

PCM detects vehicle speed by counting pulses from Vehicle Speed Sensor (VSS). PCM can detect incorrect input signals (noise) by comparing input value to normal data in memory. PCM sets code 42 if VSS input is incorrect or if VSS indicates vehicle speed is greater than 15 MPH.

1. This step checks for connector problems at PCM.
2. This step checks PCM for internal problems.
3. This step checks for connector problems at VSS.
4. This step checks each circuit for any visual problems.
5. This step lists other possible causes of code 42.