Monday, June 16, 2025

SPN: 639 FMI: 3

SPN: 639 
FMI: 3
Description: This code indicates a fault in the transmission pressure sensor circuit. The sensor is reporting voltage outside the expected range. Solution: 1. Check sensor wiring for damage 2. Test sensor resistance (should be 1000-1500 ohms at 25°C) 3. Verify connector pins are clean and tight 4. Replace sensor if faulty
Sensor location diagram

SPN: 639 FMI: 3

SPN: 639  FMI: 3 Description: This code indicates a fault in the transmission pressure sensor circuit. The sensor is reporting voltage outsi...