P0644 OBD II Trouble Code Driver Display Serial Communication Circuit

How to easily diagnose, repair, and info on causes of a P0644 trouble code that indicates a detected failure of the driver display serial communication circuit.

Symptoms of P0644 OBD II Trouble Code

  • Loss of the driver display system
  • Other stored codes

Common Causes of P0644 OBD II Trouble Code

  • Shorted or open wiring or connectors in the CAN bus
  • Defective driver display monitor
  • Blown fuse or fusible link
  • Faulty relay
  • Bad PCM or programming error

Severity of P0644 OBD II Trouble Code

This type of serial data communication code should not be accompanied by any drivability or safety issues. A code P0644 could however be associated with a loss of the driver display. This could be inconvenient but would not be classified as a severe condition.