The P0644: Driver Display Serial Communication Circuit code indicates an issue with the serial communication circuit between the driver display and other control modules in the vehicle. This could result from a faulty serial communication circuit, wiring issues, or a malfunctioning driver display, which may lead to incorrect or missing information on the driver display panel.
P0644 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0644: Driver Display Serial Communication Circuit |
| Is it serious? | Yes, as it can prevent critical information from being displayed to the driver. |
| Possible causes | – Faulty serial communication circuit – Wiring issue – Faulty driver display |
| How to diagnose? | – Test driver display serial communication circuit – Inspect wiring and connectors – Replace driver display if necessary |
P0644 Meaning
The P0644 code indicates that there is a communication problem between the driver display and other systems in the vehicle via the serial communication circuit. This can prevent the display from showing important information such as warnings, gauges, or messages, affecting the driver’s ability to monitor the vehicle’s status.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for additional communication-related codes that might provide more context for diagnosing the display issue. | OBD-II Scanner |
| Test the Driver Display Serial Communication Circuit | Use a diagnostic tool to test the functionality of the serial communication circuit to ensure proper data transmission between the display and other modules. | Diagnostic Tool |
| Inspect Wiring and Connectors | Inspect the wiring and connectors associated with the driver display and serial communication circuit for damage, loose connections, or corrosion. | Flashlight, Multimeter |
| Test the Driver Display | Test the driver display unit to verify that it is receiving and displaying data correctly. If the communication circuit is working, the display may be faulty. | Diagnostic Tool, Multimeter |
| Replace the Driver Display if Necessary | If the driver display is determined to be faulty and is not showing information correctly, replace the display unit. | Replacement Display, Tools |
| Clear the Code and Test | After repairs, clear the code using an OBD-II scanner and test the vehicle to ensure the driver display is functioning properly and receiving data. | OBD-II Scanner, Vehicle Manual |
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I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko