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TuningBot DTC Database · v4.37.15

P0644 Driver Display Serial Communication Circuit

Generic (OBD-II) interpretation in the TuningBot DTC database.

P · PowertrainNetworkOBD2

What P0644 means

P0644
Driver Display Serial Communication Circuit Generic · network Data confidence 90%

The control module detected improper operation of the Driver Display Serial Communication circuit.

Symptoms

  • Multiple warning lamps possible
  • Functions of the affected module unavailable

Possible causes

  • Wiring
  • CAN data bus
  • ECM

Recommended checks

  • Perform a full-module scan to map which modules communicate
  • Check CAN bus resistance and voltages at the diagnostic connector
  • Inspect wiring and connectors of the affected module
  • Check module power supply and grounds
  • Disconnect suspect modules one at a time only with a documented procedure

Related and nearby codes

P06 range
P0600P0601P0602P0603P0604P0605P0606P0607P0608P0609P060AP060BP060CP060DP060EP060FP0610P0611

How to read P0644

P

Powertrain: engine, transmission and driveline systems.

0

Generic SAE-standard code: same meaning on every make.

644

Specific fault index within the subsystem.

Frequently asked questions about P0644

What does P0644 mean?

Driver Display Serial Communication Circuit. The control module detected improper operation of the Driver Display Serial Communication circuit.

Is P0644 generic or manufacturer-specific?

P0644 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove P0644 at file level?

If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.

Other file services

Stage 1/2/3 TuningDPF RemovalEGR RemovalAdBlue / SCR RemovalDTC RemovalIMMO OFFSpeed Limiter (Vmax)

Understand the system behind this code: Diagnostic Strategy and DTC Logic

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