OBD Guide
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P0644

Driver Display Serial Communication Circuit

P0644 is an OBD-II diagnostic trouble code meaning: Driver Display Serial Communication Circuit. Common causes: instrument panel control module (ipc/bcm) malfunction, damaged or broken data bus wiring. Estimated repair cost: $22–444.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$22–444 (est.)

Symptoms

  • Check Engine light comes on
  • Incorrect operation or no indication on the instrument panel
  • Incorrect display of data on the information display
  • Speedometer, tachometer, or other gauges may be missing
  • Possible U-codes (communication errors) in the ECU memory

Causes

  • Instrument Panel Control Module (IPC/BCM) malfunction
  • Damaged or broken data bus wiring
  • Lost contact in data bus connectors
  • Interference in the power supply or ground circuit of the control units
  • ECU malfunction

How to Fix

  1. Read all codes, especially U codes (network errors)
  2. Check the power and ground of the instrument panel control unit
  3. Inspect the data bus connectors (CAN/LIN) for damage
  4. Check the data bus signals with an oscilloscope
  5. Check for firmware updates for the ECU and instrument panel unit
  6. If the unit is faulty, replace or reprogram

Related codes

U0073U0100U0155P0600P0601

Error P0644 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0644 code mean?

P0644 is an OBD-II diagnostic trouble code that indicates: Driver Display Serial Communication Circuit

What causes a P0644 error code?

The most common causes of P0644 include: Instrument Panel Control Module (IPC/BCM) malfunction; Damaged or broken data bus wiring; Lost contact in data bus connectors; Interference in the power supply or ground circuit of the control units.

How do I fix a P0644 diagnostic trouble code?

To fix P0644: Read all codes, especially U codes (network errors). Check the power and ground of the instrument panel control unit. Inspect the data bus connectors (CAN/LIN) for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0644?

Do not drive — repair immediately

How much does it cost to fix P0644?

The estimated repair cost for P0644 is $22–444. Actual cost depends on your vehicle, location, and labor rates.

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