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TuningBot DTC Database · v4.37.15

U0644 Lost Communication With Wastegate Position Sensor A

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

U · NetworkEngineOBD2

What U0644 means

U0644
Lost Communication With Wastegate Position Sensor A Generic · engine Data confidence 65%

The control module stopped receiving expected network messages from the Wastegate Position Sensor A node on the vehicle communication bus.

Symptoms

  • Possible reduced power or limp mode
  • MIL illuminated
  • Possible abnormal turbocharger noise

Possible causes

  • Turbocharger actuator or position sensor fault
  • Sticking variable geometry mechanism
  • Charge-air or vacuum leak
  • Wiring or connector fault

Recommended checks

  • Compare specified vs actual boost with live data
  • Check actuator movement over the full range
  • Check hoses and vacuum lines
  • Inspect wiring and connectors

Related and nearby codes

U06 range
U0600U0601U0602U0603U0604U0605U0606U0607U0608U0609U060AU060BU060CU060DU060EU060FU0610U0611

How to read U0644

U

Network: communication between control units.

0

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

644

Specific fault index within the subsystem.

Frequently asked questions about U0644

What does U0644 mean?

Lost Communication With Wastegate Position Sensor A. The control module stopped receiving expected network messages from the Wastegate Position Sensor A node on the vehicle communication bus.

Is U0644 generic or manufacturer-specific?

U0644 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove U0644 at file level?

Not guaranteed. Powertrain (P) codes can be reliably disabled in the ECU calibration, but body, chassis and network codes depend on the specific control unit and how the fault is implemented - some can be handled, some cannot. Ask for a quote and our engineers will check your file and tell you, free of charge, whether U0644 is removable in your case.

Other file services

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

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