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TuningBot DTC Database · v4.37.14

U028B Lost Communication With Active Grille Air Shutter Module C

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

U · NetworkNetworkOBD2

What U028B means

U028B
Lost Communication With Active Grille Air Shutter Module C Generic · network Data confidence 65%

The control module stopped receiving expected network messages from the Active Grille Air Shutter Module C node on the vehicle communication bus.

Symptoms

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

Possible causes

  • CAN bus wiring fault (open, short, chafed harness)
  • Faulty control module loading the bus
  • Connector or terminal corrosion
  • Power supply or ground fault of a module

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

U02 range
U0200U0201U0202U0203U0204U0205U0206U0207U0208U0209U020AU020BU020CU020DU0210U0211U0212U0213

How to read U028B

U

Network: communication between control units.

0

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

28B

Specific fault index within the subsystem.

Frequently asked questions about U028B

What does U028B mean?

Lost Communication With Active Grille Air Shutter Module C. The control module stopped receiving expected network messages from the Active Grille Air Shutter Module C node on the vehicle communication bus.

Is U028B generic or manufacturer-specific?

U028B is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove U028B 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 U028B is removable in your case.

Other file services

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