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TuningBot DTC Database · v4.37.15

U0293 Lost Communication With HVAC control unit

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

U · NetworkNetworkOBD2

What U0293 means

U0293
Lost Communication With HVAC control unit Generic · network Data confidence 65%

The control module stopped receiving expected network messages from the HVAC control unit 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 U0293

U

Network: communication between control units.

0

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

293

Specific fault index within the subsystem.

Frequently asked questions about U0293

What does U0293 mean?

Lost Communication With HVAC control unit. The control module stopped receiving expected network messages from the HVAC control unit node on the vehicle communication bus.

Is U0293 generic or manufacturer-specific?

U0293 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove U0293 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 U0293 is removable in your case.

Other file services

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