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TuningBot DTC Database · v4.38.5

U012B Lost Communication With Chassis Control Module B

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

U · NetworkNetworkOBD2

What U012B means

U012B
Lost Communication With Chassis Control Module B Generic · network Data confidence 65%

The control module stopped receiving expected network messages from the Chassis Control Module B 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

U01 range
U0100U0101U0102U0103U0104U0105U0106U0107U0108U0109U010AU010BU010CU010DU010EU010FU0110U0111

How to read U012B

U

Network: communication between control units.

0

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

12B

Specific fault index within the subsystem.

Frequently asked questions about U012B

What does U012B mean?

Lost Communication With Chassis Control Module B. The control module stopped receiving expected network messages from the Chassis Control Module B node on the vehicle communication bus.

Is U012B generic or manufacturer-specific?

U012B is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove U012B 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 U012B is removable in your case.

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