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TuningBot DTC Database · v4.37.15

U04B6 Invalid Data Received From Catalyst Heater Control Module

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

U · NetworkEmissionsOBD2

What U04B6 means

U04B6
Invalid Data Received From Catalyst Heater Control Module Generic · emissions Data confidence 65%

The control module registered the fault condition described as "Invalid Data Received From Catalyst Heater Control Module".

Symptoms

  • MIL illuminated
  • Possible smell of unburnt fuel or reduced performance in severe cases

Possible causes

  • Aged or damaged catalytic converter
  • Downstream oxygen sensor fault giving a wrong efficiency reading
  • Exhaust leak
  • Misfire or mixture fault overloading the catalyst

Recommended checks

  • Compare upstream and downstream oxygen sensor signals
  • Check for exhaust leaks
  • Check for stored misfire or mixture codes first
  • Verify catalyst temperature plausibility where available

Related and nearby codes

U04 range
U0400U0401U0402U0403U0404U0405U0406U0407U0408U0409U040AU040BU040CU040DU040EU040FU0410U0411

How to read U04B6

U

Network: communication between control units.

0

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

4B6

Specific fault index within the subsystem.

Frequently asked questions about U04B6

What does U04B6 mean?

Invalid Data Received From Catalyst Heater Control Module. The control module registered the fault condition described as "Invalid Data Received From Catalyst Heater Control Module".

Is U04B6 generic or manufacturer-specific?

U04B6 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove U04B6 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 U04B6 is removable in your case.

Other file services

Stage 1/2/3 TuningDPF RemovalEGR RemovalAdBlue / SCR RemovalDTC RemovalIMMO OFFSpeed Limiter (Vmax)

Understand the system behind this code: Oxygen Sensors (Lambda)

ECU tuningDyno-tested results by model and engine See the results →

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