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TuningBot DTC Database · v4.37.15

U05A9 NOx Sensor C Received Invalid Data From ECM/PCM

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

U · NetworkEmissionsOBD2

What U05A9 means

U05A9
NOx Sensor C Received Invalid Data From ECM/PCM Generic · emissions Data confidence 65%

The control module registered the fault condition described as "NOx Sensor C Received Invalid Data From ECM/PCM".

Symptoms

  • MIL or SCR/AdBlue warning illuminated
  • Possible start-count-down or torque limitation on some applications

Possible causes

  • Reductant quality or level fault
  • Dosing valve or supply module fault
  • NOx sensor fault
  • Frozen or crystallized reductant lines
  • Wiring or connector fault

Recommended checks

  • Read NOx sensor values and dosing system status
  • Check reductant level and quality data
  • Inspect dosing valve, lines and heater operation
  • Check wiring and connectors of the SCR components
  • Check for OEM technical bulletins and software updates

Related and nearby codes

Related codes
U05A1U05A2U05A3U05A6U05A8
U05 range
U0501U0502U0503U0504U0505U0506U0507U0508U0509U050AU050BU050CU050DU050EU0511U0512U0513U0514

How to read U05A9

U

Network: communication between control units.

0

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

5A9

Specific fault index within the subsystem.

Frequently asked questions about U05A9

What does U05A9 mean?

NOx Sensor C Received Invalid Data From ECM/PCM. The control module registered the fault condition described as "NOx Sensor C Received Invalid Data From ECM/PCM".

Is U05A9 generic or manufacturer-specific?

U05A9 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove U05A9 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 U05A9 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: SCR / AdBlue System

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

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