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TuningBot DTC Database · v4.37.15

U02A5 Lost Communication With Reductant Heater Control Module

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

U · NetworkEmissionsOBD2

What U02A5 means

U02A5
Lost Communication With Reductant Heater Control Module Generic · emissions Data confidence 65%

The control module stopped receiving expected network messages from the Reductant Heater Control Module node on the vehicle communication bus.

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
U02A1U02A2
U02 range
U0200U0201U0202U0203U0204U0205U0206U0207U0208U0209U020AU020BU020CU020DU0210U0211U0212U0213

How to read U02A5

U

Network: communication between control units.

0

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

2A5

Specific fault index within the subsystem.

Frequently asked questions about U02A5

What does U02A5 mean?

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

Is U02A5 generic or manufacturer-specific?

U02A5 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove U02A5 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 U02A5 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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