Emissions / AuxiliaryLow ImpactDiesel

P0406 — Diagnostic Trouble Code P0406

OBD-II diagnostic code P0406 relates to the emissions / auxiliary system. This code is logged when the ECU detects a parameter outside its expected operating range.

5+

Affected Brands

10+

ECU Platforms

2

Related Services

4

Related DTCs

Symptoms

What the driver typically experiences when P0406 is stored

!Check Engine Light
iFailed emissions test
iNo major drivability impact

Why does P0406 appear after tuning?

This code may appear after ECU modifications when the affected system monitoring has not been fully recalibrated for the new operating parameters.

How proper calibration can address P0406

WEREMAP professional calibrations include comprehensive diagnostic management for all affected systems, preventing unnecessary fault codes while maintaining safe operation.

Related Tuning Services

Relevant services for the system behind P0406

EGR OffDTC Off

Related Diagnostic Codes

Codes from the same diagnostic system as P0406

P0405Low Impact

EGR Position Sensor Circuit Low

P0401Low Impact

Exhaust Gas Recirculation (EGR) Flow Insufficient

P0407Low Impact

Diagnostic Trouble Code P0407

P0408Low Impact

Diagnostic Trouble Code P0408

Affected ECU Platforms

Siemens/Continental SID803ADelphi DCM6.2Bosch EDC17C60Bosch EDC16V2Siemens/Continental sid202Siemens/Continental SID206Siemens/Continental SiD 206Bosch EDC17CP07Siemens SID206Siemens/Continental SID20X

Commonly Affected Vehicles

VWTransporterDelphi DCM6.2
Peugeot5008Bosch EDC17C60
VWTouaregBosch EDC16V2
FordFocusSiemens/Continental sid202
VolvoS40 / V50Siemens/Continental SID206
FordTourneo ConnectSiemens/Continental SiD 206
ToyotaiQBosch EDC17CP07

Based on data from 5+ vehicle brands. P0406 is not limited to these models.

Frequently Asked Questions

What does P0406 mean?â–¼
OBD-II diagnostic code P0406 relates to the emissions / auxiliary system. This code is logged when the ECU detects a parameter outside its expected operating range.
Why does P0406 appear after ECU tuning?â–¼
This code may appear after ECU modifications when the affected system monitoring has not been fully recalibrated for the new operating parameters.
How do you prevent P0406 during remapping?â–¼
WEREMAP professional calibrations include comprehensive diagnostic management for all affected systems, preventing unnecessary fault codes while maintaining safe operation.
Which vehicles are affected by P0406?â–¼
P0406 is commonly found on VW, Peugeot, Ford, Volvo, Toyota vehicles equipped with Siemens/Continental SID803A, Delphi DCM6.2, Bosch EDC17C60, Bosch EDC16V2 ECU platforms.
What other codes appear alongside P0406?â–¼
P0406 frequently appears together with P0405, P0401, P0407, P0408. These related codes typically originate from the same system modification and should be addressed together in the calibration.

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