EGR / EmissionsLow ImpactDiesel

P0403 — Exhaust Gas Recirculation (EGR) Control Circuit

Electrical fault detected in the EGR valve control circuit.

5+

Affected Brands

9+

ECU Platforms

2

Related Services

6

Related DTCs

Symptoms

What the driver typically experiences when P0403 is stored

!Check Engine Light
iNo drivability impact

Why does P0403 appear after tuning?

Can appear after EGR modifications if the electrical drive signal is not properly managed.

How proper calibration can address P0403

WEREMAP EGR-off files include proper EGR valve driver deactivation to prevent electrical fault codes.

Related Tuning Services

Relevant services for the system behind P0403

EGR OffDTC Off

Related Diagnostic Codes

Codes from the same diagnostic system as P0403

P0405Low Impact

EGR Position Sensor Circuit Low

P0401Low Impact

Exhaust Gas Recirculation (EGR) Flow Insufficient

P0400Low Impact

Exhaust Gas Recirculation Flow

P0407Low Impact

Diagnostic Trouble Code P0407

P0409Low Impact

Diagnostic Trouble Code P0409

P0402Low Impact

Diagnostic Trouble Code P0402

Affected ECU Platforms

Bosch EDC17C79Siemens/Continental PCR2.1Siemens/Continental SID208Bosch EDC17C42Bosch EDC16C31Bosch EDC16C39Delphi DCM6.2Bosch MD1CP002Delphi DCM3.7

Commonly Affected Vehicles

MazdaBT-50Siemens/Continental SID208
VWTransporter / MultivanDelphi DCM6.2
DodgeRamBosch EDC17C79
BMW5 SerieBosch MD1CP002
VWCaddySiemens/Continental PCR2.1
SkodaOctaviaSiemens/Continental PCR2.1

Based on data from 5+ vehicle brands. P0403 is not limited to these models.

Frequently Asked Questions

What does P0403 mean?â–¼
Electrical fault detected in the EGR valve control circuit.
Why does P0403 appear after ECU tuning?â–¼
Can appear after EGR modifications if the electrical drive signal is not properly managed.
How do you prevent P0403 during remapping?â–¼
WEREMAP EGR-off files include proper EGR valve driver deactivation to prevent electrical fault codes.
Which vehicles are affected by P0403?â–¼
P0403 is commonly found on Mazda, VW, Dodge, BMW, Skoda vehicles equipped with Bosch EDC17C79, Siemens/Continental PCR2.1, Siemens/Continental SID208, Bosch EDC17C42 ECU platforms.
What other codes appear alongside P0403?â–¼
P0403 frequently appears together with P0405, P0401, P0400, P0407, P0409. These related codes typically originate from the same system modification and should be addressed together in the calibration.

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