MasterTuning Fault code dictionary (DTC)

P0404 — EGR: control circuit range/performance

Severity: Warning Can you drive? Yes, no known limitation Make: All makes (OBD-II standard)
MeaningThe valve position read by the ECU does not match the commanded one. The electrical circuit is there, but the valve moves poorly or does not reach its target.
FamilyPowertrain (P)

Typical symptoms

Engine warning light on
Rough running at low revs
Reduced power

Common causes

Carboned valve moving in steps
Worn electric motor
Dirty position sensor
Corroded connector

What to do

Clean first, then run an actuation test on the diagnostic tool: if the valve still does not follow the command when clean, the fault is in the motor or built-in sensor and the unit is replaced.

Frequently asked questions

What does code P0404 mean?

EGR: control circuit range/performance. The valve position read by the ECU does not match the commanded one. The electrical circuit is there, but the valve moves poorly or does not reach its target.

Can I keep driving with code P0404 active?

Yes, no known limitation

Common causes — P0404

Carboned valve moving in steps Worn electric motor Dirty position sensor Corroded connector

How do you fix code P0404?

Clean first, then run an actuation test on the diagnostic tool: if the valve still does not follow the command when clean, the fault is in the motor or built-in sensor and the unit is replaced.

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