What does code P1404 mean on Isuzu vehicles?
The ECU detects that the EGR valve is stuck in the closed position, preventing exhaust gas recirculation.
OBD-II Code Isuzu
P1404 — Isuzu — EGR Valve Stuck Closed
The ECU detects that the EGR valve is stuck in the closed position, preventing exhaust gas recirculation.
Common symptoms
- Elevated NOx emissions
- possible pinging
Possible causes
- Faulty or stuck EGR valve
Initial recommendation
Clean or replace the EGR valve and inspect passages.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine Isuzu code P1404 with your vehicle's actual symptoms for more complete diagnostic guidance.
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