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Chrysler Town & Country 2009 P0404 and P0406 Error After EGR Valve Replacement

Model: EGR valve replaced Fault Code: P0404 Posted: 2016-04-07 13:41

After replacing the EGR valve, the engine warning light initially disappeared. However, after driving approximately 2,000 km, the vehicle returned with DTCs P0404 (Exhaust Gas Recirculation Circuit Range/Performance) and P0406 (Exhaust Gas Recirculation Sensor A Circuit High). The issue persists despite the EGR valve replacement. Please advise on potential root causes or further diagnostic steps for this 2009 Chrysler Town & Country with a 4.0L engine.

Related fault codes

P0404P0406

Comments (2)

Anonymous 2016-04-07 14:59

A common misconception is that replacing a component automatically resolves the issue — in reality, diagnostics must identify the root cause. Code P0404 and P0-406 do not simply indicate a faulty part; they point to performance or sensor issues within the EGR system. For accurate troubleshooting, please provide your vehicle's full specifications: year, make, model, engine size, and transmission. This will help in offering targeted advice on possible fixes.

Anonymous 2016-05-15 17:19

The P0406 code specifically indicates a high signal from the EGR position sensor A. In your case, with a 2009 Chrysler Town & Country equipped with a 4.0L engine, this could suggest issues such as a faulty EGR position sensor, clogged EGR passages, or incorrect wiring. Even after replacing the EGR valve, these underlying system problems may still trigger the fault codes. Further inspection of the sensor and associated components is recommended.