I have a dodge grand caravan 2006 with trouble codes p0126 and p0406 what does that mean? and how can I fix it?

Hi, sorry I don't have a manual for your van but here is some general information for these codes.

P0126 Insufficient Coolant Temperature for Stable Operation:

basically, the engine is running cool. Check your thermostat to see if it's closing properly. If it is closed when removed, you may want to get a higher temp thermostat. The thermostat is usually in a housing bolted to the engine at the end of the upper radiator hose.


P0406 Exhaust Gas Recirculation Sensor A Circuit High:

This indicates the EGR position sensor signal is out of range. The problem could be the wiring or the sensor itself. Check the wiring first. If it looks good, consider replacing the sensor. I think in your van the sensor may be integrated into the EGR valve itself.

EGR valve:

PO126 is coolant temperature too low. I would suspect the thermostat is stuck open. Drain and flush the cooling system and replace the thermostat. Refill with a 50/50 mix of antifreeze and distilled water. PO406 may go away when you replace the thermostat.