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DTC Codes

1K views 6 replies 3 participants last post by  Pops 
#1 ·
Haven't been here in a while but in need of some information, so here goes.
My 08 has thrown a couple of codes ----

P 406 Exhaust gas recirculation sensor A high

P 1404 EGR temperature sensor circuit ??

Truck runs fine but have noticed a reduction in fuel mileage

Any thoughts or suggestions would be great..

Thanks

Pops
 
#2 ·
Those codes usually set from an egr valve that is sticking open and the temp sensor is picking up that there is flow when there shouldn't be

Also while this is happening the PCM is constantly trying to correct a lean condition caused by the egr valve being stuck open hence waisting fuel
 
#3 ·
Thanks for the answer---where is the EGR valve located
 
#5 ·
Changed it yesterday---thanks for your help---it took me about 1 hour, I could have done this in 20 mins, about 10 years ago. At least I could do it.
 
#6 ·
Yep, i feel your pain pops. Esp. when it gets cold.
 
#7 ·
Question for you---did you rebuild the transmission yourself or have it done
I don't have any problems yet with the 08, but have had the transmission rebuilt in the 04 at 171k miles.
 
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