Hi, I have a 2006 silverado ext cab 4x4, Truck originally had a l33 engine, I have swapped in a 2003 lq9 with a comp 212/218 high lift camshaft. The truck also has the stock 5.3 exhaust system from front to back.

I have been getting this code recently, P2001 NOX Trap efficiency below threshold bank 2.

Only things I can think of are, Exhaust system is too restrictive and causing backpressure issues which is tripping this code, Or one the cat's is clogged.

Rear 02's have been deleted. Truck seems to run fine, has 3.42 gears so no super powerful off the line.

Any insight or experience with this code??

Thanks

 

Anyone anyone? Bueller?

 

Are you sure about that code #? Alldata doesn't list that code for that vehicle and opening up a 2006 truck file with HP Tuners it's not in the DTC list either.

 

That's a Daimler/Chrysler (Mercedes/Dodge coproduction, think Sprinter) code. I doubt you would find that on a GM vehicle. Maybe use a different scan tool?