I have a 2006 3500 Diesel. The truck has an edge programmer and S&B Cold Air Intake. Truck has 59,000 miles.

I have noticed a lack of towing power on hills. Transmission service has been done, fuel filter is new, truck seems fine in 3 & 4th gears but diminished power in 1st and 2nd when towing a 10,000lb trailer.

RPM's will go up to around 2,800 - 3,000 but speed stays around 45 mph until I get to the top of the hill and the transmission shifts. Hills aren't an issue if I can get up speed before going up. Only seems like it lacks power when starting at the bottom.

Anyone have any ideas what should be checked? Seems to have ample power without pulling a load. Figured this truck shouldn't grunt with a 10,000lb trailer.

 

had. this problem on my 2008 3500, also had engine light come on with po242f turbo b curcuit high voltage. but it resolved itself and haven,t had any problems since.
no mod,s of any kind on vehicle.