hi i am new to this post and i think i can get a better response from here but on with it i have a 96 6.5 2500 i started to get the code p0236 i did have an exhaust leak at the driver side manifold flange its gettin fixed tommorow could this be setting it off or is it the wastegate it only does it after driving for awhile or driving real hard for a short period of time thanks

Most likely a wastegate solenoid IMO. My crossover pipe completly blew off the passenger side about 1 year ago, I drove the truck for a week before my replacement arrived. Even while driving with clouds of black soot pouring out the back it never once popped a p0236 code! It would only build about .5 PSI of boost floored.

I went through 2 solenoids in 1 year, then finally moved to the mechanical Turbo Master from Heath Diesel.

Welcome to the 'Place Josh..........

Go thru the Diagnostics Checklist for better idea of cause and effect - copy and post the list and your results.

Wastegate is controlled by vacuum, so the cvac pump must be functional -
25" at idle and 2000rpm - WG is 15" at idle

P0236 is usually over-Boost

could a bad fuel filter cause the truck to trigger this code? i was told by my local parts store it could thanks

When I cracked my crossover I got a code 78 (equal to an OBD II 236)....it was a big enough crack that I lost all of my boost.....how bad is your exhaust leak?

found out the problem fuel filter and air filter clogged with mud simple things i overlooked thanks for the help