I've had a significant loss in hp and terrible fuel mileage. I took a code reading before i unplugged my bullydog and didn't get the code 0237 until after i unplugged my programmer. Is this just a map sensor problem or is there anything else i should check out?

 

From my info I have with my code reader a P0237 is a Turbocharger Boost Sensor A Circuit Low. Now your guess is as good as mine as to the fix or the problem. Hope this helps a bit.

 

i replaced the map sensor $100 and it fixed the problem

 

where did you find the sensor for 100 bucks?

 

huckstorf diesel in franklin, wisconsin. their number there is 414-421-7222. John Huckstorf is the owner and hes a great guy he'll hook you up with whatever you need and can pretty much tell you whats wrong with you're truck over the phone