TM and 238 [Archive] - Diesel Place : Chevrolet and GMC Diesel Truck Forums

: TM and 238


Joe Palmer
02-08-2009, 08:46 PM
I have installed a TM and gauge. I disconnected the vac lines at W/G solenoid & plugged the holes to the solenoid. When pulling away rather gently from a stop sign I get 3psi boost. I also throw a 236 code. Is this normal & if so will a 10K resistor or pot solve this problem. If not what could be causing this code at very little boost

BlueBurby1
02-08-2009, 09:42 PM
anytime the computer senses something out of spec in the boost sytem it will throwq a 236-238 code. you need to fool the system to think its still hooked up

Joe Palmer
02-08-2009, 10:11 PM
anytime the computer senses something out of spec in the boost sytem it will throwq a 236-238 code. you need to fool the system to think its still hooked up

Will a resistor or pot solve that problem? Or does that only work with "S" engines?

Torque454
02-08-2009, 11:24 PM
its not normal as long as you left the electrical connection hooked up to the solenoid. You should not get any codes, even without the 10k pot.