cwert87

I just scanned my truck and i just pulled up P0121 nd P0236. I know P0121 has something to do w/ the throttle position sensor o the VP. I just don't know which? I also know that P0236 has something to do w/ the turbo. Does this mean my turbo is going bad? Thanks for your help

Captain Coop

ya you are right about the 121. Its the TPS (APPS). Mine did the same thing. As for the 236 I have no idea but thats not sayin much ha.

AggieJustin

P0121 is the APPS voltage too low.

P0236 is the MAP sensor signal being too high for too long. Generally this is an overboost code. What module are you running that is handling your boost fooling? It may not be working right and the ECM is seeing the higher than stock boost pressures.

cwert87

All i have is a bully dog torque dog. And i have the silencer ring taken out of the turbo, and i also have a elbow on my wasgate to let more air in for more boost. could that be causing the P0236? I dn't know cause i have had it on there for about 3yrs now.

AggieJustin

The elbow is letting the turbo exceed the factory set wastegate pressure, but the Torque Dog should be altering the MAP sensor voltage seen by the ECM so that no codes are set. The Torque Dog may be acting up and not clipping the voltage properly or it might have just been a freak one time occurrence. If you have a way to clear the codes, clear them out and see if it shows back up.

cwert87

I have a scanner, so i have tried to clear them w/ it. But 5min later i get the dead pedal and the codes just come back up

cwert87

ok, i've been looking on blue chip diesel website. They have acceleration pedal position switch 4 175.00. And if i was reading it right, i would fix my tps by getn this apps switch,right?? some insite would be helpful, thanks

AggieJustin

If you're looking at this on the Blue Chip site:

http://www.bluechipdiesel.com/shopping2_i9873225.html

That should be what you need to fix the APPS code. As for the P0236 code, did it come back just after starting and idling? Or did you take it for a drive? If it happened after a drive, did you push the boost past 20psi on your test run?

cwert87

Well it comes on not even a mile down the road, but if i clear and just let it idle, its fine. thank ys so much for the help

AggieJustin

I would try pulling the Torque Dog off and see if the P0236 code still shows up. Since it's plugged into the MAP sensor, you need to rule that out before you go looking for other solutions. If it still shows up, then you may need to look at the MAP sensor. If it's fine with the Torque Dog off, then there may be something wrong in the box that is sending invalid readings.

RowJ

I just bgt one HERE
This replacement sensor has fixed many bad APPS units on this web site.
Over 600 sold and only two returned...according to member Timbo1 (switch developer). Those two were replaced for free.

RJ