So yesterday morning I went to start my dodge for the first time in over a week. Let the grid heater cycle 2 times and tried to start it.  Wouldn't start so I unhooked the quad from the battery but not the map (forgot that part). Jumped the truck and had a cel. Drove to my brother's next door to change the turbo. Got that done and went for a drive. Had zero boost checked the cel and it was a p0238, 0236. 

Unhooked the quad at the plug, left the quad map sensor is plugged and same results.  Drove like a turd and no boost. (Limp mode if I can describe it).  

Did I fry the map or the quad?  Should I unhook the quad map sensor and plug in the factory one?   

 

Thanks! 

So I unplugged the map sensor connector for the quad plugged the original back in to the map sensor and left the rest of the quad connected still drove like a trud.  I didn't clear the code but I don't think that matters on these correct?

I would try removing the quad completely to return the truck to stock configuration and take it if a test drive.  If it seems better, then I would look at what is wrong with the quad.  If its still gutless then maybe take a look at the turbo install.  There might be a massive leak somewhere.  Do you have an actual boost gauge or are you just using what the Quad says?

Just the quad is the only way I have to watch boost now.  It sounds like it's making some boost. Just no extra fuel being added. I'll try taking the quad off completely. Can I just unhook the plug from the quad or do I need to unhook it from the batteries and data link?

Edited January 15, 20232 yr by Unreal Summit

you should be ok just to remove the plug from the module.

Thanks gonna try this now 

No change. 

What kind of turbo, and what was in it before you changed turbos?

Fenely 60/67/12.  Did have a hy35.  Turbo leak wouldn't cause a p0237 and p0238 and p0236 would it?  I had the cel light before changing turbos right after jump starting the truck 

That probably from having the quad module disconnected. Did you clear the code? What size injectors?

7x9 Ducky's. Did not clear the code before changing turbo. However Same code came back with the quad disconnect and connected. 

Get your quad connected and clear the code see if it comes back. What time are you running? Same tune as always or new tune since the turbo swap?

I cleared the code last night and hooked it back up and no change.

 

I've tried the new tune and old. Quad on level zero and 7 no change.  Quad reads everything else just not showing any boost building.  Of the stock plug on the map sensor isn't making it feel any different Its making me lean towards map sensor but just not sure. 

So you’re saying you cleared the code after you reconnected the quad and the code came back? you won’t get boost fooling without the quad connected. I’d return everything to the way it was (quad) and try it on level 3. I don’t know what custom tunes you have made for 7, but 3 will at least get you a little more fuel and boost  fooling. If that doesn’t work I’d be checking for leaks. Hopefully you didn’t get a bad turbo. 

The truck thinks it's making zero boost according to the quad and throwing a code p0237.  Does not matter what level I have the quad on or if the quads disconnected. I can hear the turbo making boost.  The issue in my mind has to be the quad or the map sensor. 

Is your oil pressure sensor connected to anything?

Using it as my transmission temperature sensor. 

Edited January 15, 20232 yr by Unreal Summit

Is the trans temp showing correctly? 

Yes everything on the quad is showing correctly. 

I’d just check the map sensor/harness connection, make sure it’s solid and clean. Of course swapping in a new map sensor would at least confirm or eliminate that issue. Or start testing the wiring harness and looking for bad grounds. Also, what year is your truck? 

2002

Cleared the codes again and it comes back as soon as I start the truck. No quad hooked up at all. P0237