1)<TABLE border=0 cellSpacing=0 cellPadding=0 width="80%" align=center><TBODY><TR style="HEIGHT: 12.75pt" height=17><TD style="HEIGHT: 12.75pt" height=17>P0238</TD><TD>Turbo Boost Sensor A Circuit High Input</TD></TR></TBODY></TABLE>
2)<TABLE border=0 cellSpacing=0 cellPadding=0 width="80%" align=center><TBODY><TR style="HEIGHT: 12.75pt" height=17><TD style="HEIGHT: 12.75pt" height=17>P0472</TD><TD>Exhaust Back Pressure Sensor Circuit Low Input</TD></TR></TBODY></TABLE>
3)<TABLE border=0 cellSpacing=0 cellPadding=0 width="80%" align=center><TBODY><TR style="HEIGHT: 12.75pt" height=17><TD style="HEIGHT: 12.75pt" height=17>P0473</TD><TD>Exhaust Back Pressure Sensor Circuit High Input</TD></TR></TBODY></TABLE>
4)<TABLE border=0 cellSpacing=0 cellPadding=0 width="80%" align=center><TBODY><TR style="HEIGHT: 12.75pt" height=17><TD style="HEIGHT: 12.75pt" height=17>P0670</TD><TD>Glow plug Control Circuit Error</TD></TR></TBODY></TABLE>
5)<TABLE border=0 cellSpacing=0 cellPadding=0 width="80%" align=center><TBODY><TR style="HEIGHT: 12.75pt" height=17><TD style="HEIGHT: 12.75pt" height=17>P0684</TD><TD>Glow Plug Control Module to PCM Communication Circuit Range/Performance</TD></TR></TBODY></TABLE>
6)<TABLE border=0 cellSpacing=0 cellPadding=0 width="80%" align=center><TBODY><TR style="HEIGHT: 12.75pt" height=17><TD style="HEIGHT: 12.75pt" height=17>P0731</TD><TD>Gear One Ratio Error</TD></TR></TBODY></TABLE>
Mileage went way down hill from around 16 to around 11-12 mpg and power is still down


1) I have a boost fooler... maybe its not working.......?
2+3) Bad sensor maybe?
4) I have no idea where to start
5)No idea......
6) Im at a complete loss with that....
HHHHEEEELLLLPPPPP and thanks

 

I have no experience on this at all, still new to these trucks and codes.

1) I have a boost fooler... maybe its not working.......?
2+3) Bad sensor maybe?
4) I have no idea where to start
5)No idea......
6) Im at a complete loss with that....
HHHHEEEELLLLPPPPP and thanks

But that part was great. People will be to your rescue very shortly im guessing.

 

I guess you have a CA truck? Have you cleared the codes and see what comes back after a quick drive?

 

Clear all, drive for about 30 miles and report again...

 

Pin8246, thanks I know where to come for help, these guys never let anyone down

I have a canadian truck........

1) This code seems to always be stored in the truck evertime I look its there, I dont think its a ghost code
2+3) Would it make more sence to clean it or buy another one because I have cleaned it and the tube and its still there
6) I hope its a ghost code I just had the trans rebuilt.....
I have cleared the codes then parked the truck for the night.

Leading up to the SES light coming on I put the truck in my 120 tune and got on it about mid way to the floor from a 20mph rolling start and let off around 45-50, at first I thought it was a dumb over boost code that would go off a couple mins later.... but nope threw it on the scanner and you see what I got

 

What code reader are you using? In a 120 setting while getting on it, I would have expected a P1211 code if the light came on for a while and then went away after a few minutes.

 

I haven't pulled the trigger on AE yet so I just ran up to orileys and used there's. That's just it usually it goes away after about a min or two but this time it didn't so I knew well enough to go read whatever codes it threw. I wasn't on it hard at all

 

I'd ignore the codes you saw at Oreilly's. If AE isn't in the cards right now, watch craigslist for a used edge or superchips or something that can pull codes that might sell for dirt cheap.

 

I was just reading up on the gpcm. What I got from it was you either have a gpcm or a relay? I wired up a led to my rely not to long ago and it lights up everytime I go to fire it up, except when it's already warm. Make this make sence to me and thank you for all your help again guys

 

Do you have two relays in the valley or one relay and a 3"x4" box?

 

I'll be looking to see what I have under there tonight if I reach right it's just one relay... Maybe.
Would the first code I listed be because I deleted the WG?

 

Could be, but with your MAP regulator it should not see high boost.

One relay means there should be the box under there, which means you have a GPCM...

Not sure why you would have a GP LED hooked up to the IAH relay, more confused as to why it would light up at every key on... LOL

 

Me too. Only thing I can figure would be the LED wire going to the key on post instead of the voltage out post.

 

There is 2 relays, I have it hooked up right. No gpcm... Weird...... The truck does have a hard start issue only when it's really cold out. I haven't checked the glow plugs yet but I'll be replacing them before winter. When I put the new starter and solenoid on it the other day the starts were faster than they ever were before, then when I cleared the codes it went right back to slower starts

 

Why not disconnect your tunes and see what shows up and compare to codes with the tunes. This might provide some indication of the problem area.