I got two DTC's, P0100, U0106 this evening after restarting my tuck from leaving a restaurant. Truck was warm and had been running fine all day, my glow plug light on my dash does not light up even when cold since the codes have showed up. Its been in the 20s lately. I disconnected the batteries for 30mins and reconnected them with no results. I downloaded my stock file back with no results. I have now download the H&S programming back and now have DTC's U0074, and P0100, the glow plug communication code "U0106" is no longer showing up. I have checked the wiring on the tuner, the glow plug module, and mass air sensor. I cant find any issues. The truck starts and drives fine other than the DTC's. Any ideas?

 

I have been over this wiring harness with a fine tooth comb and have come up empty. I will be ordering a glow plug control module tomorrow, its $185. I wish my autoenginuity worked on a 2013...

 

P0100 - Mass Or Volume Air Flow A Circuit <TABLE border=1 cellSpacing=0 cellPadding=3><TBODY><TR><TH vAlign=bottom align=middle> </TH><TH vAlign=bottom align=middle> </TH><TH vAlign=bottom align=middle> </TH><TH vAlign=bottom align=middle> </TH><TH vAlign=bottom align=middle> </TH></TR><TR><TD style="BORDER-RIGHT: medium none" vAlign=top align=left>Description: </TD><TD style="BORDER-LEFT: medium none" vAlign=top colSpan=4 align=left>The powertrain control module (PCM) continuously monitors the mass air flow (MAF) sensor for concerns. The MAF sensor is monitored for a low sensor period. If the sensor period changes below a minimum calibrated limit for greater than 1.5 seconds, the DTC sets. </TD></TR><TR><TD style="BORDER-RIGHT: medium none" vAlign=top align=left>Possible Causes: </TD><TD style="BORDER-LEFT: medium none" vAlign=top colSpan=4 align=left>

• Open MAF sensor element

</TD></TR><TR><TD style="BORDER-RIGHT: medium none" vAlign=top align=left>Diagnostic Aids: </TD><TD style="BORDER-LEFT: medium none" vAlign=top colSpan=4 align=left>The presence of this DTC may indicate that the vehicle is operating in derate mode and may experience a loss of power. </TD></TR><TR><TD style="BORDER-RIGHT: medium none" vAlign=top align=left>Application </TD><TD style="BORDER-LEFT: medium none" vAlign=top align=left> </TD><TD vAlign=top align=middle>Key On Engine Off </TD><TD vAlign=top align=middle>Key On Engine Running </TD><TD vAlign=top align=middle>Continuous Memory </TD></TR><TR><TD style="BORDER-RIGHT: medium none" vAlign=top align=left>All </TD><TD style="BORDER-LEFT: medium none" vAlign=top align=left> </TD><TD vAlign=top colSpan=3 align=middle>GO to Pinpoint Test J . </TD></TR></TBODY></TABLE>


U0074 - Control Module Communication Bus B Off
<TABLE border=1 cellSpacing=0 cellPadding=3><TBODY><TR><TH vAlign=bottom align=middle> </TH><TH vAlign=bottom align=middle> </TH><TH vAlign=bottom align=middle> </TH><TH vAlign=bottom align=middle> </TH><TH vAlign=bottom align=middle> </TH></TR><TR><TD style="BORDER-RIGHT: medium none" vAlign=top align=left>Description: </TD><TD style="BORDER-LEFT: medium none" vAlign=top colSpan=4 align=left>This DTC is set when the controller area network (CAN) between the powertrain control module (PCM) and data link connector (DLC) is open. </TD></TR><TR><TD style="BORDER-RIGHT: medium none" vAlign=top align=left>Possible Causes: </TD><TD style="BORDER-LEFT: medium none" vAlign=top colSpan=4 align=left>

• Communication error

</TD></TR><TR><TD style="BORDER-RIGHT: medium none" vAlign=top align=left>Diagnostic Aids: </TD><TD style="BORDER-LEFT: medium none" vAlign=top colSpan=4 align=left>The presence of this DTC may indicate that the vehicle is operating in derate mode and may experience a loss of power.
Network DTC concerns occur during module-to-module communication. For additional description and operation of the vehicle communication network, refer to the Workshop Manual Section 418-00, Module Communications Network. </TD></TR><TR><TD style="BORDER-RIGHT: medium none" vAlign=top align=left>Application </TD><TD style="BORDER-LEFT: medium none" vAlign=top align=left> </TD><TD vAlign=top align=middle>Key On Engine Off </TD><TD vAlign=top align=middle>Key On Engine Running </TD><TD vAlign=top align=middle>Continuous Memory </TD></TR><TR><TD style="BORDER-RIGHT: medium none" vAlign=top align=left>All </TD><TD style="BORDER-LEFT: medium none" vAlign=top align=left> </TD><TD vAlign=top colSpan=3 align=middle>GO to Pinpoint Test AE . </TD></TR></TBODY></TABLE>

U0106 - Lost Communication With GPCM <TABLE border=1 cellSpacing=0 cellPadding=3><TBODY><TR><TH vAlign=bottom align=middle> </TH><TH vAlign=bottom align=middle> </TH><TH vAlign=bottom align=middle> </TH><TH vAlign=bottom align=middle> </TH><TH vAlign=bottom align=middle> </TH></TR><TR><TD style="BORDER-RIGHT: medium none" vAlign=top align=left>Description: </TD><TD style="BORDER-LEFT: medium none" vAlign=top colSpan=4 align=left>The powertrain control module (PCM) continuously monitors the controller area network (CAN) for messages from the glow plug control module (GPCM). This DTC sets when the PCM receives invalid data from the GPCM. </TD></TR><TR><TD style="BORDER-RIGHT: medium none" vAlign=top align=left>Possible Causes: </TD><TD style="BORDER-LEFT: medium none" vAlign=top colSpan=4 align=left>

• Communication error

</TD></TR><TR><TD style="BORDER-RIGHT: medium none" vAlign=top align=left>Diagnostic Aids: </TD><TD style="BORDER-LEFT: medium none" vAlign=top colSpan=4 align=left>Check for other PCM DTCs or PCM related symptoms. Diagnose all other PCM DTCs or PCM related symptoms first. </TD></TR><TR><TD style="BORDER-RIGHT: medium none" vAlign=top align=left>Application </TD><TD style="BORDER-LEFT: medium none" vAlign=top align=left> </TD><TD vAlign=top align=middle>Key On Engine Off </TD><TD vAlign=top align=middle>Key On Engine Running </TD><TD vAlign=top align=middle>Continuous Memory </TD></TR><TR><TD style="BORDER-RIGHT: medium none" vAlign=top align=left>All </TD><TD style="BORDER-LEFT: medium none" vAlign=top align=left> </TD><TD vAlign=top colSpan=3 align=middle>GO to Pinpoint Test AE . </TD></TR></TBODY></TABLE>

Seems like a wiring issue to me....

 

I agree, I pulled the wiring harness out and visually inspected it after checking it with a meter. I spent all saturday tearing my truck apart checking it and reassembling everything. Everything points to a wiring problem but I just cant find it. So im going to take a $185 gamble because its either replace the module or the harness, and the module is cheaper.

 

Over the weekend I received the U0074 and U0407 code. I tried to clear the codes but the U0074 continues to return.
Did you replace the Glow Plug Realy or the Glow Plug Controller?
When you replaced the part, did that correct the issue?
I have not had any issues with this truck when I was in Arizona and as soon I moved to Minnesota I blew out the intercooler boot and now this occurs.

Thank you,