Keffer inc Posted April 10, 2017 Share Posted April 10, 2017 I've got MID 144, PSID 40, FMI 4. According to the Mack help line, this is saying "Sensor Power Supply is showing low voltage" so I ask my truck experts, where do I look. I think this is what makes my truck act like it has a mid fire and then smooths out after 30 miles of driving. The truck ran pretty good Friday and turns out, that code was gone but came back again. Where should I look or what connection should I clean? Quote Link to comment Share on other sites More sharing options...
Mackpro Posted April 10, 2017 Share Posted April 10, 2017 What's the last 6 of the vin and model number, that code is not coming up on my list. Quote Link to comment Share on other sites More sharing options...
Keffer inc Posted April 10, 2017 Author Share Posted April 10, 2017 Vin 014634 model CXU613 Quote Link to comment Share on other sites More sharing options...
Mackpro Posted April 10, 2017 Share Posted April 10, 2017 Finally found it, your daytime running light relay is probably missing or bad(DRL) Quote Link to comment Share on other sites More sharing options...
Mackpro Posted April 10, 2017 Share Posted April 10, 2017 Quote Link to comment Share on other sites More sharing options...
j_martell Posted April 10, 2017 Share Posted April 10, 2017 Weird....i have a 2011 GU without DRL (i pulled the relay 4 years ago, got sick of replacing low beam bulbs) and its never thrown a code.... Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment Share on other sites More sharing options...
Keffer inc Posted April 10, 2017 Author Share Posted April 10, 2017 LOL, Well now I feel stupid. I pulled the DRL relay because I didn't want to get pulled at scales if a light goes out. I plugged it in for a few minutes while looking for something wrong and the code was gone, I figured I did something else to "fix" the issue. As for the misfire, I guess the injectors are just old, 718,000 miles on them assuming they are original. Thanks for the help. Quote Link to comment Share on other sites More sharing options...
Keffer inc Posted April 10, 2017 Author Share Posted April 10, 2017 That's it though, I plugged it back in and code is gone. Now I need to find $5,000 for injectors. Quote Link to comment Share on other sites More sharing options...
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