Join Date: Oct 2012
Location: Batten Roodje
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Likely grid heater relay.
Have a load test done on your batteries to make sure itís not a phantom code being thrown by low voltage to be sure though. Have a good look at your grounds and crossover cable while youíre at it. The ECM is very sensitive to voltage fluctuations which can lead to all sorts of random codes popping up from the ECM getting confused.
Might also be worth tracking down a bus schematic as our trucks read multiple sensors on the same channels (example: the channel Iíve had problems with reads IAT, MAP, MAF, and turbo speed sensor inputs) so a code for one sensor could be that or it could be the ďodd man outĒ on that channel.
Iíve never personally heard of a grid heater burning out and the 3rd gen trucks arenít prone to grid heater grounding issues (like the 4th gen trucks with the bolt falling off). Not that the grid heater itself couldnít be bad but Iíve not run across one.
Are you stock or deleted? Ever removed your intake elbow and taken a look at the grid? Could conceivably be caked nearly solid allowing a short but I would think boost pressure would keep it blown clean enough to avoid that. Mine was like 160k miles of nasty but it was working fine still when it fell off last fall.
Hope this helps. Good luck!
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08 Resistol. Emissions cleaning pending. Anarchy EFI, Sinister coolant filter, Carbonite DP sensor, CSS -2"/+400# springs, reverse level, Amsoil bypass filter, and a pile of boxes in the garage
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