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WC IL | I had a DEF fault code on a 2012 that about drove me crazy. Didn't go into limp mode, but partially derated it and only allowed 10 lbs. of boost. Mine turned out to be the wiring harness going to the engine, the cab mounts had sagged just enough to let the harness rub and it wore through one of the wires. I think the code on mine was the DEF purge valve.
I had to replace the insert twice on that truck, once for a bad heater and once for a faulty gauge. Both of mine were warranty. | |
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