![]() We also had a bad Bank 1 NOx sensor, which triggered another error code of P1C55, which we had already known about, but didn’t trigger the limp mode. The code reader showed an error code of P208A, Redundant DEF Pump “A” Control Circuit Open. The tech told us that our truck needed a new Diesel Exhaust Fluid (DEF) pump, a repair that would cost $1,797 ($480 in parts $1,317 in labor). The news from the service center wasn’t good. Fortunately, we were within 100 miles from our destination when we got the warning, so we were able to get it to a service center before it went into this so-called “protective” mode. It also forces you to sometimes call a tow truck. ![]() Engineered to prevent further damage to your vehicle, the limp mode forces you to see a dealership because 5 mph isn’t a safe speed to drive anywhere, city or highway. The alarm on the dashboard read, “5 mph Max Speed in 100 mi, Service DEF System, See Dealer.” If this has never happened to you, it sucks. Our Ram 3500 Cummins 6.7L truck went into the dreaded “limp mode” on a recent trip here in Arizona. ![]()
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