The fix: Jeep and Ram dealerships will perform a free software update that allows the crankshaft position sensor to operate even if the tone wheel fails. This fix will be free of charge.

Your vehicle's crankshaft sensor can be, well, cranky. But it's also a key part you can't do without. So what makes one fail? And how do you know if it's bad?

80,629 units of the Ram 1500 and Jeep Grand Cherokee may stall and fail to restart due to premature delamination of the crankshaft position sensor tone wheel ...

Cars Ram 1500 and Jeep Grand Cherokee diesel face recall over stall risk Apparently, part of the 3.0-liter EcoDiesel's crank position sensor can delaminate.

Problems with a crankshaft position sensor can be complete failure, likely caused by the fine wire breaking, or a more frustrating to diagnose intermittent fault that causes the engine to cut out ...