Some 2014-2016 Jeep Grand Cherokee and 2014-2018 RAM 1500 vehicles equipped with 3.0L diesel engines may have been manufactured with crankshaft tone wheels that could experience magnetic signal material delamination.
The magnetic material attached to the tone wheel provides a signal to the crankshaft position sensor. If this material delaminates, the engine will lose its ability to synchronize injector pulses and cam timing. Loss of crankshaft position can result in an engine stall and the inability to restart. The problem can occur without prior warning.
The remedy for this condition is not currently available. Dealers will stop the engine from stalling by updating the powertrain control module software to maintain vehicle propulsion by reading the camshaft position signal in the event that the crankshaft position signal is lost. If tone wheel failure occurs, the engine warning light will illuminate but the vehicle will not stall.
The recall to update the powertrain control module software is expected to begin in October. FCA’s number for this recall is W58 and the NHTSA campaign number is 20V-475.