Chrysler is recalling certain Ram trucks equipped with a gasoline engine and cruise control. Included are 2014-2018 1500/2500/3500 pickup trucks and 3500 /4500/5500 Cab Chassis and 2016-2018 3500 10K Cab Chassis trucks, built from Oct.31, 2017, through Nov. 22, 2017.
The fault handling strategy of the PCM software may not remove positive torque requests from the engine controller. The CAN-C bus may stop communicating while the cruise control is requesting positive torque.
In the instance of a short in the vehicle causing the CAN-C bus to stop communicating while the cruise control is active and the vehicle speed is below the set speed such that the cruise control system is requesting positive torque at the exact moment of the short, it is possible for a positive torque request to be locked on the PCM which may result in either the vehicle maintaining its current speed or possibly accelerating. If the driver does not shift to neutral or apply the brakes to stop the vehicle, this condition can cause a vehicle crash without warning.
Inspect the software level of the PCM and if necessary, reprogram the PCM. The PCM must be at the latest software calibration level.