This applies to 2015-2018 RAM ProMaster City vehicles equipped with a 2.4L engine. Customers may experience a warning light on. This may be accompanied by rough running and diagnostic trouble code (DTC) P0300 (multiple cylinder misfire), P0301 (cylinder 1 misfire), P0302 (cylinder 2 misfire). P0303 (cylinder 3 misfire) and/or P0304 (cylinder 4 misfire).

Clean the area around all coils. Remove the ignition coils.

Remove the boot from the offending coil. The boot seat on the coil bottom flange should be free of debris. Clean as needed.

Use part cleaner Mopar 04318040AC to prepare the coil surface. Use at air temperature and allow to air dry. 

Ensure that the spring is inside each new boot.

Assemble the boot onto the coil by pushing/turning until fully seated. A light popping sound may be heard.

Place a small 360-degree bead of only Mopar Molykote G-5008 lube along the inside opening of the coil boot, about 1-2mm from the chamfered edge but not on the chamfered surface.

Reinstall the coils.

Clear any faults and verify that all four boots are replaced.

Start the engine and allow the engine to run for at least 60 seconds. If the engine runs rough and/or the check engine light comes on, further diagnosis will be required.