This bulletin involves 2015 Jeep Grand Cherokee vehicles, reprogramming the radio frequency hub module (RFHM) with the latest calibration. 

The typical push button start complaint is “when I push the start button, nothing happens,“ but where do we start to diagnose this complaint when the ignition won’t even turn on?

A “Key in Ignition” warning may appear on the instrument panel cluster when the key fob is not in the ignition switch/node module.

Today’s modern ignition system normally will use a single ignition coil per cylinder, mounted directly or very close to the spark plug: the Coil On Plug (COP) design. Some systems use an individual coil and a small ignition wire in a Coil Near Plug (CNP) setup because the location of the spark plug in the cylinder head won’t allow enough room to directly mount a coil on the spark plug, I consider this a version of COP.

This bulletin applies to 2015-2019 Cadillac Escalade vehicles. Some owners may comment about a no-crank or a start followed by an immediate stall. The SES MIL may not be on when the ignition is in the Run position. Any of the following DTCs may be set: B1370, B1325, P0650, P263A, P263B, P0513, P129D, P2535, and/or P0262B.