So this issue is on a 2010 with the 3.8l
Jeep suddenly has CEL and stuttering bad. Limped to closest parts store and scanned with JScan. P0300 & P2305. The P2305 was a misfire on circuit 1 (which I misread at first and thought cylinder 1). Anyhow, pulled plug wire off of #1 and the tip broke and stayed on the plug. BINGO! Easy fix, right? Nope. Put new wire on and same codes. Replaced plug, no go. Tried a new coil pack too, no go. Thought maybe a ground? Limped it home and did find a broken ground wire to engine block so jumpered it but no go.
Finally started researching and found another jeep forum that had a really good step by step for checking. I took more time with JScan and found cylinder 1 & 4 were misfiring. These coil packs have 3 coils in them that fire 2 cylinders at the same time and 1 & 4 is the center coil on the coil pack. Pulled wire connector off and checked ohms to ground, then pulled the Orange connector on the PCM and homed from there to the coil pack. Everything was good in the wiring. This led back to the PCM itself. Opened it up and as soon as I broke the seal I smelled the all familiar burnt electrical smell. One of the 3 IGBT transistors that fires the 3 coils was burnt.
These are obsolete but I found some from China. I ordered but they are having Chinese New Year so no telling when I will get them. In the meantime I am trying to get my hands on another PCM from a 3.8l. I am going to try and replace the one chip before forking out for a new PCM.
I will post an update once I can get my hands on a chip.
Jeep suddenly has CEL and stuttering bad. Limped to closest parts store and scanned with JScan. P0300 & P2305. The P2305 was a misfire on circuit 1 (which I misread at first and thought cylinder 1). Anyhow, pulled plug wire off of #1 and the tip broke and stayed on the plug. BINGO! Easy fix, right? Nope. Put new wire on and same codes. Replaced plug, no go. Tried a new coil pack too, no go. Thought maybe a ground? Limped it home and did find a broken ground wire to engine block so jumpered it but no go.
Finally started researching and found another jeep forum that had a really good step by step for checking. I took more time with JScan and found cylinder 1 & 4 were misfiring. These coil packs have 3 coils in them that fire 2 cylinders at the same time and 1 & 4 is the center coil on the coil pack. Pulled wire connector off and checked ohms to ground, then pulled the Orange connector on the PCM and homed from there to the coil pack. Everything was good in the wiring. This led back to the PCM itself. Opened it up and as soon as I broke the seal I smelled the all familiar burnt electrical smell. One of the 3 IGBT transistors that fires the 3 coils was burnt.
These are obsolete but I found some from China. I ordered but they are having Chinese New Year so no telling when I will get them. In the meantime I am trying to get my hands on another PCM from a 3.8l. I am going to try and replace the one chip before forking out for a new PCM.
I will post an update once I can get my hands on a chip.
