Jeep randomly dies

[MMcClure21]

Jeep is an 06 LJ with the 4.0 and manual. Was driving to the store today to grab dinner and jeep just shut off. No rough idle or sputter, just dies. Coast into parking spot and it starts right up again. Thought it was a fluke. A few hours later I head out and about two miles later dies again. Check engine light comes on, codes are P2302, P2305, P2308. So secondary circuit on all three coils.
Does this sound like just a bad coil or a dreaded pcm? Just seems strange to cemetery die with no warning. Any thoughts would be greatly appreciated.
M

 

[JKP]

PCM. That's what my 06 would do when it went. If going fast enough, it would restart itself with the MT.

 

[CharlesHS]

I would suggest you contact Mark at Wranglerfix.com
@Wranglerfix is the forums resident ECU expert who has assisted many forum members with resolving ECU problems.

 

[Wranglerfix]

@MMcClure21 It is the pcm that has failed you. O2 sensor codes, loss of gauges and stalling while driving are all signs of a faulty pcm.

You can call me to discuss in further detail if you’d like. 866-888-7710.

 

[MMcClure21]

@MMcClure21 It is the pcm that has failed you. O2 sensor codes, loss of gauges and stalling while driving are all signs of a faulty pcm.

You can call me to discuss in further detail if you’d like. 866-888-7710.

Two quick questions for you Mark. Will I have to reprogram keys at all after new computer goes in or will the skim go away with the new one?
Second, were they're multiple makers of original pcu's? I look at pictures of other 06 pcu's and they all have the cover attached with screws. Mine just has fold over tabs on all 4 sides.
Thank you and I will let you know how it works out when I install it Thursday
Matthew

 

[MMcClure21]

Two quick questions for you Mark. Will I have to reprogram keys at all after new computer goes in or will the skim go away with the new one?
Second, were they're multiple makers of original pcu's? I look at pictures of other 06 pcu's and they all have the cover attached with screws. Mine just has fold over tabs on all 4 sides.
Thank you and I will let you know how it works out when I install it Thursday
Matthew

So the new computer is a beauty and smoothed things out right until it dies again.
I also swapped in a new coil and plugs which I don't know how the jeep even ran as the gap was .095!!!
Jeep purrs like a kitten right up until a random stall. I have the same codes for coil A,B, and C secondary circuit. P0688 and P0633. One is for the SKIM key and the other is for the ASD relay circuit.

The P0688 and P0633 only stay when the jeep won't restart for a few minutes, the coil ones stay unless erased and show back up the next stall.

The P0688 is only for starting so I doubt that is causing the stalling but I am baffled now about the coil codes.

Any suggestions?

 

[JKP]

Swap the ASD relay if you haven't already.

Inspect your wiring for chafing, especially over the dipstick and behind the valve cover. The split loom on these just crumbles leaving the wires exposed.

 

[MMcClure21]

Swap the ASD relay if you haven't already.

Inspect your wiring for chafing, especially over the dipstick and behind the valve cover. The split loom on these just crumbles leaving the wires exposed.

Swapped the relays early on and definitely isn't the relay. Looked over all the wires and nothing. I can wiggle every wire under that hood and not so much as a hiccup.

I next went to inspecting all the grounds. I found the ground going to the engine block oily and covered in sludge from a past valve cover leak. Cleaned that up completely as well as a ground disconnected behind the dash. Knock on wood, I drove about 20 miles this evening and left it to idle for almost another hour and no more stalling. I am waiting for the entire weekend before I call it a success.