P0303 and P2308 -- 2016 3.6L Overland - JeepForum.com
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post #1 of 27 Old 08-14-2020, 07:11 AM Thread Starter
a2t22
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P0303 and P2308 -- 2016 3.6L Overland

Hey all

Trying to diagnose whats going on with wifes 2016 3.6L Overland ... started shaking really bad on highway, loosing power, flashing CEL.

Scanned codes and came back with 0303 and 2308

It has 44k miles on it and zero issues till this.

Is this something I can tackle here in my garage, or best left to dealer ? Im not sure exactly where #3 cylinder is, Ive seen multiple engine diagrams showing 1/3/5 on passenger side and some showing 1/3/5 on driver side. This engine has the intake plenum on the passenger side, so if 3 is there then this would be a real pain to get at and likely more than Im willing to mess with.

I did by the MaxCare warranty but I bought it on 7/21/20 and the dealership said they would NOT use it for 60 days (9/21/20) or FCA would not allow it saying it was a pre-existing issue. Anyone with experience on that ?

If #3 cylinder is in fact on the passenger side up under the plenum, this will be a $1000 job best case, so I may just have to wait until 9/21/20 to bring it in. Which sucks ...

Anyway, any help is appreciated. I can work on cars and all, have done many engine swaps ect ... but I really dont feel like going too deep into the motor on my own. We have 3 cars so could just park this 1 for a bit if it turns out to be time consuming.

One other note - there was some sort of recall on this vehicle that was done, IIRC it had a similar shaking/driveability issue. Not sure if it was related to this at all but could this be related to some recall that was performed ?

Thanks for all help in advance.



Paul
2016 JGC 3.6L Overland
2015 DD R/T
2005 911 Carrera

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post #2 of 27 Old 08-14-2020, 09:11 AM
jtec
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P2308 is a issue with #3 coil, the PCM does not 'like' the waveform of the coil firing.
Attached Thumbnails
firing order.jpg  

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #3 of 27 Old 08-15-2020, 10:03 AM Thread Starter
a2t22
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ok sweet thanks !!! so #3 is on the driver side, easy to get at

I will replace #3 coil and the plug, hopefully that solves it.

Much thanks.
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post #4 of 27 Old 08-15-2020, 10:08 AM Thread Starter
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that is the cylinder arrangement as well as the firing order, right ?
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post #5 of 27 Old 08-15-2020, 10:23 AM Thread Starter
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Actually and unfortunately i think you might be wrong. According to this post, the #3 cylinder for that engine is on passenger side, up under the intake mani ...

Its ridiculous in the age of too much information we dont know where the ****ing #3 cylinder is on a jeep grand cherokee but if you google it you will get conflicting info.

**link removed** -- look up southbayriders forum

Is there an actual mechanic on this board that knows the correct cylinder arrangement for 2016 JGC 3.6L w/VVT ??????
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post #6 of 27 Old 08-15-2020, 03:08 PM
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The FSM says:

"The cylinders are numbered from front to rear. The right bank is numbered 1, 3, 5 and the left bank is numbered 2, 4, 6. The firing order is 1–2–3–4–5–6. "

So #3 should be in the middle of the passenger side, which is the right bank I think.


For P2308. if the PCM detects that the secondary ignition burn time is incorrect, too short or not present, an error is detected. One Trip Fault. Three good trips to turn off the MIL.

Possible Causes:
(F344) ASD RELAY OUTPUT CIRCUIT
(K18) OR (K93) COIL CONTROL NO. 3 CIRCUIT OPEN
(K18) OR (K93) COIL CONTROL NO. 3 CIRCUIT SHORTED TO GROUND
COIL ON PLUG
SPARK PLUG
POWERTRAIN CONTROL MODULE (PCM)

This is a 2013 diagram, 2016 should be similar.
Attached Thumbnails
Screen Shot 2020-08-15 at 5.11.30 PM.jpg  

I just got lost in thought. It was unfamiliar territory;
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #7 of 27 Old 08-15-2020, 04:35 PM
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This thread shows camshaft sensor bank numbers, bank 1 is on the passenger side. Ignition should have same convention.

https://www.jeepforum.com/forum/f309...light-4385431/

I just got lost in thought. It was unfamiliar territory;
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #8 of 27 Old 08-15-2020, 04:44 PM Thread Starter
a2t22
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**** .. thats what i thought. Jtec above has it wrong...

so how hard will it be to replace the #3 coil ? Its under the intake manifold. Looks like a real ***** of a job.

Has anyone had experience with buying MAXCARE after the car was off factory warranty ? They told me i should wait 60 days to try to use it or they may claim it was pre-existing. That would be 9/21/20 which really sucks. If i cant use maxcare, how much is this gonna cost me ?




Quote:
Originally Posted by ColdCase View Post
The FSM says:

"The cylinders are numbered from front to rear. The right bank is numbered 1, 3, 5 and the left bank is numbered 2, 4, 6. The firing order is 1–2–3–4–5–6. "

So #3 should be in the middle of the passenger side, which is the right bank I think.


For P2308. if the PCM detects that the secondary ignition burn time is incorrect, too short or not present, an error is detected. One Trip Fault. Three good trips to turn off the MIL.

Possible Causes:
(F344) ASD RELAY OUTPUT CIRCUIT
(K18) OR (K93) COIL CONTROL NO. 3 CIRCUIT OPEN
(K18) OR (K93) COIL CONTROL NO. 3 CIRCUIT SHORTED TO GROUND
COIL ON PLUG
SPARK PLUG
POWERTRAIN CONTROL MODULE (PCM)

This is a 2013 diagram, 2016 should be similar.
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post #9 of 27 Old 08-15-2020, 08:32 PM
ColdCase
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I'm just reading from the service manual, so your mileage may vary. Looks like the same as changing a spark plug.

The FSM says #3 is not under the manifold and doesn't require removal of the manifold. You may have to remove the air inlet hose (3) to get at the coil.

-Disconnect the electrical connector from the Inlet Air Temperature (IAT) sensor (2).
-Loosen the clamp at the throttle body which is near the firewall (1).
-Loosen the clamp at the air cleaner body (4).
-Remove the resonator (3)


Otherwise its disconnect the battery, unlock and disconnect the coil's electrical connector, remove the coil mounting bolt, and pull the coil off with a slight twisting motion. Some here will try swapping coils between cylinders to see if the fault follows.
Attached Thumbnails
Screen Shot 2020-08-15 at 10.18.15 PM.jpg  

I just got lost in thought. It was unfamiliar territory;
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #10 of 27 Old 08-15-2020, 08:40 PM
ColdCase
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I should note that whatever is causing the P030 misfire could also be triggering the P2308 , as a bad mix will cause changes in ionization waveforms. But the book says to attempt to resolve P2308 first

That list includes :
INJECTOR CONTROL CIRCUIT
COIL CONTROL CIRCUIT
SPARK PLUG
IGNITION COIL
FUEL PUMP INLET STRAINER PLUGGED
RESTRICTED FUEL SUPPLY LINE
FUEL PUMP MODULE
FUEL PRESSURE LEAK DOWN
FUEL INJECTOR
ENGINE MECHANICAL
POWERTRAIN CONTROL MODULE (PCM)

I just got lost in thought. It was unfamiliar territory;
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #11 of 27 Old 08-16-2020, 07:49 AM Thread Starter
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my 2016 has the throttle body in the front not the back and there is no air inlet like your pic. the mani is on the pax side.

can you look at 2017 fsm ? i think there was a vin split in 2016 and they changed design of the engine completely. it should be in 2017-present

ill post pic of my engine today so you can see.
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post #12 of 27 Old 08-16-2020, 09:29 AM
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I don't have a 2017 FSM handy, the PUG update was in 2016. I had forgotten that the intake manifold was revised along with valve train, sorry.

You can get a two-three day pass to the FSM and other data at techauthority.com for like $35. It may save you some time and money.


https://www.allpar.com/mopar/V6/PUG-2015.php

I just got lost in thought. It was unfamiliar territory;
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #13 of 27 Old 08-16-2020, 10:00 AM Thread Starter
a2t22
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i really just need to know for sure where the hell the #3 cylinder is on my 2016 ...

if it is actually on the right bank, then its under the intake manifold and its beyond my ability to remove and replace that coil and plug ...
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post #14 of 27 Old 08-16-2020, 11:30 AM Thread Starter
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btw here is how my engine looks on the 2016 3.6L. Note the t-body in front of motor and intake manifold is over the right bank ...

https://www.**********.org/attachmen...272-jpg.71259/
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post #15 of 27 Old 08-16-2020, 12:29 PM
ColdCase
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Yeah that referenced allpar article has some decent photos. There are also V6 photos in the forum FAQ sticky thread. The V6 is used in a wide variety of FCA vehicles, Wranglers, RAMs, the trouble is finding a source you can trust. I dunno off hand is you need to remove the intake to get at #3.

FYI, the forum you linked to is banned by just about every other forum for past transgressions.

I just got lost in thought. It was unfamiliar territory;
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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