Trouble Codes P1411 and P1414

08GCL · May 13, 2024

I have a newly installed remanufactured 5.7L Hemi w/MDS in my '08 Grand Cherokee Limited. It ran fine for a couple of weeks after installation, then started missing. The initial trouble code read that ignition coil #6 needed to be replaced. Did that and it ran fine for a week. Then it started missing again and the check engine light came on, but then the missing smoothed out and the check engine light went off! The next day it started missing again, and that time the check engine light stayed on, so I had the trouble codes read again; this is what was shown:

So, I again replaced ignition coil #6 and everything ran fine during a test drive.

The next day she started right up but a couple miles down the road, she started missing lightly without the check engine light coming on. Got to the destination OK but on the way home she was missing after startup but a couple miles down the road, the missing stopped - all this without a check engine light coming on.

The day after that, she started up fine but, again, a couple miles down the road started missing, and this time the missing was intermittently interspersed with more violent knocking and the check engine light came on! Needless to say, I didn't make it home, instead parking at a nearby relative's house. The trouble codes read the same as above except no mention of an ignition coil.

The weird thing is, she'll start right up and run fine some days and other days will miss but smooth out and some days will miss and get worse. Since the one time she missed for two days in a row, it hasn't again happened two days in a row; even after the worst days, the next day it runs fine, at least for a bit.

The P1411 and P1414 codes have popped up after the worst episodes of missing. Anyone have any idea of what causes them?
Anyone have experience with intermittent missing/knocking like this?
Anyone know the cause of this kind of intermittent missing/knocking?

Appreciate all serious help, please.

UKJeephemi · May 13, 2024

Have a read of my Hemi story, its an MDS issue

08GCL · May 13, 2024

Thank you for sharing your story, UKJeephemi. It certainly reads like my story. I had not thought the MDS solenoids could be the cause of my ills because they came new with the remanufactured engine. However, my remanufactured engine began acting up around the several hundred mile mark when your Dorman MDS solenoids failed, so there is that similarity too. I will try routinely running in Tow/Haul mode, to disable the MDS, for a while and if no missing/knocking recurs, then I will take that as confirmation of bad MDS solenoids and contemplate replacing the existing with genuine MOPAR ones.

Please reply to tell me if I have misunderstood any of the above. THANK YOU VERY MUCH.

I will come back to post results down the line to help others with similar issues, as you've helped me.

UKJeephemi · May 14, 2024

08GCL said:
Thank you for sharing your story, UKJeephemi. It certainly reads like my story. I had not thought the MDS solenoids could be the cause of my ills because they came new with the remanufactured engine. However, my remanufactured engine began acting up around the several hundred mile mark when your Dorman MDS solenoids failed, so there is that similarity too. I will try routinely running in Tow/Haul mode, to disable the MDS, for a while and if no missing/knocking recurs, then I will take that as confirmation of bad MDS solenoids and contemplate replacing the existing with genuine MOPAR ones.

Please reply to tell me if I have misunderstood any of the above. THANK YOU VERY MUCH.

I will come back to post results down the line to help others with similar issues, as you've helped me.

You are spot on, I did loads of research and spent loads time collecting info, as it became a total mare for me to deal with. Until you understand how MDS works. It's a shame Jeep did not put more info in their literature to help owners with stuff like this as its a major feature.

08GCL · May 27, 2024

I've been driving in Tow/Haul mode for a couple weeks now without any missing or knocking, confirming in my mind that the MDS solenoids are the cause of those problems as indicated by the P1411 and P1414 trouble codes. My mechanic is talking with the engine remanufacturer to see if they'll stand behind their work and pay for replacement of the solenoids or if I'll be stuck with that expense. Genuine MOPAR factory solenoids seem to run about $170 apiece so not an inconsequential cost, plus labor. I'll keep reporting until final results for those who might be interested.

UKJeephemi · May 27, 2024

I ended up footing the expense for 4 Dorman solenoids and then 4 Mopar solenoids, but since I fixed this set-up the engine has been fine and the MDS has been working well as new

08GCL · Aug 25, 2024

Thank you for your reply; apologies for not checking in more often.

My saga continues. My good friend, who is an older mechanic so no longer does the actual work but has been leading the effort for me, has got the remanufacturer to agree to reimburse us for the cost of OEM Mopar solenoids and the labor to install them in place of the existing malfunctioning Dorman solenoids. That is great news as my buddy tells me the cost of the Mopar solenoids has risen into the $400 apiece neighborhood. So, it is wonderful to see that your experience shows that once the Mopar solenoids are installed, all should run as new.

The not-so-good news is that OEM Mopar solenoids do not appear to be readily available as we are still waiting for them to arrive. Once we get them, we'll get them installed and I will report back, hopefully that my experience mirrors yours and all is well.

I have been patient since in the meanwhile, I continue to drive in tow/haul mode without issue. The remanufactured engine runs smoothly and powerfully and I look forward to the day when I no longer have to remember to switch to tow/haul mode. I note that if I forget to do so first thing in the morning, the engine misses and knocks until I pull over, shut down, then restart and go into tow/haul mode. Sometimes, after a drive and the engine is warm, if I forget to put it in tow/haul, it will run smoothly in normal mode but never when the engine is cold.

Cheers and aloha!

08GCL · Sep 9, 2024

Well, finally, the Mopar solenoids arrived! My buddy dropped them off at my house on 8/27 and the mechanic who's been doing all the work came out to my house on 8/28 and, in about an hour, removed the old Dorman solenoids and put in the Mopar OEM replacements. Hallelujah, all is good! I've been driving without having to use tow/haul mode for coming up on two weeks now and the engine is running smoothly and strongly with no problems whatsoever, knock on wood. I will make a final post in a couple of weeks if all continues to run fine as is expected.

To add to the general knowledge base here, let me tell you what I have found in regard to the originally installed Dorman solenoids.

On visual inspection, all appeared undamaged but there was an accumulation of gunk at the tips of the solenoids; I don't know whether that is normal or not. The screens on the sides were clear/unblocked and note that the engine oil is clear and light colored as one would expect of new oil with only a couple thousand miles of usage.

I measured the coil resistance of the Dorman solenoids and found that all four read between 11.3 and 11.8 ohms, which I believe is normal. This indicated that there were no open circuits. However, when I proceeded to apply 12 volts to each solenoid, I found that only three of the four operated as indicated by an audible and tactile clack/clunk with the on/off of the 12 volts. There was no visual indication of operation; the shafts did not move so the moving part must be inside, out of sight.

The fourth solenoid must have been stuck as there was no sign, neither audible nor tactile, of it operating despite repeated on/off application of 12 volts. This one faulty solenoid is obviously at the root of the missing, stumbling, and knocking I experienced. I don't know which cylinder this solenoid came from but the P1411 and P1414 error codes shown in my original post indicate that there is likely another solenoid that gets stuck occasionally. Given that the actuating coils seem intact based on the measured resistance, it would seem that the Dorman solenoids do not generate sufficient magnetic force to overcome inertia in all cases.

Thank you, UKJeephemi, for responding to my original post and putting me on the right track leading to this happy ending. I will report back one more time to confirm that the marriage continues happily after the honeymoon.

UKJeephemi · Sep 9, 2024

This agrees with my experience, thanks for confirming!

08GCL · Sep 29, 2024

This will hopefully be the end of this thread. My Grand Cherokee continues to run like new with its remanufactured engine using genuine MOPAR MDS solenoids, now over a month since the defective Dorman solenoids were replaced. Moral of the story: if ever you replace MDS solenoids in a 5.7 liter hemi, or get a remanufactured motor installed, ALWAYS ensure that the OEM solenoids are installed.

Many thanks and blessings upon UKJeepHemi for his invaluable sharing of his nearly identical experience!

Aloha.

Trouble Codes P1411 and P1414

08GCL

UKJeephemi

08GCL

UKJeephemi

08GCL

UKJeephemi

08GCL

08GCL

UKJeephemi

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