Odd Noid Light Reading - JeepForum.com
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post #1 of 2 Old 02-08-2020, 08:00 PM Thread Starter
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Odd Noid Light Reading

Backstory: Recently got a used 2014 Grand Cherokee clone (Durango). Awesome maintenance records--serviced at a major dealership every 4-7k miles. Sat for sale for about 5 months at used car dealer, and I suppose that's where this issue came up (some VERY low temperatures during this).

Ran perfect first day I checked it out (let it sit for a while on lot to warm up and took it for an extensive test drive). Perfect the day I picked it up and drove back home (80 minutes). Perfect going to work. Then not very good when hitting a couple stores after work on the way home. Misfires and CEL popped up quickly. Scanned when I got home.

P0303 and P0203. Obviously, the P0203 (injector circuit malfunction) is causing the misfire code.

So... either wiring issue, pcm, or injector. Took a noid light to it and...flickering! Cool, just a simple injector replacement--no wait...flickering stopped. Back on. Back off. Back on. Ad nauseam. Sometimes it flickers for a solid 20 seconds straight, off for 2 seconds, and back to flickering. Sometimes the pause is much longer and between shorter periods of flickering.

The way it was driving, it certainly felt like that's how the misfiring was happening. Feel it is safe to rule out a bad injector, as it is working when it is receiving the signal.
Tested the noid light on injector 1 just to be sure--yup, flickering is constant like you should see on a normal vehicle.

So...where do you guys recomend going next?
My knowledge of electrical stuff is very subpar. My DIYer experience has been a lot of part replacement (gotta love that Ford 5.4l 3v!).
I'm suspecting either a bad PCM or just a bad/corroded ground somewhere. I suspect I should next be testing the grounds, yes? But I'm not too sure how all to go about that with a multimeter/what I should be looking for.

It's the 3.6l V6 pentastar.

Dealer did say I could bring it over to either of the two shops that they have service their inventory and it'll be covered. But...they're a bit far...both over 60 miles away (plus ~$4 in tolls each way) and closed on the weekends. I'd have to take a day off from work to drive up, let them do it, and drive back. Would rather just take care of it myself...if it is the PCM, it's very easy to access. Pretty sure they'd refund me for it (would confirm before, of course). If it really is just a bad ground or something simple...I'd really hate wasting a vacation day for that.

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post #2 of 2 Old 02-10-2020, 08:50 AM
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Location: Wentworth
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Honestly, I would let that dealer deal with it.

02 WJ Laredo, heavily optioned but stock
12 JK, 3.5" Teraflex/Franken lift, Bilstein 5100's, BFG KM3's 37x12.5/R17
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