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P0394

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Old May 7, 2026 | 03:26 AM
  #1  
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From: Salem Ohio
Default P0394

2015 JKU, replaced rocker arms, oil cooler, spark plugs, thermostat housing, and temp sensor, started up, engine sounded good, threw a p0390 and p0394. Checked and noticed I forgot to plug in driver side cam sensor, plugged it back in and p0390 went away. I still have P0394 code up, I swapped sensors from side to side and code still stays the same, with bank 2. Recently I tore driver side valve cover back off, but did not find anything wrong internally which I didn’t think there was. I’m leaning toward a broken wire or something with wiring but I can’t find anything yet, have 5 volts and ground to cam sensor plug, and continuity to ecu.

At this point I’m stumped…Anyone have any ideas or recommendations? Thanks!
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Old May 7, 2026 | 10:17 AM
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The very first time I ever dealt with a bad rocker and tore things apart to fix things, I introduced P0396 into my life (corresponding to P0394). Not sure if that jeep has ever been opened up before, but I swear once those sensors move from the factory install, it's major PITA. Given your situation is pretty straight forward, I would ask if you completely removed the camshafts to replace the rockers. if so, where did you set the camshafts? those tone rings are extremely sensitive to magnets and metal. Was there buildup of gunk on the tone rings and did you clean them? Given that you didn't have a code prior to repair, I'm thinking that it's less likely to be electrical unless you were really yanking on that wiring.

Not sure it's helpful to you, but might glance over this thread where i listed the main culprits -

https://www.jk-forum.com/forums/stoc...g-saga-361310/
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Old May 7, 2026 | 12:35 PM
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Thanks for the reply, I did not take the cams out, only the caps, and loosened the front most one, to sneak the new rockers underneath the cam.
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