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p0394 code

17K views 19 replies 9 participants last post by  Old Dogger 
#1 ·
ive never read any posts when somebody finds a solution to their problem but ill post mine. I was getting the p0394 code for the cam shaft sensors when I was going on a trip fully loaded going up a steep grade at speed. I changed them both out but was getting the same thing, traction, cel light, half power ect. I changed them both out but still got the problem. a friend of mine chewed me out for letting the dealer change my oil and said to put in mobile one asap. he said the gum up from the penzoil was giving the cam phaser the wrong pressure or reading or something like that.( tech talk I didn't understand) but I did it, loaded up and took the cajon pass like a champ! no codes and the performance after the change was un fn real.:winner:
 
#3 ·
They changed my Cam Phasers this past April in Yuma Az. Im in Price Utah Area and going up the San Rafael Swell at 6% grade mine popped again. P0394 code with the traction control light on, Had to manually shift down to 2nd to get up the grade. Took it to the Price dealer and as usual they just follow the trouble tree and changed the CP Sensor. As I went up the grade this morning it popped back on again. I have another appointment on Friday and I requested they contact thier service representitive to help figure it out. I also called the number in my manual and asked to get a case manager to help me as well. They are suppose to contact me within 24 hrs. Tick ...Tick...Tick...
 
#5 ·
Hi All, for a while I've had numerous camshaft position sensor issues and P06DD (oil pump issue)

After having oil pump, timing chain, sensors changed and wiring checked I am down to P0394.

I can trigger it at highway speeds, engine warmed up and hot, engine under load, incline.
The CEL comes on and the traction control light, limp home mode (you all know the symptoms)

I am changing the PCM out next, for two reasons:

1. to eliminate this as a problem
2. to put a Daiblosport PCM in

The engine coolant gets to 109c (about 228f)
The outside temperature is over 30c (as hot as 40c) - I live in Sydney
The engine bay is really hot

I am running 5W20 oil

I am wondering if it is oil viscosity related.

I was thinking of having the fans come on earlier (Diablosport say their tuner can do this) to try to keep engine temperature down.

I am hoping that this will keep the viscosity higher.

I am also thinking of changing oil to 5W30.

Any thoughts?
 
#6 ·
Mine is a 2013, I have had this issue since 2015, The P0394 code is on left side, they replaced cam shaft and phasers on left side and that fixed it for 2 years. It happened again same issue at speed going up incline under load it trips the code. I finally got it back to where we winter and the dealer got Tech help from Jeep. They said it was engine fatigue on the left side and replaced camshaft the phasers and the head again and so far it has been almost another 2 years. Knock on wood. In tracking down this problem the dealers have change pcm, engine harness, timing chain and it now has had three camshafts and two heads replaced.

As luck would have it I poped another code just three weeks ago but for the right side cam sensor. Dealer replaced and I havent had an issuse since. Crossing fingers.
 
#7 ·
Mine is a 2013, I have had this issue since 2015, The P0394 code is on left side, they replaced cam shaft and phasers on left side and that fixed it for 2 years. It happened again same issue at speed going up incline under load it trips the code. I finally got it back to where we winter and the dealer got Tech help from Jeep. They said it was engine fatigue on the left side and replaced camshaft the phasers and the head again and so far it has been almost another 2 years. Knock on wood. In tracking down this problem the dealers have change pcm, engine harness, timing chain and it now has had three camshafts and two heads replaced.



As luck would have it I poped another code just three weeks ago but for the right side cam sensor. Dealer replaced and I havent had an issuse since. Crossing fingers.
Thanks, that is interesting. We shouldn't accept this as it is a massive design flaw. Normal wear and tear should not cause a potentially dangerous situation (limp mode is dangerous when it cuts in). This is likely a software issue and FCA should fix it.

Sent from my I4293 using Tapatalk
 
#14 ·
Welcome to the Forum, from Cave Creek AZ.
 
#15 ·
My P0394 started after a Valvoline oil change! Have since put in a mopar filter but it’s still happening. After reading a post here, I’ve got a crankshaft position sensor coming. Yes, crankshaft, not cam. Switched sides on them and it still alerted on the same side do not cam.
 
#17 ·
My P0394 started after a Valvoline oil change! Have since put in a mopar filter but it’s still happening. After reading a post here, I’ve got a crankshaft position sensor coming. Yes, crankshaft, not cam. Switched sides on them and it still alerted on the same side do not cam.
Did replacing the crankshaft sensor finally fix the issue? I'm at my wit's end!
 
#20 ·
No it did not. I finally sold the Jeep for 10K less than it’s worth because of that damn code. Disclosed the issue, of course. Bought a 2016 Rubicon. No problems so far.
Welcome to the Forum!
 
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