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Old 12-04-2016, 10:03 AM   #1
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P Codes driving me crazy

I own a 2005 LJ that is plagued with the P0344/0340 code (camshaft position sensor intermittent interruption - bank 1 - sensor 1). When the code came up a few months ago, I replaced the camshaft position sensor with a factory one. I deleted the code and the code came back the next day. I unplugged the sensor and all of the ECM plugs and made sure they were all clean and then deleted the code again. After 2 days, the code came back. I took it to the dealership and they performed the P0344 TSB, I took it home and the code came back the next day. I took it back to the dealership and they kept it for 3-4 days. They said they checked every connection in that system and performed several tests. A few things they did included relearning the sensors as they found the sensor sync to be off by 11 degrees. They set it to zero. They checked for shorted circuits on K900, K44 and F856. They said the code did not return and they could not find anything that would have caused it in the first place. I took it home and the code came back after 2 days.

3 trips to Rockwall Dodge and each trip they say they have it fixed. Code always comes back the day after I pick it up. Same issues, same code. They even had a ticket in with the manufacture support program. I figured out early on that it was clear that they had no clue as to what was happening because they didn't charge me and this last time they seemed to throw out some things they "noticed " where wrong but not once tried to sell me the fix.

I tested a theory of mine. If I start the Jeep When the ECT is below 90 degrees, the P0344 code comes back and the engine rev limits around 2400 (limp mode). I let the engine idle until it reaches normal operating temperature. I use my scan tool to clear the code and the code stays gone all day. I can drive it all day and the code does not come back and no limp mode. It can even sit for multiple hours and when I drive it again, everything works fine. It seems like anytime the ECT drops below 90 degrees, the code comes back. It has to sit overnight for the code to return unless it's cool outside. If the ECT falls below about 80 degrees, the engine requires very long cranks to start. I'm SO frustrated. Does this issue sound familiar to anyone? I've scoured the internet and have not found an instance where this was a continuing issue and the fix was found.

Oh, and I replaced the OPDA last year with a Doorman unit. The only reason I replaced the camshaft position sensor is because I've read a lot about the Doorman sensors going bad pretty quick. So, when the code came up, I just decided to replace the Doorman sensor with a factory one. The OPDA gear and the camshaft both show a little wear, but it's not bad. This seems to be a temp issue to me. I'm stumped and extremely frustrated. If I want to drive the Jeep at all, I have to go through the entire process of heating it up first and then making sure the ECT stays above 90 degrees. PITA!

I forgot to mention that I'm getting real time accurate ECT from the Live Data function on my Scan Tool. So, when I'm mentioning ECT, it's not a guess, it's what the computer is showing. Now, this may not be the parameter that is causing the DTC to trigger, but it's just the most obvious to me.
ECT - above 89-90 degrees - starts, runs, no codes
ECT - below 89 degrees - starts, will not rev above 2300 RPM, code P0344/0340
ECT - below low 80's - long crank, starts, will not rev above 2300 RPM, code P0344
Trigger of DTC requires ECT to be above 200 degrees (usually 205-210) before code can be erased

I took the Jeep to a small shop the other day to a tech that I trust and he mentioned that it is possible that the timing chain could have enough slack to trigger those codes. I've heard a slight rattling sound on cold start-ups for a while, so I thought I would give it a try. Although the old chain did have some slack in it, a new kit did not fix my problem. After doing some testing and diagnostics of the systems and wiring that could cause those codes, he said that he thinks the computer is bad. He recognizes that problems are very rarely due to bad computers, but he seems pretty sure on this one.

I just hate to keep throwing money at it. But, if I were to get a computer for it, does anyone have suggestions for a reputable company with a good track record? I'm about to the point of giving up, I'm so frustrated.
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Old 12-05-2016, 11:12 PM   #2
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Anyone have any ideas of what might be going on? I'm totally baffled.

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Old 12-06-2016, 06:58 AM   #3
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If you have the ability to borrow a computer from another jeep like yours, I would give that a shot before gambling on a new computer. If you unplug the coolant temp sensor when cold and start it, do you get these codes? Conversely, if you unplug the sensor when the coolant is above 90 and start it, do the codes return. Give that a shot. It's interesting that it's fine when it stays warm. By unplugging the sensor I'm curious if it is actually referencing coolant temperature or not to set the code.
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Old 12-07-2016, 10:43 AM   #4
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Originally Posted by CzerOne View Post
If you have the ability to borrow a computer from another jeep like yours, I would give that a shot before gambling on a new computer. If you unplug the coolant temp sensor when cold and start it, do you get these codes? Conversely, if you unplug the sensor when the coolant is above 90 and start it, do the codes return. Give that a shot. It's interesting that it's fine when it stays warm. By unplugging the sensor I'm curious if it is actually referencing coolant temperature or not to set the code.
Thanks for the idea. I tried that this morning, but no change. It is about 45 degrees today (the coldest it has been since my issue started) and even with the ECT at 212 degrees, the codes will not clear and requires long cranks. Bummer. It seems that temperature has something to do with it, I just don't know what the temp is affecting to cause the codes.
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Old 12-07-2016, 11:07 AM   #5
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Originally Posted by rock.crawler View Post
Thanks for the idea. I tried that this morning, but no change. It is about 45 degrees today (the coldest it has been since my issue started) and even with the ECT at 212 degrees, the codes will not clear and requires long cranks. Bummer. It seems that temperature has something to do with it, I just don't know what the temp is affecting to cause the codes.
Shot in the dark here. But if you reference a wiring diagram; check the wires resistance between the sensor plug and the PCM both cold and warm. Since it sounds like everything else has been checked multiple times. Wondering if perhaps there is a pinched wire or heavy resistance for another reason. Would get better as it warms up under the hood. Again, complete shot in the dark... But check if there is a big difference in resistance. the other option is to 'de-pin' wires from both connectors, make a new wire to put in their place, and test to see what happens (eliminating any wiring concern between point A and point B)
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Old 12-19-2016, 05:12 PM   #6
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You're not alone...Im having the exact same issue with my 06 LJ. Temp dropped from 87 to 41 friday night into Saturday Morning (South Texas ), came out to start the Jeep and the code is back. Last 2 times I got the code, it rained the night before so I was thinking that had something to do with it. I waterproofed everything I could with Dielectric grease and that seemed to work for a couple months. I've already replaced the CSPS as well....Im at a loss!!!
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Old 01-09-2017, 10:15 PM   #7
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Originally Posted by CzerOne View Post
Shot in the dark here. But if you reference a wiring diagram; check the wires resistance between the sensor plug and the PCM both cold and warm. Since it sounds like everything else has been checked multiple times. Wondering if perhaps there is a pinched wire or heavy resistance for another reason. Would get better as it warms up under the hood. Again, complete shot in the dark... But check if there is a big difference in resistance. the other option is to 'de-pin' wires from both connectors, make a new wire to put in their place, and test to see what happens (eliminating any wiring concern between point A and point B)
Ok, I performed a resistance check on the wires from the PCM to the CPS and there is zero resistance. All seems good. It got really cold here the other day and I had to put the Jeep in the garage with my garage heater pointed down onto the motor just to warm it up enough to clear the codes. On the way to work the under hood temps dropped low enough for the codes to return while driving. I'm starting to lean towards this being a PCM issue. I'm going to look into sending mine in and having it checked and rebuilt instead of getting one from them. If anyone else has any suggestions, I'll take 'em.
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Old 01-09-2017, 10:22 PM   #8
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You're not alone...Im having the exact same issue with my 06 LJ. Temp dropped from 87 to 41 friday night into Saturday Morning (South Texas ), came out to start the Jeep and the code is back. Last 2 times I got the code, it rained the night before so I was thinking that had something to do with it. I waterproofed everything I could with Dielectric grease and that seemed to work for a couple months. I've already replaced the CSPS as well....Im at a loss!!!
Sorry to hear that you are having similar issues. Heck, I'd take it tripping codes every few days as opposed to EVERY day. You are fortunate that it's not every day. If you find a fix, let me know. I'll do the same.
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Old 01-10-2017, 07:16 PM   #9
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If you search P0340 & P0344 you will see some ’05 & ‘06s getting either or both of these codes lately. Most, if not all, are after replacing the OPDA with Dorman or Crown units. Those have cam sensors that are known to throw these codes. Putting the original sensor into the replacement OPDA almost always fixes that. However, often the owners have tossed the old sensor with the OPDA. For some reason the “new” Mopar cam sensors don’t usually fix the problem. Most report only getting the codes (& going into limp mode) when cold & after warm up can shut it off then restart the engine & the code & limp mode are gone & stay that way until it cools off. Then back to the same procedure. Here is one guy that MAY have fixed his.

OPDA sensor P0340 P0344



REPORT IF THIS WORKS OR IF YOU TRY BUT THE CODE(S) COME BACK.
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Old 01-11-2017, 02:00 AM   #10
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Originally Posted by RUBI 4 MY MRS View Post
If you search P0340 & P0344 you will see some ’05 & ‘06s getting either or both of these codes lately. Most, if not all, are after replacing the OPDA with Dorman or Crown units. Those have cam sensors that are known to throw these codes. Putting the original sensor into the replacement OPDA almost always fixes that. However, often the owners have tossed the old sensor with the OPDA. For some reason the “new” Mopar cam sensors don’t usually fix the problem. Most report only getting the codes (& going into limp mode) when cold & after warm up can shut it off then restart the engine & the code & limp mode are gone & stay that way until it cools off. Then back to the same procedure. Here is one guy that MAY have fixed his.

OPDA sensor P0340 P0344



REPORT IF THIS WORKS OR IF YOU TRY BUT THE CODE(S) COME BACK.
Wow, I'll have to give that a try. Wouldn't it be crazy that it would end up being something so simple.
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Old 01-11-2017, 06:29 PM   #11
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