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Old 06-07-2019, 10:51 PM
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Got a problem that the dealership can't seem to fix

Good evening everyone-

For background information, I have a 2012 Sahara on 35s with a Mopar lift. I love this damn Jeep, and my dogs love nothing more than to clamber into the back and go with me on adventures.

I have had a problem with the Jeep for over a year, and replaced at least $1,500 in parts and labor and it's still not fixed. I'm aggravated.

Here's what happens:
At some point while driving (both at idle and at highway speeds), the Jeep will start to hesitate and buck. The throttle body idiot light illuminates, the check engine light comes on, and the traction control light comes on. Yesterday, these lights were joined with the addition of the low oil pressure light, a first in this circumstance. When this happens, I am unable to get the engine over 2000rpm, (even with the accelerator pedal floored) and if the rpm goes above 2000 due to a downshift, the engine dies and becomes very difficult to restart.

Plugging in my Superchips flash-something and reading the codes, I get the following messages:
P0344 - Camshaft pos sens A circ interm bank1 or single sens
P0339 - Crank pos sens circ interm
P2111 - Throttle actuator ctrl sys- stuck open
P0642 - Sens ref voltage 1 circ low
P2122 - Throttle/pedal pos sens/switch D circ low input
C121C - Torque request signal denied
U0401 - Invalid data received from ecm/pcm

I've been getting those same codes, off and on, for about the last year. In that time, the dealership has replaced the throttle body, the crank position sensor and the entire accelerator pedal assembly, again, to the tune of $1,500+. I'd be fine with that if the damn problem was gone, but it's getting worse.

Normally, I can clear the codes with the programmer and continue on my way, but yesterday, the codes wouldn't clear, and I was lucky to be able to limp home.

I don't know exactly what to look for, and since the problem doesn't arise during every drive, (sometimes not happening for months at a time, but yesterday happening 4 times during a single outing and almost leaving us stranded), I can't tell if the dealership has fixed the problem or not when I pick it up.

The Jeep is currently at the dealership for them to take another crack at it.
Any input or help I might get would be greatly appreciated.

Thank you in advance.

Brett

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Old 06-08-2019, 11:07 AM   #2
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How old is your battery?

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Old 06-08-2019, 11:47 AM   #3
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First things I would check are your engine block and other NEGATIVE (ground) wires are tight. Make sure the battery terminals are tight.
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Old 06-09-2019, 09:40 AM   #4
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That's not a sensor.


My guess....
Either your pcm or abs module are intermittent.
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Old 06-10-2019, 01:36 PM
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Thank you all for the replies.

My battery is a little over a year old. The battery terminals are tight, but I haven't found all of the grounds- I don't know if they're a potential problem or not at this point.

I've been reading up on the various error codes and based on the wide type of errors reported, I'm really hoping it's wire chafing or something similar. If it is the ABS or PCM, thats fine, although I'm sure it'll be pricey. At least it'd be fixed!
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Old 06-11-2019, 01:27 AM   #6
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Check the connections again. When the ECU browns out you'll see similar symptoms. Not the same error codes as yours but also had a voltage code. Went away with a clean and refit.
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Old 06-11-2019, 06:05 PM   #7
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Well, I looked at the wiring drawings for 2014, the 2012 should be the same. All your faults have the +5volts vref from the PCM in common. The oil pressure sensor as well. The dealership should have seen the intermittent signal codes and investigated there first. First thing I said was, why are they intermittent... hmmm maybe something is dropping out or a sensor is acting wonky pulling the 5 volt reference down. Could the PCM be acting up, what did the freeze frame data show?

Go back and find out if they investigated the common signal between all the sensors. If they go no, then they are idiots and tell them to get into the books and you aren't paying for it. If the parts didn't make the fault go away, then they didn't do their job, just took your money and waved goodbye as you left. That's why I hate Jeep Cares on this forum. Bring it back to the dealership so we can take your money. How about... If we didn't fix it, we give you your money back and try again. Would be nice if they passed that law wouldn't it.
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Old 06-12-2019, 04:56 AM   #8
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Quote:
Originally Posted by Axxkicker View Post
Good evening everyone-

P0344 - Camshaft pos sens A circ interm bank1 or single sens
P0339 - Crank pos sens circ interm
P2111 - Throttle actuator ctrl sys- stuck open
P0642 - Sens ref voltage 1 circ low
P2122 - Throttle/pedal pos sens/switch D circ low input
C121C - Torque request signal denied
U0401 - Invalid data received from ecm/pcm



i do not blame Superchips (or any other aftermarket sccanner) but WiTech as a dealer scan tool could be more accurate and give you the PIDs for each event.



2012 it´s a 3.6 Pentastar?




You have to be 100% sure that you do not have some mechanical timing related issues - like damaged magnetic trigger wheel on camshaft, loose oil galley bolts or similar. This can be checked with a lab scope quite easy


If that is correct, then thorougly check the plugs for camshaft sensors. Not only visualy. You have to check every single pin and wiring for cross talk between wires while wiggling the whole harness

Also measure the camshaft sensor wires all the way from sensor plugs back to PCM using the same manner.
There was a wiring harness/cam sensor plug issue with early 3.6 engines causing similar codes
This can also cause the P0642 - reference voltage on circuit 1.



If not, then there ale 2 circuits tied to this and various sensors on the same reference. CPS, Oil pressure sender, A/C pressure transducter, Throttle body assy and APP (pedal) sensor all hang on the same 5volt wire.
Check the harness near CPS and oil sender, check all plugs and clean all pins. Bad oil pressure sender or AC transducter are most common to fail


IMHO P0344 and P0642 are the main problems


P0339 could be also important, but relieson the same 5v circuit which causes P0642.



All other errors are caused by missing 5v reference or cam signal being out of phase.

If none of the above helps, then probably the PCM itself
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Old 06-14-2019, 05:35 AM   #9
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Sounds to me like a ground problem. I had a very similar issue in a previous vehicle. I found the one of the ground straps loose, tightened it, and the problem never came back.
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Old 06-16-2019, 02:52 PM
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Thank you all for the input!

I've been out of pocket for a bit, but have checked the grounds, and had the dealership look for any issues with the PCM and the 5V wire in particular.

Ill have to keep an eye on it and will absolutely report back if anything else happens.
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Old Yesterday, 02:05 PM   #11
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Originally Posted by Axxkicker View Post
Thank you all for the input!

I've been out of pocket for a bit, but have checked the grounds, and had the dealership look for any issues with the PCM and the 5V wire in particular.

Ill have to keep an eye on it and will absolutely report back if anything else happens.

Hope you have a better experience than mine!


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