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Howdy everyone! 2014 Limited with the diesel with 62,000 miles. I bought it new with 26 miles on it.

Camping this past week up at Rangeley Lake State Park, coming back from hiking one of the local mountains and then it hit...dashboard lit up like a Christmas tree. First the Check Engine Light (Malfunction light) came on for no reason, out of the blue, followed several minutes later by the "service 4wd light" and "service electronic throttle control". Jeep went right into what I would call a "limp mode". Coolant temperature gauge went all the way cold (engine was warm, normal operating temperature), radiator fan was roaring on a higher speed than I have ever heard (alot louder vs when A/C is on), idle fell down to about 500 rpm and sputtered, felt like it was going to die. No throttle response, Yugo-like acceleration. Had to use the paddle shifters to shift up gears.

I am out in the sticks, far away from a city.

I pop the hood, take the engine cover off and begin to troubleshoot. Top radiator hose is hot. Housing that holds the thermostat is hot. Bottom radiator hose from the block is hot, to the point where the connector hose to the expansion tank, then goes cold. WTF. I think stuck thermostat or a partially operating thermostat.

I was thinking to myself..there is no way I can tow my 5500lb camper up mountains in this state.

I disconnect the negative terminal from the battery (AGM type for those who didn't know>>>big bucks!) for about 10 minutes. Reconnect, fire it back up...and the Jeep acts stupid again.

I open up the expansion tank, let that bleed off the pressure, grab the lower radiator hose and begin to squeeze it rapidly...my thoughts were to try to move the coolant thru the block and/or up to the thermostat.

It seemed to work, because it got rid of the codes, with the exception of the CEL. Coolant temperature was normal (just past what I would call the 1/4 mark). Make it back to camp. Jeep is left off till next morning.

Driving (without camper), temp gauge slowly comes up, and right before it hits that 1/4 mark, boom, dash board lights up again with those two faults.

I go thru the same troubleshooting steps and get out of it. I call the dealer and tell them what is going on and that they can expect me in the next day or so...if I can make it home.

At the dealership, talking with the service manager and the lead foreman....they never heard of this or seen this issue. Great. Figure it out I told them. I told them I thought it was a thermostat issue.

Two days at the shop pass. "Thermostat Rationality" is what they told me. Need a new housing/thermostat (can't just change a thermostat these days anymore) and a thermocouple that attaches to the unit.

I asked them how and why did it trigger my "service 4wd" warning. They didnt know...PCM threw off a bunch of codes. This is the printout of the codes that they recovered:
ABS B1783-01 Stop Lamp Control General
ABS U0401-00 Implausible Data Received from ECM/PCM. What the hell does that mean?
ABS U0403-00 Implausible Data Received from Transfer Case. Huh?
DDM B1D4A-2A Memory Switch Input Stuck
DDM B2860-15 Door Ambient Light Control Circuit short to Battery or Open
DTCM U0401-00 Implausible Data received from ECM/PCM
HVAC U0184-00 Lost communication with radio.
PCM P0118-00 Engine coolant temperature sensor 1 Circuit high.
PCM P0128-00 Thermostat Rationality
PDM B2860-15 Door Ambient Light Control Circuit short to battery or open.
PLGM U0422-00 Implausible Data Received from body control module.

Cool huh?

Dealer replaced that thermostat unit and temperature sensor. Glad I paid for the extended warranty. Look up that part on the NAPA web page and you can see the price on that sucker.

Once my Jeep hit 60,000 miles, it's reliability has started to deteriorate.

Anybody else have similar issues? I am beginning to look at getting a truck again to replace the Jeep.

Lee
 

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Hi Lee - I live in Australia, I'm having the same problem with my 2014 Jeep Diesel Overland. Based on other reports I've seen of this problem I had the coolant sensor changed 2 weeks ago (not the housing and thermocouple). That's really poked the bear, I have had 5 recurrences since then. Did the replacement of all those parts fix your problem. Cheers Terry
 

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Hi Lee - I live in Australia, I'm having the same problem with my 2014 Jeep Diesel Overland. Based on other reports I've seen of this problem I had the coolant sensor changed 2 weeks ago (not the housing and thermocouple). That's really poked the bear, I have had 5 recurrences since then. Did the replacement of all those parts fix your problem. Cheers Terry
Im in Australia too.
2014 Grand Cherokee, Overland diesel.
Has been a flawless car for +200,000kms.
The exact same lights, gauge failure and revving fan happened to me tonight.
Have you had any luck repairing the problem?
Cheers
Finn
 

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Hi Finn - Not repaired yet, my mechanic was closed for a while over Christmas. I've had these faults 4 more times since then. What I have found is that the error symptoms go away if you turn the engine off, so I suggest you pull over and do that as soon as they come up. The MIL goes off after you restart the engine 3-4 times. I'll send you more info on my findings of the errors later this morning. Cheers Terry
 

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Hi Finn - Not repaired yet, my mechanic was closed for a while over Christmas. I've had these faults 4 more times since then. What I have found is that the error symptoms go away if you turn the engine off, so I suggest you pull over and do that as soon as they come up. The MIL goes off after you restart the engine 3-4 times. I'll send you more info on my findings of the errors later this morning. Cheers Terry
Hi Terry
The lights, temp gauge drop and fan going into hyperdrive has happened for the 3rd time in as many days. Have only driven it 4 times....
I have my car booked in to Jeep tomorrow for a "diagnosis". Will let you know what, if anything, is discovered.
(Am going to walk across the road and test drive a Subaru while my Jeep is in the shop).
 

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Hi Terry
The lights, temp gauge drop and fan going into hyperdrive has happened for the 3rd time in as many days. Have only driven it 4 times....
I have my car booked in to Jeep tomorrow for a "diagnosis". Will let you know what, if anything, is discovered.
(Am going to walk across the road and test drive a Subaru while my Jeep is in the shop).
Sorry I didn't reply yesterday, I just received my OBD2 scanner and I'm trying to get it going correctly. When you leave it with them ask them to list the error codes that are present (you need an OBD2 scanner to see these). While I'm not a mechanic I know enough to know they need to be addressing the error codes not necessarily the symptoms that the car shows, I'm going in to see my mechanic on Friday to discuss next steps. Cheers Terry
 

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Sorry I didn't reply yesterday, I just received my OBD2 scanner and I'm trying to get it going correctly. When you leave it with them ask them to list the error codes that are present (you need an OBD2 scanner to see these). While I'm not a mechanic I know enough to know they need to be addressing the error codes not necessarily the symptoms that the car shows, I'm going in to see my mechanic on Friday to discuss next steps. Cheers Terry
Soooo.
Jeep have my car and are replacing the coolant temperature sensor(?) today, $330 for parts and labour.
BUT
Re the service throttle light.
They said the code was for "performance of the intake motor(?) actuator so they looked at the intake and found lots of carbon deposited from the exhaust gas reciculator.
They reccomend to clean the EGR, replace both the intake manifold, cos its plastic and cant be cleaned, and the swirl motor as it's not serviceable plus replace the boost pressure sensor as it too is "pretty clogged up" and will need replacing soon.
$6,500 for parts. Labour not quoted.
No mention of the setvice 4wd light.
Both coolant sensor and throttle issue "random events to have happened at the same time, sheer chance".
I asked them to put it back together. They said it will run in limp mode. I said I'll deal with it. I'm where you are now by the look of things. Sorry I haven't been of any help.
Will get them to email me everything, including codes.
There is a video of the diagnostic process but its hard to see carbon build up at the bottom of a pipe.
Cheers
Finn
 

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Sorry to hear that, can you please send me an email so I can continue to discuss privately [email protected] Cheers Terry
I'm curious Terry, how many miles/km do you have on your Jeep? Finn has +200000kms and ran into the same issues that I have (but I have more 281635km). I was told my issues are from "wear & tear" but EVERYTHING went down hill after I had the AEM installed (I broke down my story on a different thread)
Tony
 

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Soooo.
Jeep have my car and are replacing the coolant temperature sensor(?) today, $330 for parts and labour.
BUT
Re the service throttle light.
They said the code was for "performance of the intake motor(?) actuator so they looked at the intake and found lots of carbon deposited from the exhaust gas reciculator.
They reccomend to clean the EGR, replace both the intake manifold, cos its plastic and cant be cleaned, and the swirl motor as it's not serviceable plus replace the boost pressure sensor as it too is "pretty clogged up" and will need replacing soon.
$6,500 for parts. Labour not quoted.
No mention of the setvice 4wd light.
Both coolant sensor and throttle issue "random events to have happened at the same time, sheer chance".
I asked them to put it back together. They said it will run in limp mode. I said I'll deal with it. I'm where you are now by the look of things. Sorry I haven't been of any help.
Will get them to email me everything, including codes.
There is a video of the diagnostic process but its hard to see carbon build up at the bottom of a pipe.
Cheers
Finn
Not sure if you saw this response from me, I may not have 'replied' to your comment Sorry to hear that, can you please send me an email so I can continue to discuss privately [email protected] Cheers Terry
 

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I'm curious Terry, how many miles/km do you have on your Jeep? Finn has +200000kms and ran into the same issues that I have (but I have more 281635km). I was told my issues are from "wear & tear" but EVERYTHING went down hill after I had the AEM installed (I broke down my story on a different thread)
Tony
My first occurrence was at 95K, then 122K then more regularly from 135-145K. I started investigating after they started more regularly at 135K. What error codes are you getting, they're more important than the symptoms that get shown on the dash Cheers Terry
 

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My first occurrence was at 95K, then 122K then more regularly from 135-145K. I started investigating after they started more regularly at 135K. What error codes are you getting, they're more important than the symptoms that get shown on the dash Cheers Terry
Is there some way you can direct me to your other thread so I can read it Cheers Terry
 

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Go to this thread(Am I being screwed - 5k+ (after tax) DEF/Converter repair) I listed a brief overview of what happened to me #9.
Hi Tony, I see you are in USA. Fin and I are in Australia. I know we're talking about the same car, but I believe the emissions control varies quite a bit between US and Oz. We haven't had any AEM type mods here, I'm not sure whether our situations are comparable. Cheers Terry
 
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