Survey- For those with misfire issues

[jeepit]

Hi
I had the miss fire codes come up as well as the ESS light on mine after about 600 miles. It spent a month in the dealership, replace PCM, O2 sensors.
The final fix was a new valve cover and gasket. One tech noticed the smallest amount of oil on the back side of the block coming from the valve cover, it was dripping onto the O2 sensor wire harness and knock it out causing all my issues. New cover and gasket as well as cleaned the harness and another O2 sensor now at almost 15,000 miles and no more issues.

i am glad that it seems to have fixed the problem for you.
Did you have P0300 random multiple missfire?

i am still waiting for them to fix mine,

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[jeepintj]

Each time I had my issues this is what happened

ESS light comes on
Engine starts running rough
Check engine light comes on

Codes
P0300
P0171
P2096 (This one was only present 2 of the 3 times it happened)

i am glad that it seems to have fixed the problem for you.
Did you have P0300 random multiple missfire?

i am still waiting for them to fix mine,

 

[Enraged]

Build date: 11/19
Mileage when it first occurred: 180
How many times has it occurred: Once
What exact codes did it throw: P0300
Is the issue on going? Yes
If so, what has been done to try to solve the issue? Scheduled appointment with dealer.
Was the issue ever fully resolved? Not yet

I had this thing for 2 days before the start/stop started turning off and now the P0300 code. Dealership can't get me in for a week. I asked the salesman if they can do anything and he said it's not a problem and I probably left the battery sitting or something (whatever that means).

Are the majority of these issues turning into lemons or are they getting fixed? How bad is it to drive on? They won't see me for a week which means I have no choice but to drive on it.

 

[Janstead]

Build date: 10/22
Mileage when it first occurred: 900
How many times has it occurred: twice
What exact codes did it throw: P0300
Is the issue on going? Yes
If so, what has been done to try to solve the issue? Many new parts including whole engine swap, which still didnt fix it.
Was the issue ever fully resolved? Yes and no, they had to buy the jeep back, but still havent figured out what's wrong with it. Has been in shop since week of Thanksgiving.

 

[GlacierGladiator]

Build date: not sure
Mileage when it first occurred:3500
How many times has it occurred:1
What exact codes did it throw:P0300
Is the issue on going? Y
If so, what has been done to try to solve the issue? Cleared code
Was the issue ever fully resolved? N

my first ESS light came on around 900 miles. Upon restart it would work fine for a few weeks, do the same thing again. Now an engine light came on with it, and was on until a reader was plugged in. This was just today so no further info on the code coming back. I will keep it updated.

Any update? Was the issue resolved?

 

[GlacierGladiator]

Build date: 10/21/2019
Mileage when it first occurred: around 200
How many times has it occurred: I reset it once, and ut came back after about 300 miles
What exact codes did it throw: p0300
Is the issue on going? Y
If so, what has been done to try to solve the issue? Nothing yet. I'll be taking it in January to get checked out along with the Auto start/stop
Was the issue ever fully resolved? Not yet

Any update?

 

[GlacierGladiator]

I don't have all information such as build date ect.

Purchase date: September 24, 2019
Overland edition, CEL along with the Yellow autostart exclamation mark light came on 3 times and went away at different mileages. They all occur under similar circumstances. Not at start up but during a harder than normal acceleration where the motor RPMs are close to or just above 4000. 2 times in the first 1000 miles, again before 2000 miles, and currently at the dealer with around 2900 miles. Went to dealership on December 26 told light was on for misfire and that they are replacing rocker arms on the "right" side of motor. Was told that they would receive all parts on the 27th. Received a call on the 27th that it was not finished. Call on the 28th was the technician was not able to complete repairs prior to him getting off work at 3 when the service department was open until 6. Service department closed today. So if they don't complete repairs by tomorrow, I will become more than annoyed. I want it fixed correctly but it is no fun spending the amount of money for a vehicle and being without it.

After the second round of rocker arm replacements has the issue been fixed or has any of the lights returned after the "fix"?

 

[GlacierGladiator]

Build Date 09/2019
Mileage 1800
Still on just happened yesterday
P0300
Nothing done to try to resolve issue
Making appointment with dealer this morning
Also having them check the ESS

Was your issue resolved?

 

[GlacierGladiator]

October 15 final inspection per index card w/ manual.
JTR A! light came on and went away on 7th day, 8th days 200 miles Check engine light came on P0300 multiple cylinder missfire and stayed one, all of the dash light flashed at stop sign the other day as if it was about to die. Remote start quit working today.
Total lemon
Taking to dealership tomorrow
This is really piece of crap that they built, if you can't build a engine that lasts a week, then why are you even in car business FCA?

I have a chevy with 70k miles and 0 problem, i should have bought a chevy instead of putting 50k for this piece of junk, even though i like the truck, interior exterior but the engine is piece of junk.
Going through the forum, looks like they don't know how to fix it.
Not sure how long its gonna run with CEL already on with 200 miles, i can't trust this truck.
Really disappointed in my first Jeep. Not sure if i even want to keep it.

Was this resolved?

 

[GlacierGladiator]

Build date:5/24
Mileage when it first occurred:16900
How many times has it occurred:still ongoing
What exact codes did it throw: multiple misfire, crankshaft sensor a/b
Is the issue on going? Y
If so, what has been done to try to solve the issue? They checked coil packs, they end up replaced the rocker arms on 3 cylinders
Was the issue ever fully resolved? Y

How's your JT doing? Any lights return after the rocker arms were replaced?

 

[GlacierGladiator]

Hi
I had the miss fire codes come up as well as the ESS light on mine after about 600 miles. It spent a month in the dealership, replace PCM, O2 sensors.
The final fix was a new valve cover and gasket. One tech noticed the smallest amount of oil on the back side of the block coming from the valve cover, it was dripping onto the O2 sensor wire harness and knock it out causing all my issues. New cover and gasket as well as cleaned the harness and another O2 sensor now at almost 15,000 miles and no more issues.

Still no issues?

 

[GlacierGladiator]

Build date: 10/22
Mileage when it first occurred: 900
How many times has it occurred: twice
What exact codes did it throw: P0300
Is the issue on going? Yes
If so, what has been done to try to solve the issue? Many new parts including whole engine swap, which still didnt fix it.
Was the issue ever fully resolved? Yes and no, they had to buy the jeep back, but still havent figured out what's wrong with it. Has been in shop since week of Thanksgiving.

Any issues with your replacement JT after they bought the other one back?

 

[Janstead]

Any issues with your replacement JT after they bought the other one back?

They bought it back. Didnt get a replacement. Still deciding if i wanna try another one.

 

[25rawls]

After the second round of rocker arm replacements has the issue been fixed or has any of the lights returned after the "fix"?

At the moment I have not had the light return. about 1k miles after the fix. Pray it is a permanent fix

 

[Sal]

How's your JT doing? Any lights return after the rocker arms were replaced?

Funny enough they still have my JT. They were able to fix the misfire and the codes. But they weren’t able to fix the noise. They ordered a new engine and should come in on 2/12.

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