SOLVED! P1404 Check Engine Code on 2021 JL Rubicon 4dr

[nsurati]

Hi Everyone,

Wanted to make this post in case others are having this issue. My Jeep threw a check engine sign the other week and using a scan tool, I was able to identify the P1404 diagnostic code. This means the EGR valve is not opening/closing when it is supposed to.

Given the issue, the valve is probably clogged with carbon deposit or a bad sensor. You can certainly clean this valve with some Seafoam or WD-40 but I was too lazy and did not have the patience lol. So I bought the new OEM valve which ran me $380, yikes. Install was fairly simple but a pain in the ass to get to the bottom nut. Make sure you have a small 1/4” ratchet.

Anyways after installing, putting the negative terminal back on for the battery, check engine light kept coming back. I couldn’t figure out why for the life of me and so I just caved and took it to a local Jeep mechanic. Turns out the valve needs to be reprogrammed!! Apparently for the new JL models, reprogramming is necessary unlike the JK’s.
So if you have this same issue, take it in to get reprogrammed. You can’t do it yourself because you need special access to the PCM which only mechanics and dealerships have so there’s that.

Good luck everyone and if any questions, feel free to comment.

Btw I have a 3.6 V6 6spd Manual in case anyone is having similar issues.

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[azjl#3]

warranty?

 

[58Willys]

Good info - thanks!

 

[nsurati]

warranty?

Unfortunately I have 87k miles on it already so no warranty for me. I drive too much for work. But I believe the emissions parts have an 8yr/80k warranty. Don’t quote me on it though.

 

[azjl#3]

Unfortunately I have 87k miles on it already so no warranty for me. I drive too much for work. But I believe the emissions parts have an 8yr/80k warranty. Don’t quote me on it though.

so you are out both sides? Sorry man.

I was thinking I would have a jeep as an old man. Now not too sure. Ok, im already old, but, I think the 2020 era of vehicle builds will be much like the 70's where nothing really worked on any car for more than a few years.

 

[alphawolff]

There's a PCM update for this DTC, which is what the dealer most likely did. However, I have seen the EGR cooler itself clog on these engines which throw that DTC. Just something to keep in mind if the DTC does return.

so you are out both sides? Sorry man.

I was thinking I would have a jeep as an old man. Now not too sure. Ok, im already old, but, I think the 2020 era of vehicle builds will be much like the 70's where nothing really worked on any car for more than a few years.

If you were planning to keep 2020+ jeep for life I'd strongly suggest looking into a 392. It's the only JL I'd recommend with longevity in mind. All the other engines have well documented issues. As a plus the 392 will appreciate as the years go on.

And yeah, Stellantis as a whole is going down the toilet. It's like France is stripping CDJR of all the money it can in anticipation of selling the brands off once again. I hear Auburn hills has zero ability to make decisions anymore.

 

[nsurati]

There's a PCM update for this DTC, which is what the dealer most likely did. However, I have seen the EGR cooler itself clog on these engines which throw that DTC. Just something to keep in mind if the DTC does return.



If you were planning to keep 2020+ jeep for life I'd strongly suggest looking into a 392. It's the only JL I'd recommend with longevity in mind. All the other engines have well documented issues. As a plus the 392 will appreciate as the years go on.

And yeah, Stellantis as a whole is going down the toilet. It's like France is stripping CDJR of all the money it can in anticipation of selling the brands off once again. I hear Auburn hills has zero ability to make decisions anymore.

Ok awesome, that is good to know. I know they sell a kit with the cooler too. Hopefully the valve was the main issue and nothing else gets clogged later on.

Man if only that 392 came in a manual and without all the bells and whistles I would’ve gotten that.
Hate to say it, but all this maintenance is really got me wanting a Tesla. However, I don’t think I could ever part with my Jeep, I love it too much ?. With the amount of miles I got already, might as well just make it a lifetime car. I’m just going to regularly seafoam the engine and pray nothing breaks lol.

 

[20JUR]

I have the same exact issue. P1404 . Cleaned the EGR put it back in and pulled that same code. Replaced with a new EGR cleared code by disconnecting both battery's. Pulled the code again after 15 minutes of driving. Tried clearing the code with my Tazer no Joy code popped again. I have an appointment with the dealership and they tell me $200 to flash the PCM I am assuming they will set the new EGR parameters at that time. Is there a diagnostic toll I can buy to do this myself ? Tazer and Blue driver not clearing the code. Any help would be appreciated

 

[20JUR]

Conclusion : The trip to the dealer.... I took in Customer satisfaction bulletin Y40 to see if the dealership would do the programing of the PCM. No deal they would not do it for free, but was worth a try. $185 the tech performed a Sequence EGR reset and flashed the PCM. This cleared the code witch in turn cleared the ESS trouble light. I am glad it is cleared and I did save some money and patience by replacing the EGR valve myself. I kept the original after cleaning it for a backup.

 

[nsurati]

Conclusion : The trip to the dealer.... I took in Customer satisfaction bulletin Y40 to see if the dealership would do the programing of the PCM. No deal they would not do it for free, but was worth a try. $185 the tech performed a Sequence EGR reset and flashed the PCM. This cleared the code witch in turn cleared the ESS trouble light. I am glad it is cleared and I did save some money and patience by replacing the EGR valve myself. I kept the original after cleaning it for a backup.

Sorry just seeing this now! I haven’t been on in a while. But yes, you did it right. My local mechanic had to do the same thing and had to reprogram it so you would’ve had to take it in regardless for that. Glad you got it sorted out and at least saved some money on the mechanical portion!

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