Rear Locker Failure Update

[Mountain4x4]

Back from the dealer last night, new rear diff installed. Still no technical conclusions other then a mechanical failure. However, after the dealership had the first road lock they were able to repeat it consistently, so the problem would have grown worse. A few thoughts;

1. Be sure to know the warning signs as this could be dangerous. Extremely long delays getting the rear locker out. Say 10 minutes or more off road, rolling backwards, taking it out of center lock does not seem to get it done. And and chirp of tires on road especially with dash lights on a turn.
2. yes, its rare. HOWEVER, 2 more have cropped up since mine in October. 1 other in Colorado and 1 in Illinois. So while not wide spread yet, we now have 3.
3. Cost according to dealer to replace complete rear end 14,780.00. However parts are available to fix the mechanism, but the dealers have no technical direction yet and Ineos needs to understand the problem.
4. Initially only a little metal in diff, but dealer did another diff fluid change while diagnosing and the fluid became dirty right away. So again, verifies a bigger issue was coming.
5. Diff came from Belgium, total time from diagnosis, claim approval and fix about 6 weeks.

Currently this is a rare occurrence and we have no idea where it will go. So just be aware. If it becomes widespread it will have to be a safety recall like the drive shaft issue will have to be.

 

[cyson]

Wow. $14780... That's nuts.

 

[Tazzieman]

@Mountain4x4 could ypu pls link back to your original post?

 

[Mountain4x4]

https://www.theineosforum.com/threads/front-drive-shaft-update.12418127/post-1333367963

That was I think my original post under Drive Shaft Failure, as it failed on the way home as well. I might add they did check every single connector, despite being an obvious mechanical problem. I do find it interesting my invoice does not show warranty denied on drive shaft, just that I rejected them replacing it on my dime.

 

[Old Hokie]

Back from the dealer last night, new rear diff installed. Still no technical conclusions other then a mechanical failure. However, after the dealership had the first road lock they were able to repeat it consistently, so the problem would have grown worse. A few thoughts;

1. Be sure to know the warning signs as this could be dangerous. Extremely long delays getting the rear locker out. Say 10 minutes or more off road, rolling backwards, taking it out of center lock does not seem to get it done. And and chirp of tires on road especially with dash lights on a turn.
2. yes, its rare. HOWEVER, 2 more have cropped up since mine in October. 1 other in Colorado and 1 in Illinois. So while not wide spread yet, we now have 3.
3. Cost according to dealer to replace complete rear end 14,780.00. However parts are available to fix the mechanism, but the dealers have no technical direction yet and Ineos needs to understand the problem.
4. Initially only a little metal in diff, but dealer did another diff fluid change while diagnosing and the fluid became dirty right away. So again, verifies a bigger issue was coming.
5. Diff came from Belgium, total time from diagnosis, claim approval and fix about 6 weeks.

Currently this is a rare occurrence and we have no idea where it will go. So just be aware. If it becomes widespread it will have to be a safety recall like the drive shaft issue will

Back from the dealer last night, new rear diff installed. Still no technical conclusions other then a mechanical failure. However, after the dealership had the first road lock they were able to repeat it consistently, so the problem would have grown worse. A few thoughts;

1. Be sure to know the warning signs as this could be dangerous. Extremely long delays getting the rear locker out. Say 10 minutes or more off road, rolling backwards, taking it out of center lock does not seem to get it done. And and chirp of tires on road especially with dash lights on a turn.
2. yes, its rare. HOWEVER, 2 more have cropped up since mine in October. 1 other in Colorado and 1 in Illinois. So while not wide spread yet, we now have 3.
3. Cost according to dealer to replace complete rear end 14,780.00. However parts are available to fix the mechanism, but the dealers have no technical direction yet and Ineos needs to understand the problem.
4. Initially only a little metal in diff, but dealer did another diff fluid change while diagnosing and the fluid became dirty right away. So again, verifies a bigger issue was coming.
5. Diff came from Belgium, total time from diagnosis, claim approval and fix about 6 weeks.

Currently this is a rare occurrence and we have no idea where it will go. So just be aware. If it becomes widespread it will have to be a safety recall like the drive shaft issue will have to be.

Back from the dealer last night, new rear diff installed. Still no technical conclusions other then a mechanical failure. However, after the dealership had the first road lock they were able to repeat it consistently, so the problem would have grown worse. A few thoughts;

1. Be sure to know the warning signs as this could be dangerous. Extremely long delays getting the rear locker out. Say 10 minutes or more off road, rolling backwards, taking it out of center lock does not seem to get it done. And and chirp of tires on road especially with dash lights on a turn.
2. yes, its rare. HOWEVER, 2 more have cropped up since mine in October. 1 other in Colorado and 1 in Illinois. So while not wide spread yet, we now have 3.
3. Cost according to dealer to replace complete rear end 14,780.00. However parts are available to fix the mechanism, but the dealers have no technical direction yet and Ineos needs to understand the problem.
4. Initially only a little metal in diff, but dealer did another diff fluid change while diagnosing and the fluid became dirty right away. So again, verifies a bigger issue was coming.
5. Diff came from Belgium, total time from diagnosis, claim approval and fix about 6 weeks.

Currently this is a rare occurrence and we have no idea where it will go. So just be aware. If it becomes widespread it will have to be a safety recall like the drive shaft issue will have to be.

Back from the dealer last night, new rear diff installed. Still no technical conclusions other then a mechanical failure. However, after the dealership had the first road lock they were able to repeat it consistently, so the problem would have grown worse. A few thoughts;

1. Be sure to know the warning signs as this could be dangerous. Extremely long delays getting the rear locker out. Say 10 minutes or more off road, rolling backwards, taking it out of center lock does not seem to get it done. And and chirp of tires on road especially with dash lights on a turn.
2. yes, its rare. HOWEVER, 2 more have cropped up since mine in October. 1 other in Colorado and 1 in Illinois. So while not wide spread yet, we now have 3.
3. Cost according to dealer to replace complete rear end 14,780.00. However parts are available to fix the mechanism, but the dealers have no technical direction yet and Ineos needs to understand the problem.
4. Initially only a little metal in diff, but dealer did another diff fluid change while diagnosing and the fluid became dirty right away. So again, verifies a bigger issue was coming.
5. Diff came from Belgium, total time from diagnosis, claim approval and fix about 6 weeks.

Currently this is a rare occurrence and we have no idea where it will go. So just be aware. If it becomes widespread it will have to be a safety recall like the drive shaft issue will have to be.

Back from the dealer last night, new rear diff installed. Still no technical conclusions other then a mechanical failure. However, after the dealership had the first road lock they were able to repeat it consistently, so the problem would have grown worse. A few thoughts;

1. Be sure to know the warning signs as this could be dangerous. Extremely long delays getting the rear locker out. Say 10 minutes or more off road, rolling backwards, taking it out of center lock does not seem to get it done. And and chirp of tires on road especially with dash lights on a turn.
2. yes, its rare. HOWEVER, 2 more have cropped up since mine in October. 1 other in Colorado and 1 in Illinois. So while not wide spread yet, we now have 3.
3. Cost according to dealer to replace complete rear end 14,780.00. However parts are available to fix the mechanism, but the dealers have no technical direction yet and Ineos needs to understand the problem.
4. Initially only a little metal in diff, but dealer did another diff fluid change while diagnosing and the fluid became dirty right away. So again, verifies a bigger issue was coming.
5. Diff came from Belgium, total time from diagnosis, claim approval and fix about 6 weeks.

Currently this is a rare occurrence and we have no idea where it will go. So just be aware. If it becomes widespread it will have to be a safety recall like the drive shaft issue will have to be.

Back from the dealer last night, new rear diff installed. Still no technical conclusions other then a mechanical failure. However, after the dealership had the first road lock they were able to repeat it consistently, so the problem would have grown worse. A few thoughts;

1. Be sure to know the warning signs as this could be dangerous. Extremely long delays getting the rear locker out. Say 10 minutes or more off road, rolling backwards, taking it out of center lock does not seem to get it done. And and chirp of tires on road especially with dash lights on a turn.
2. yes, its rare. HOWEVER, 2 more have cropped up since mine in October. 1 other in Colorado and 1 in Illinois. So while not wide spread yet, we now have 3.
3. Cost according to dealer to replace complete rear end 14,780.00. However parts are available to fix the mechanism, but the dealers have no technical direction yet and Ineos needs to understand the problem.
4. Initially only a little metal in diff, but dealer did another diff fluid change while diagnosing and the fluid became dirty right away. So again, verifies a bigger issue was coming.
5. Diff came from Belgium, total time from diagnosis, claim approval and fix about 6 weeks.

Currently this is a rare occurrence and we have no idea where it will go. So just be aware. If it becomes widespread it will have to be a safety recall like the drive shaft issue will have to be.

My Grenadier has been at my dealer for 2+ weeks now with the exact same problem. It is a 2024 with 23,000 miles and has been dealer serviced at 10,000 and 22,000 miles.
The dealer reported that they have been able to replicate that the rear diff lock is engaging randomly. The dealer reported this to INEOS and confirmed to them that the rear diff fluid was replaced at 10,000 miles as required.
The last dealer update is that they are waiting on direction from INEOS. It sounds like replacing the whole rear end assembly is the fix.
This issue also started with a delayed light off unlock confirmation and progressed to random rear diff locking and all the associated warning lights. The first few times the rear diff would disengage after a couple miles but quickly progressed to more consistent and prolonged locking. I then parked it and arranged thru INEOS roadside assistance to have it hauled to the dealer.
I will contact the dealer Monday and ask about a complete rear end replacement.

 

[Mountain4x4]

Uh oh, your not Illinois or Colorado...so we have a 4th. Still a small sampling. At some point they will start repairing these to save money. Mine was supposed to be the one to study, they sure don't need 4. Funny though other failures seem to be more consistent then mine was. Not sure if smashing it around off road makes the difference, or more likely I dodged a bullet driving it 800 plus miles after the problem.

 

[Zimm]

Mine is currently at the dealer, (2 weeks). Oddly we both came to the conclusion it was the center diff that was locking up. It happens in the cold, and only in the first mile, after that it frees up. We are thinking its the center, because, I've had both front and rear tires chirp, and if I hit the circular bridge ramp first thing in the morning, the truck would detect the wheel speed as an issue (slide) and interrupt power. I have not heard from RDS in a week, they were waiting on INEOS input.