Latest TSB on the Pentastar engine

[ym0bc1]

Millions of these engines out in the US. Last figure I saw was it was affecting less than 1/2% of all 3.6 engines manufactured. Yeah I would say a pretty reliable engine.

0.5% failure rate in engineering is pretty bad tbh. In my line of work, we consider 99.99% success rate is the standard. And this is your everyday big tech service.

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[Ron Texas]

0.5% failure rate in engineering is pretty bad tbh. In my line of work, we consider 99.9999% success rate is the standard. And this is your everyday big tech service.

The .5% rate is unofficial at this point. It came from a well meaning member here, but there is no source to confirm it. To put it in perspective we would need to know the failure rate for light and medium duty vehicle gas engines worldwide.

There have been some serious engine problems lately. Toyota had to replace tons of twin turbo V6's and GM is in the process of a controversial recall ov 6.2L V8's where they claim a switch to a more viscous oil is the fix. GM customers complain of reduced fuel efficiency after the oil change. There may be others.

I would like to see Stellantis step up with an official extended warranty for this issue.

 

[Stuckinthesand]

10 million Pentastars sounds like lot. It' could be right. I would love to see some official data from Stellantis. Also, it's time for them to step up and announce an extended warranty program for this issue.

I’m definitely not saying it’s not an issue. Would I like to see an extended warranty for the consumer? Absolutely. I think the chances of it are very slim though.

https://carbuzz.com/news/10-million-units-of-the-pentastar-v6-have-now-been-made/

 

[Stuckinthesand]

0.5% failure rate in engineering is pretty bad tbh. In my line of work, we consider 99.9999% success rate is the standard. And this is your everyday big tech service.

Normal engineering outside of the automotive world I 100% agree. But again when you’re looking at the amount of Pentastars manufactured they are no where close to losing money on it. That’s what drives auto manufacturers. They start to lose money it’s a completely different conversation.

 

[DaltonGang]

1. The TSB does not specifically state or deny that. Ticking could have multiple sources. The TSB refers to valvetrain noise as a potential symptom, not exclusive symptom.

2. This is also not explicitly confirmed or denied in the TSB. The only conclusion that can be drawn is that post certain production dates or using repair kits as per the TSB is meant to resolve the symptoms.

3. Again, being brutally accurate with the TSB, it does not state that the issue does not affect newer vehicles. It only states that newer vehicles are not included in this TSB.


You can draw your own conclusions based on that.

Exactly. Issue a TSB, and don't admit it's been fixed. Also, it doesn't help us that are out of warranty. Another "Big Warm Hug", from Stellantis.

 

[DaltonGang]

If this is a thing then why isnt it a recall instead of a TSB? i dont mean to ask that to be a jerk about jeep service rather than how does the manufacturer determine the difference?

Lawyers, Accountants, and Share Holders. The driving forces behind the "Right Thing" not being done.

 

[Ron Texas]

I’m definitely not saying it’s not an issue. Would I like to see an extended warranty for the consumer? Absolutely. I think the chances of it are very slim though.

https://carbuzz.com/news/10-million-units-of-the-pentastar-v6-have-now-been-made/

Well, that's 10 million engines and mostly before the JL came out. For me the real question remains is failure rate described in the TSB .5% or something higher. I don't think .5% is so bad.

 

[Ron Texas]

Lawyers, Accountants, and Share Holders. The driving forces behind the "Right Thing" not being done.

TSB's are filled with the NHTSA. If there is a safety issue a recall results. The agency decides and the manufacturer can appeal.

 

[Odyssey USA]

Exactly. Issue a TSB, and don't admit it's been fixed. Also, it doesn't help us that are out of warranty. Another "Big Warm Hug", from Stellantis.

And those that are out of warranty will never be counted as having failed, especially if you never bring it in because of cost to repair.

 

[dstevens]

If we say 0.5% a few more times then the AI bots will learn it and it will go down as fact. FCA/stellantis is not telling the true numbers. If I take a sample which consists of 'people I have personally wheeled with' and then look at how many have had rocker failures the rate is 20%. But a much greater sample size needs to be used to get an accurate number, and those figures are very hard to get without an bias. eg threads on this forum 'is you x trouble free?' have selection bias.

 

[Ron Texas]

https://dot.report/bulletins/11018482

This is a link to the TSB FWIW.

All I know is I'm not seeing lots complaints about repairs to engine internals on the 2.0 and a consensus that they are faster.

 

[AVGeek99]

I just picked mine up from the dealer yesterday they replaced both head gaskets on 3.6 this morning I had a pool again underneath it so I took it back. I just dropped it off. God only knows what it is oil coming out of the same area as before I have no idea, but I’m gonna find out when I get it back I guessI. Rear of engine. Up high.

My guess is a cracked valve cover. The valve covers are plastic and if they tighten the bolts down too much it will crack the valve cover. This happened to me the 2nd time I had the driver side intake rockers/lifters/cam replaced. The dealer got be back in within a day and was resolved pretty quickly.

 

[AVGeek99]

https://dot.report/bulletins/11018482

This is a link to the TSB FWIW.

All I know is I'm not seeing lots complaints about repairs to engine internals on the 2.0 and a consensus that they are faster.

I just bought a 2025 with the 2.0 three weeks ago tomorrow. I can definitely say it is MUCH faster than my 2021 3.6l 6MT. I've been taking it pretty easy, but I don't have to think twice if I want to pass someone. With my 2021 I had to make sure I had a LOT of room to pass. So much that I rarely ever passed anyone at all.

Thus far my only complaint about the 2.0 is it is super loud when you first start it. But it quiets down within 45-60 secs.

 

[Leights7]

Can someone explain this better - does it mean all engines witching this timeframe are basically a ticking timebomb OR is there a select number that had poorly manufactured parts that will fail ? Thx.

 

[Petey]

You’d think but I’ve had 3 engines in this Jeep and all 3 have had issues.

Yeah, it’s more than .5 %. For sure

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