My first mechanical failure on the 3.0

[Pro299]

Well, not a major 'failure', but still. Took the XL in for an oil change and the tech found oil on the front of the pan area. It was hard to tell from underneath because of the splash guard, but sure enough there was a mist of oil on the passenger side. Turns out the front crank seal is leaking. Under warranty, it's no biggie, but 10.5 hours of shop time would be unwelcome news later on. I'm assuming this is an outlier due to a faulty seal since I haven't seen it mentioned by anybody else.

 

[StephenPT]

Early LM2's had an issue where the lip of the rear main seal rolled during installation at the factory. There's a TSB out there and I believe it only applies to '20 thru '21 Pickups and SUVs. GM issued a new part number for the rear timing cover and seal, which included a tool to help guide the seal and keep it from rolling over the edge during install.

Your issue is the first time I've heard of a front crank seal leaking... :/

3.0 Duramax Rear main seal

I've been reading some posts on here about other people's rear main seal failing, I was just wondering if anyone got it fixed then it happened again not even 1000kms later. Story: Anyone else have an issue with the main rear seal in the 3.0 Duramaxs? GM knows about the issue as there is a...

www.duramaxforum.com

 

[Seamus]

What year is your truck.

 

[CTown Duramax]

Well, not a major 'failure', but still. Took the XL in for an oil change and the tech found oil on the front of the pan area. It was hard to tell from underneath because of the splash guard, but sure enough there was a mist of oil on the passenger side. Turns out the front crank seal is leaking. Under warranty, it's no biggie, but 10.5 hours of shop time would be unwelcome news later on. I'm assuming this is an outlier due to a faulty seal since I haven't seen it mentioned by anybody else.

Hi,
Can you please give me the TSB or service bulletin, if you have it?

 

[Pro299]

No TSB, just a random seal failure. Maybe an out of spec part, or maybe damage during assembly, don't know. Warranty covered it and no one else has reported similar, so I guess I just drew the short straw.

 

[OR VietVet]

What year is your truck.

Time and time again, vehicle complaints with no vehicle info. It is a secret.

 

[CTown Duramax]

Ooops. I just took the time to look at StephenPT's link. https://gm-techlink.com/?p=14641 This is a detailed GM posting on "TechLink", apparently a GM website. It does not say that there is a defect. Rather, it says "Some 2020-2021 Silverado, Sierra; 2021 Tahoe, Suburban, Yukon and Escalade models equipped with the 3.0L diesel engine (RPO LM2) may have an oil leak concern and DTC P06DD (Engine Oil Pressure Control Valve Performance) may be set. These conditions may occur if the rear main oil seal has moved or is severely shifted out of position in the timing chain lower cover." So there might be other reasons for this, such as service performed incorrectly, but it does not rule out that some LM2's may have this problem.