felkebg

I have the 15 Z51 A8 and I have never made it to limp mode on the two times I tracked it but I sure did see the 280 mark. You definitely risk cooking your tranny at those temps. Tadge promised us a fix a long time ago but it never surfaced to my knowledge. You can get it done on your own nickel using the newer parts but at this point I am just pulling into the paddock and cutting short my sessions until I am ready to trade. It was a basic design flaw that has been corrected in later models.

The A8 has never missed a shift and I decided to let it do its job rather than paddle shift. Very fast shifts and you can just feel all of the tech working together. For me it was just one less thing to think about while getting the line down pat......

911Hunter

I read in the manual that Dexron Vl fluid is the one that we should use on our C7s. Do you know which stock fluid brand is the one that our cars come with from the dealership?

911Hunter

Which would be the best brand dextron Vl to protect the automatic transmission against overheating: Royal purple, red line, amsoil, mobil 1, Castrol or other brand?

LT4CMG

PMed you

Jay_Davis

They never released it. Another GM lie.

911Hunter

I read that even if you install GM's stock cooling upgrades, you would lose the powertrain warranty. Shame on GM.

Nexxussian

Misreplied earlier, couldn't get the computer to let me edit it without deleting, so here's my second attempt.

I understand your frustration, I would investigate which option you prefer.

You can void the rest of the warranty on the trans and torque converter with aftermarket cooling components, or maintain said warranty and potentially have the trans fail at the tail end, or just beyond what remains of your warranty.

Being a '14 that means you have what, a maximum of 730 days (2 years) left?

As I understand it the years of the warranty start from date of original sale, so possibly as little as 11.5 months.

As I recall your mileage isn't close enough to 100K to make it in the time remaining.

As it's early am here, I don't recall, have you asked your dealer if there is anything they can do?

It was marketed as a "track ready" car after all.

One option potentially means hobbling your car while waiting to get out of "warranty jail" the other promises performance now.

I'm sure you can guess which I support.

Either way, I would have a factory certified shop check it over before proceeding.

I would also check if the dealer would be willing to install the cooling upgrades, as you might be able to get some kind of extended labor warranty out of them, but you'll have to ask.

911Hunter

This is my actual warranty, since I bought certified (plus an extended warranty):

Certified Power Train Warranty - 02/20/2020 or 100,009 miles

CPO Limited Warranty - 08/19/2018 or 39,475 miles

911Hunter

Haven't checked with dealer yet, since car is behaving good on the street (besides the tracking limitation).

rmorin1249

OP: You may have to accept that A8 equipped C7s are good street cars but not so good on the track. Mine overheated at VIR during some very mild driving. Temps were in the high 80s. I gave up on any more track time.

Nexxussian

Tell them it overheated, into limp mode (IIRC I believe you said it did) and you aren't sure the converter is locking properly on the trac.

You aren't sure, are you?

If nothing else, that should make them look, they may find something.

I mention torque converter, even though it's an A6, because the biggest heater in an otherwise properly functioning auto trans is converter slip.

Obviously that's most severe with the lockup feature disengaged and the engine below the converter's stall speed.

On the track, I would expect it to not allow the engine to turn that slow, consequently any significant slip may be indicative of a TCC malfunction.

Or at least that's what I got to thinking about today.

I expect them to overheat, as they're known for it in factory trim, but yours seems excessively quick to get there.

I don't know that there was, but you could also ask if there was a software / firmware update for it that hasn't been performed yet.

CPO you'd kind of expect them to have already done that, but it's worth asking.

Not trying to tell you what to do, just suggesting as I figure it's better to have a list to "chat" with the service department about as they're human too.

What you're asking for may not connect with whomever your speaking with if you don't ask directly, they may be having a bad day.

14 z51

I tracked my car at Sebring yesterday and got put in limp mode as well. I prob won’t track my car again, but should I replace the fluid since it got up to about 280. I’m sure it has broken down and degraded a lot after getting so high in temp.

14 z51

exact same situation happened to me yesterday. How important is it to replace the fluid after it reaches temperatures that high? I’m pretty worried at this point, and not much of a mechanic.