The car is already at a garage, but the mechanic is apparently fairly booked, and I wonder if anybody wants to guess at how bad this is? The automatic transmission on my friend’s 2008 Pontiac G6 GT Convertible went out on him at work about a week ago. Transmission fluid is full…actually too full. I…

The radiator leaked into the transmission cooler and filled the trans with coolant. Rebuilt trans, new radiator, fresh coolant. Parts… $2200, Labor… maybe another $1500. This is a rough guess. A 16 year old car in ??? condition with ??? miles… might not be worth the repair cost.

First guess would be the clutches are shot or the converter. At any rate needs to go to a transmission shop. Either way if the converter goes, it can send debris through the transmission so has to come apart anyway. When I had the 30,000 mile fluid change done on my G6, the shop said an overhaul …

With transmission “too full” I’ll go with @Mustangman 's guess. What does the fluid look like? It should be red and largely translucent. If it looks more like strawberry milkshake, then the trans is doomed.

What color is the coolant? If the tranny cooler leaked, the coolant would be contaminated with transmission fluid. [Transmissin-fluid-and-coolant-mix] Tester

My guess, the owner put more trans fluid in hoping that would solve some symptoms. Such a thing might work, for a while anyway. At this point however I’m thinking the trans seals have hardened and leaking (internally) under pressure. Faulty shifting is the result, as high hydraulic pressure is …

Re-read the post but didn’t see anything related to the cooler leaking. Just looked over filled which might be normal since it has to be hot and in park after engaging all the gears. Plus does that have a dio stick in 08? Forward clutches could be shot but still have reverse clutch which might in…

[image] bing: Just looked over filled How did it GET overfilled? No mention. My guess was coolant from radiator. Testers was trans fluid to the coolant… either way bad things are happening.

What engine is in the vehicle, I’m show 2 different 4 speed autos (4T45E & 4T65E) and one 6 speed auto (6T70), they are all fully electronically controlled and should throw a code anytime the it is not working right, may just need a better scanner…

Cooler bursting in the rad on the Cobalt with the 4T45E is the reason why I am dealing with it’s crap now, or part of it anyway… The 4T45E trans does not have a dip stick, but the other 2 transmissions show to have one, the 4T65E should have a dipstick tube and stick, the 6T70 should have a cap wit…

Hey, thanks for all the replies! Some more details. The automatic transmission fluid seemed okay to me. I wondered if being over-full was a clue, but would have mentioned if it looked off. It’s too late to check the coolant reservoir, as the car is now at the garage about 17 miles away, but that wa…

2008 Pontiac G6 automatic transmission

Maintenance/Repairs

db4690 April 11, 2024, 12:29pm 18

and what would this code be?

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2008 Pontiac G6 automatic transmission

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