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Old 04-16-2019, 02:41 PM   #1
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flashing 4th and D Tiptronic

2002 tip, 986 S with 80K

Flashing 4th and D after warm up, however transmission works fine and the normal lights come back in a minute or so, go to 4th and D again, etc as I drive. Automatic and manual function fine, just dont get the feedback in the dash lights when its out.

I have heard this could be the transmissionís coolant vacuum valve. Does this circulate coolant through the transmission? That seems to be the simple fix and makes sense.

I had the transmission serviced, new fluid, filter etc about 6 months ago, but the problem didn't completely resolve. Now with the warmer weather, I'm thinking I should iron out this issue.
I have a durametric scanner, but it only shows alarm fault codes (historic, none present now) to be honest, I am not sure I'm using the durametric to its potential, it seems pretty lame when I do the short test on all modules, so I would welcome advice on this as well.

would a faulty coolant vacuum valve potentially lead to heat issues with the tiptronic, manifesting in the 4th and D flashing?
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Old 04-16-2019, 02:51 PM   #2
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Curious, have you changed the exhaust system on the car? Especially putting in secondary cat delete pipes?
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Old 04-17-2019, 05:20 AM   #3
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Quote:
Originally Posted by KRAM36 View Post
Curious, have you changed the exhaust system on the car? Especially putting in secondary cat delete pipes?
nope, stock exhaust and wondering if the cooling system is integrated with the tranny for cooling and replacing the coolant vacuum valve would assist in cooling transmission.
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Old 04-17-2019, 05:51 AM   #4
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Originally Posted by tonythetiger View Post
2002 tip, 986 S with 80K

Flashing 4th and D after warm up, however transmission works fine and the normal lights come back in a minute or so, go to 4th and D again, etc as I drive. Automatic and manual function fine, just dont get the feedback in the dash lights when its out.

I have heard this could be the transmissionís coolant vacuum valve. Does this circulate coolant through the transmission? That seems to be the simple fix and makes sense.

I had the transmission serviced, new fluid, filter etc about 6 months ago, but the problem didn't completely resolve. Now with the warmer weather, I'm thinking I should iron out this issue.
I have a durametric scanner, but it only shows alarm fault codes (historic, none present now) to be honest, I am not sure I'm using the durametric to its potential, it seems pretty lame when I do the short test on all modules, so I would welcome advice on this as well.

would a faulty coolant vacuum valve potentially lead to heat issues with the tiptronic, manifesting in the 4th and D flashing?

That controls the coolant that goes to the trans cooler mounted on the transmission.
Mine broke in half and car had to be towed it's only time. It's also a lot of fun to replace, it's the same type of valve that controls coolant to the heater. Valve is not very expensive.
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