tranny slipping when cold?

[G-ZUS]

My friend has a 99 Accord V6 automatic, the transmission only slips when it is cold, but when it warms up it doesn't slip anymore? Is his tranny on the way out?

[anomaly2]

check the tranny fluid possible low

[Grogador]

...but don't just fill it up willy-nilly. Personally I'd take it in somewhere trustworthy for a fluid flush/topup and to pull codes from it, as it could be a worn clutch pack or valve thingy. This is how the slushy in my ole Chrysler beater started crapping out, neglect on my part finished it off :)

[HK2NR]

D4 or TCS light blinking? 6th gen accord trannies are known for this... and it may be an early sign that its on its way out. Try changing out the tranny fluid, 3 x drain and fill with ~3quarts. That should change out 95% of the oil. Never flush this transmission.

[inline6turbo]

Change out the fluid and add some Lucas Tranny Fix. I did this and the problem pretty much went away. It's reallllyy thick stuff though so try to do it in a warm place and warm up the bottle first a little.