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Old October 23rd, 2016, 09:42 PM   #1
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2004 V6 Transmission Problems

My '04 Accord V6 with 262k miles is having transmission issues for the first time. From what I've read on here, I've been very fortunate.

Going up a hill, the car hesitated and felt like it went into neutral when trying to shift from third to second gear. The "D" light started blinking and the car would not move. After turning the car off for about 15 minutes, it worked fine to get it home. I changed the transmission fluid, but it did the same thing again. After driving it for about 5 minutes, the car stopped pulling in any gear. It cooled down for 10 minutes and ran fine. I had a scanner hooked to it. The only code that came up was P0721 Output Speed Sensor Range/Performance. Does anyone have experience to know whether the speed sensor will help or if my transmission just needs rebuilt?

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Old October 26th, 2016, 04:54 PM   #2
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What did the drain plug look like when you changed the fluid? If it looked like a chia pet, you can bet you've got a lot of crap floating around in the transmission. And that could be why after you let it sit for a while it drives okay again. All the crap stuck to the bottom of the pump falls back down again and restores hydraulic pressure.

The sensor you talk of, I believe it determines if the car's speed matches what the transmission is doing so it really isn't something that controls it but monitors it.
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Old December 22nd, 2016, 08:49 PM   #3
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Have you ever replaced your oil pressure switches in the transmission? 3rd and 4th gear switches.
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