Azeem Syed

So here it goes. Just purchased an 05 RL with 200k miles. The price and service history enticed me enough to make the move. Its been through 3 timing belts/water pumps, few brake jobs and routine maint. stuff at a local honda dealer so i was convinced after getting the party down to $2,500. All great stuff.

Day 1, the trans fluid was very dark in color. I didnt like it so went and picked up some Honda ATF at a local dealer. Brought it home and replaced it for the first time. Not a flush through the cooling lines, just a regular drain and fill. Took a little over 3 quarts or so and about 30 minutes of my time. Plan was to cycle this over the course of the next 6 months or so. Synth engine oil changed myself during the same time though I dont see anything engine can be related to this issue.

2nd day into the ownership, im driving home from work commute ~ 60 miles or so one way and nearby my house the speedo stops working. Then the check emissions message invokes followed by a CEL and then the VSA light. Onboard system conveys a P0741 message. Checked my fluid level and normal temp and its right where it needs to be (just below the top dot of the dip).

Shes shifting all over the place looking for gears, loud thumps at times (especially around turns), and no speedo. Cluster is lit up like a Christmas tree. Ive done a little research and something tells me i should brace myself for a major expense right away. Im pretty mechanically inclined and own an NA1 NSX as well. Irrelevant to this but point is I miss my manual gear box now

Any recommendations/advise is welcome from similar use cases/RCA's. Thank you in advance. Im new here so eventually ill get to creating my profile completely.

deepa1600

How old is the battery? Usually bad battery can cause all the electrical problems you are having. Try changing 3rd and 4th gear pressure switches for transmission.

projektvertx

iTrader: (2)

The face that there is no speed reading almost makes me tilt towards a bad transmission output speed sensor. Not to be confused with the speed sensors at each wheel, those are for the ABS! I had a similar situation with my old Camry where my speedo stopped working. turns out it was the transmission output shaft speed sensor that was malfunctioning. Didn't throw a code in that car, but with so many electronics in this car, I'm not surprised it threw a bunch of codes.

https://www.partsgeek.com/gbproducts...RoC1fsQAvD_BwE

Azeem Syed

I havent checked the battery really. Ill put it on the list and see what kind of readings i get. I dont see/notice any evidence of a charging system failure, from the surface at least.

Where are the pressure switches located? Im assuming its exterior to the transmission casing itself? Links? Thank you for your reply

Azeem Syed

Sure, ill get a reading from the output speed sensor as well. Thank you for your input!

deepa1600

https://www.acuraoemparts.com/v-2006...ensor-solenoid
it's no 11 (2 of them) and 12 (only 1) make sure you buy washers as well.

Azeem Syed

Thanks, ill have a look

TonyCD

deepa1600 is onto the first thing you should check. Search the forum and you'll find the battery is a cause of many, many electrical gremlins that you'd never guess it could cause. The battery on these cars is a weak point – I think they spec'd it undersize to save weight on an already porky 4,100 pound midsize car – and it can cause misbehavior even if it's not quite weak enough yet to test out as a faillure.

As for the transmission fluid, you did a good thing. Now do it twice more. Drain and fill, run a few miles through the gears to circulate, lather, rinse, repeat – the procedure known as 3+3. You'll replace over 90% of the fluid that way. No need to wait weeks or months to do so.

RL Row

That sounds as if the alternator has gone bad. Has it been replaced?

TonyCD

Here's a description of what happened when my alternator croaked. Total time from first onset of symptoms to death was approximately 1 hour. https://acurazine.com/forums/second-...rnator-953409/

Continue

It may be your alternator or battery, but chances are it's your output speed sensor.