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My 2007 X, that I just got home over the weekend ( just bought) has a P0847 code, showing in diagnostic message folder. WE are still learning about all the bells and whistles (Tech/Ent packages).

Is this something serious? I know it has to do with a transmission sensor. The dealer is 55 miles away and a terrible commute to boot.

How concerned should I be? Should I take it back, or is it something like adding more tranny fluid...it does not leak. It has 25K miles. I don't notice any problems with it shifting.

Is there anyplace where I can get the meanings for all the codes?

Thanks,
Mike
 

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Splasher - I just had the same code come up in my 07 MDX. Did you take it to the dealer? what was the outcome/damages? Thanks!

midnightMDX - is this something that can be repaired/replaced by a non-acura dealer mechanic? I dread taking my vehicle to the dealer and getting charged an arm and a leg for something that is a "simple" fix. Thanks.
 

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midnightMDX - is this something that can be repaired/replaced by a non-acura dealer mechanic? I dread taking my vehicle to the dealer and getting charged an arm and a leg for something that is a "simple" fix. Thanks.
Are you out of warranty?
 

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I have just about 62k miles, so I'm still well within the 70k powertrain warranty. I called Acura today to check, and they said that this should fall under the the powertrain. So it seems like it should work out, and I really need to get this taken care of ASAP since I use the MDX for work. I am actually at the dealership now. I'll let you know what happens.
 

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Are you out of warranty?
Yes, this was covered under the 6yr/70k mile powertrain warranty. A sensor for one of the transmission gears was bad. From what they described, it was a simple fix. Since it was under warranty, my receipt had no prices. Here's what the invoice said:

"Retrieved code P0847. Third gear trans pressure switch failure. Tech replaced third gear pressure switch to correct condition. Failed part #AC28610.... AC90471"
 

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3rd clutch pressure switch has been a pretty common failure on the 2007+ model.
Are there any other common part failures with the '07 MDX that could lead to drivetrain failure? Or is there a thread somewhere already on here with a list about common failures? I have about 8k miles left on my warranty, it would be good to knock it all out before I have to pay out of pocket. Thanks.
 

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Just got this error message today. Wife was complaining about engine noise that would come every now and then. Would that be a symptom of this issue? Just bought this car as a "certified vehicle" less than 3 weeks ago. Freaking dealership! Current 55K miles but I do have extended warrant to 100K so I'm glad it's happening now at least.
 

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khamkhao - sorry so late reply. I hardly check this email. Anyways, there wasn't any "noise" associated with this error code. The MDX seemed to run fine. Like I mentioned in my previous post, it was just a simple fix of replacing a sensor/switch. Hope you got this fixed.
 

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I just got the p0847 error code today. I didnt notice that anything drove that bad, but it did feel a little sluggish and I could hear an occasional metal sound like a heat shield was loose underneath. Its at the dealer now.

If they fix the switch, and whatever is making the heat shield noise, is there any other damage caused by this condition?
 

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I just had this issue, same as the other posters. 08 MDX Tech has 63k. No prior trans issues (coils, but that is OT for this thread). There was "indecision" at about 40 mph with the truck being driven gently. One hill nearby would show this indecision well, with odd shifting up hill and "grabbing" gears downhill. This is mama's car, so she'd often tell me "it doesn't feel right". We've had manual trans cars for the last 10 years, so I had no comparisons.

While driving at 30 mph very gently, the Satnav goes off and tosses P0847. I get to the dealer next day, who diagnoses it as "replace 3rd gear pressure switch". After $170.00 non powertrain warranty dollars, I'm on my way. Apparently a switch attached to the powertrain is not part of the powertrain. (Acura's idea of warranty is much different than BMW's idea of warranty-also OT for this thread).

The trans now shifts cleanly. I think it may also have been reset or reprogrammed, as it now holds high gear longer than before...this is not a problem, just an observation. The shift points and feel are different now other than just the 3rd gear thing.

I hope this isn't an ongoing thing. I dread my dealership and have a good independent who knows Honda, but some things you still need the stealership for.
 

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Powertrain?? Or not???

Curious - one dealership did the repair under warranty and the other didn't. Which is right? I just paid for the repair tonight, and it doesn't seem right to me. Anyone here able to confirm if the switch is a powertrain item?:mad:
 

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Curious - one dealership did the repair under warranty and the other didn't. Which is right? I just paid for the repair tonight, and it doesn't seem right to me. Anyone here able to confirm if the switch is a powertrain item?:mad:
If you are under the 50k, it is warranty, if under 70k, then it is NOT, but it is under the 70k "powertrain warranty". I just had a torque converter replaced under warranty at 68k, after a discussion where the dealer tried to charge me $2400 for the TC....I reminded him that the TC is an "internally lubricated part", unlike the switch they charged me for....even though the switch is attached to a transmission....not internally lubricated. Dealer claimed he saw I was out of warranty, (true) and didn't have the extended warranty (true and a mistake on my part...but I THOUGHT this was a Honda), so he intended to charge me. That I had to remind them of the powertrain warranty may have been an error on the service writer's part, or not.............

On the plus side, with a new TC and the DW-1 trans fluid, it is smooth again and shifts nicely.....:29:
 

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Switch not covered.

Thanks for the information, Speedlaw. 51K when I bought the vehicle. I am also aware of the TC issue, but the dealership said it doesn't appear to be the case. But I'll watch that one like a hawk!

Like you, I opted not to take the extended warranty: I have a 2004 Accord and I've never had a problem with it. Perhaps a false sense of security. Given that the TC issue is fairly well documented, it may make sense to get it to be sure.

Thanks again for your input. I'm sure others will appreciate it as well.

Kevin
 

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Cold transmission vs. Hot transmission

OK - I had the sensor switch replaced ($250) and it seems to eliminate the pulsing between 1500-1800 rpm at 42 mph. Here is what I notice -

Cold start (after sitting the night in the garage/air temp is @ 43 degrees F): backing out, my wife sometimes hears a noise (she hasn't described it well enough for me to confirm). Today, I heard nothing. I put it in D and proceeded out of the driveway and down the road a short way; no noise. I got to the main road and accelerated normally through the gears. At 40-50 mph, I coud hear what sounds like transmission lugging and I can feel a buzz in the gas pedal with my foot. I can corrolate a buzz in the pedal with a slight rise in RPMs (200-500 rpms). I drove it about 3 miles to the on ramp to the highway. I gave it gas and wound it out to about 75 mph and backed off. I drove about another 12 miles to the store.

I shopped for about an hour.

With the vehicle warmed up, I drove the back roads to the highway. Speeds between 35-45 on the back roads with a few stops and starts for traffic lights. No buzzing in the pedal, no lugging, no problems. The vehicle drove perfectly as far as I could tell.

Have any of you in this thread experienced anything similar? Is there a cold vs warm/hot thing going on here, or maybe it has something to do with the Torque Converter rather than reaching operating temperature? Any/all help or thoughts appreciated. I'm trying to diagnose this thing before the powertrain warranty expires.
 

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This just popped up for me as well. Everything feels fine. The way the light comes on, it seems like you should bring it in right away. But it seems like it's just an electrical issue, not a mechanical one. I'm trying to figure out if I should bring it to a dealer or a mom n pops Honda/acura dealer near me.
 

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Code P0847: Transmission fluid pressure sensor/switch "B" circuit low

Part Number: 28610, $36.93

Seems to be a fairly inexpensive part, has anyone attempted to fix this themselves? Below is the tranny diagram with the part clearly identified.

 

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This just happened on the 08 with 70500 miles. May attempt the repair myself. I'll have to check the manual.
 
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