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DTC transmission codes P0756 and 70-03 A/T

Tiny
ERICA AVINA
  • MEMBER
  • 2004 ACURA TSX
  • 2.4L
  • 4 CYL
  • AUTOMATIC
  • 186,000 MILES
So I have my vehicle listed above it recently started giving me some acceleration problems. The weird thing about it is that if I turn the car off and back on it drives normally for a while until I try to go over 40 or 45. The car won't speed up and will still drive but only at a very low speed my RPMs rev high and I have to let off the gas that's when I'll pull over and turn it off and back on and it goes back to normal. I need some help figuring out what I need to replace before spending thousands on a new transmission. So I recently scanned it and got the following codes.

P0756 ACURA - Shift Solenoid 'B' Stuck Off
Dtc 70-03 A/T system malfunction
84-1 sensor logic failure
83-1Ecm/PCM relation failure code

Can anyone please guide me or help me understand what I need to repair. Thank you in advance.
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Wednesday, August 18th, 2021 AT 6:25 AM

7 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,192 POSTS
Hi,

The idea that it revs high and you can't go faster leads me to believe it is related to the shift solenoid indicated in the diagnostic trouble code.

The shift solenoid is responsible for shifting to the next gear. Basically, it's the same as if you were driving a vehicle with a manual transmission and never up-shifting. (If that makes sense LOL)

To replace the shift solenoid, you will need to remove the shift solenoid valve cover on the transmission. This will require draining the fluid, supporting the transmission, A/T cooler line brackets, and a few other things to access the solenoid.

I attached the directions for the procedure below. I highlighted the solenoid in question and an important note under it. Note that you shouldn't have to remove any of the other solenoids to replace solenoid B.

Let me know if this helps or if you have other questions.

Take care,

Joe

See pics below.
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Wednesday, August 18th, 2021 AT 1:41 PM
Tiny
ERICA AVINA
  • MEMBER
  • 5 POSTS
So then solenoid b would be the last one towards the bottom on the right correct? I just want to be sure. So I'll just disconnect the connector and remove and place new one then connect it and put everything else back together.
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Friday, August 27th, 2021 AT 7:13 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,192 POSTS
Hi,

I looked at the pic from the manual and see why you may be confused. It does appear to be the bottom right. And yes, once you remove and replace it, put it back together.

Let me know if I can help in any way. Also, if you have a chance, let me know how things work out for you. I'm interested in knowing.

Take care,

Joe
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Friday, August 27th, 2021 AT 7:30 PM
Tiny
ERICA AVINA
  • MEMBER
  • 5 POSTS
So I changed out the shift solenoid and the car was driving perfect for about 20 to 25 minutes. About the first 15 minutes it was street driven then the rest I got onto the freeway and once I hit uphill the car went back to doing the same thing and more often there were no codes and the only code I got was a 45-06 and shift malfunction. Is it time to just invest into a new transmission at this point? After believing the issue was finally gone due to it driving great I just couldn't believe it was too good to be true. :(
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Monday, August 30th, 2021 AT 12:40 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,192 POSTS
Hi,

If it was working properly, are you sure the wiring wasn't an issue? I've seen a breakdown under the insulation causing problems. One minute there is a connection and movement causes that to change.

Did you check all connections and the wiring when you did the work?

If the trans was working correctly, there is an issue either with a bad solenoid or shift valve is stuck. This repair is much cheaper than a new trans.

The code you provided, 45-06 (P1734), can be either with solenoid B or C. Your last post is the first I saw it. Do me a favor. Take a look through the diagnostics below and let me know if you are comfortable performing them. You will need a scan tool that can actuate solenoids.

Note: The first pic below shows the definition of the code, pics 2 - 4 are the diagnostics, and the last pics are advanced diagnostics.

Let me know. And again, I don't (at this point) feel the transmission is bad.

Take care,

Joe

See pics below.
Images (Click to make bigger)
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Monday, August 30th, 2021 AT 5:19 PM
Tiny
ERICA AVINA
  • MEMBER
  • 5 POSTS
Quick question. Okay, so say I buy the shift solenoid C what part number am I looking for? Because I been searching online for ever and all I see is A, B are they all the same part as long as the connectors match? Like A is brown as so is C so would an A work as C too? Because I can't find that part.
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Tuesday, August 31st, 2021 AT 9:12 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,192 POSTS
My manual isn't providing the OEM part number. However, take a look at this on eBay:

https://www.ebay.com/itm/265288568357?chn=ps&_trkparms=ispr%3D1&amdata=enc%3A1QC9rvMJcQimJZki_rRm3Xw46&norover=1&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&itemid=265288568357&targetid=1262407448140&device=c&mktype=pla&googleloc=9006104&poi=&campaignid=12875054069&mkgroupid=120167277977&rlsatarget=pla-1262407448140&abcId=9300536&merchantid=114691725&gclid=EAIaIQobChMI-piMt5Tf8gIVqNSzCh3sWQJ-EAQYBSABEgJAvvD_BwE

Everything I'm reading shows they are the same. The only way to confirm is to contact an Acura dealer.

Let me know.

Joe
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Wednesday, September 1st, 2021 AT 6:58 PM

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