2004 V70, TCM-012C Error

Bassius · Post by **Bassius** » 14 Jun 2016, 02:13

Hey Guys,

First of all, credits for this forum/website. Lots of good DIY tutorials which convinced me to register here (as well).

I've also asked my question on Volvoforums.org.uk, but since there's a lot of people with knowhow of the AW55-50's here, perhaps you can shed some more light on my problem!

I'm driving a 2004 V70 D5, FWD with the AW55-50SN gearbox since about a year. Ever since I bought it, there was a slight stuttering when accelerating slowly and decelerating towards a roundabout for example. Coming from an old 244 with BW55 transmission I was used to that and didn't think too much of it.

The issue became more noticable though and I decided to do a flush. We used the correct oil (3309 from Mobil) and the old oil was quite bad (dark black...).

For a shortwhile it seemed better, until recently it started to stutter again and in notime I was back to square one. Last friday (when I got married even...) a warning light came on: Transmission Service Required and it went into some emergency loop (wouldn't shift properly from standing still), didn't indicate what gear in etc. etc.

I was able to read the fault codes today (had to install a laptop), and I'm getting a TCM-012C and an additional ECM5310 communication with TCM error (probably consequence of the TCM Error).

Basically the error described that there could be a problem with Solenoid SLS, which pretty much matches the stories I've been reading so far. However considering the description "Neutral Control Engine Flare", I am wondering if I am having one of those old transmissions that needs new software ?

Otherwise - should replacing the valvebody with a remanufactured one resolve my problem?

Cheers,

Post by **abscate** » 14 Jun 2016, 05:01

I believe the problem year was 2001 with this transmission, and by 2004 things were better.

Post by **chrism** » 14 Jun 2016, 07:52

After what I've recently experienced with throttle control errors and the ECM, I would be inclined to pull the TCM loose and re-seat it just in case the problem is simply a bad connection. A special tool is required to release either the ECM or the TCM but a well-versed Volvo mechanic will have that tool. It's a five minute job and requires no new parts. This may not be the problem but it's worth a try.

nsjames · Post by **nsjames** » 14 Jun 2016, 08:10

ohm out the solenoids.

sonnax has a good document about the solenoids testing
http://intertransparts.com/assets/niss_ ... zip-in.pdf

01_Nautic_V70 · Post by **01_Nautic_V70** » 14 Jun 2016, 08:55

Yes, starting by resistance checking the solenoids. Can be done from the Trans to body connectors just forward of the airbox.

Bassius · Post by **Bassius** » 14 Jun 2016, 13:47

Alright, I'll see what I can figure out!

Note though that there was an issue present with the gearbox, but that the warning light itself is a new thing. Is the TCM detachable with normal garage tools? None of my friends have the special 'Volvo' tools, but are skilled mechanics though.

Also, about measuring the resistance on the solenoids. I'm assuming this can be done without the car running right? I found the connectors in front of the air filter, between the filter and the headlights on a small frame. Initially I removed the entire filter as mentioned in VIDA, but no connectors were on the box itself.

nsjames · Post by **nsjames** » 14 Jun 2016, 14:23

yes, you turn off the car.