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Discussion Starter · #1 ·
i recently just bought a new tcm because i got a code for tcm failure, took it to a friends cause i was on the way there then i got another code for shift solenoids i’m hoping it’s the tcm

do all the numbers on the unit have to match the old one or no? thanks
 

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The tcm very rarely fail on P2 volvo - same for the ecm. Make first sure the connectors underneath are clean and the small cooling fan works in hot summer days after a drive. You can lift the tcm without tools, look up yt. For programming, see at the top of this blog, send these guy an email Volvo S60 XC70 XC90 S80 - Owner's/Buyer's Guide for Repairs and Maintenance Maybe also see this
 

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Discussion Starter · #6 ·
The tcm very rarely fail on P2 volvo - same for the ecm. Make first sure the connectors underneath are clean and the small cooling fan works in hot summer days after a drive. You can lift the tcm without tools, look up yt. For programming, see at the top of this blog, send these guy an email Volvo S60 XC70 XC90 S80 - Owner's/Buyer's Guide for Repairs and Maintenance Maybe also see this
do you think the alternator might have something to do with it i got mine tested because i heard from a friend that it might be that and my voltage regulator failed.
 

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do you think the alternator might have something to do with it i got mine tested because i heard from a friend that it might be that and my voltage regulator failed.
It sounds as if you don't really understand how to repair cars if you "heard from x that it might be" - this stuff can get very expensive especially if you don't know what you are doing and just attempt to replace stuff randomly hoping that will fix it. Have you considered taking your car to someone who knows what they are doing? (before you throw money away on stuff that won't fix your problem) Maybe a Volvo specialist?
 

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Discussion Starter · #8 ·
It sounds as if you don't really understand how to repair cars if you "heard from x that it might be" - this stuff can get very expensive especially if you don't know what you are doing and just attempt to replace stuff randomly hoping that will fix it. Have you considered taking your car to someone who knows what they are doing? (before you throw money away on stuff that won't fix your problem) Maybe a Volvo specialist?
i know how to fix cars i've done it plenty of times to previous cars. i was just saying because regulator is used to regulate the correct amount of voltage to the vehicle, and the code i had was shorted tcm and if the right voltage isn't getting sent around wouldn't that mean alternator
 

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i know how to fix cars i've done it plenty of times to previous cars. i was just saying because regulator is used to regulate the correct amount of voltage to the vehicle, and the code i had was shorted tcm and if the right voltage isn't getting sent around wouldn't that mean alternator
Then you should be able to easily test the charging system - What test equipment do you have? Do you have VIDA or an compatible scan tool? That would be a good first step.
 

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where do i find a vida
Vida is the factory service manual capable of everything needed for these cars. New DVD's were sent to subscription holders every 3 months through 2014. The last DVD was version 2014d. That one has info for all including the 2015.5 cars. A stolen and hacked version (eliminating the need to pay Volvo for a subscription) is easily found free on the internet. It required (when published) a win7 pro cpu with a minimum of 3gb ram and IE 9. You will need a DICE unit to interface with the car. Plugs into the obd port and a usb port on the cpu. Vida can be a pain to install and learn - but most will agree it is the best way to go.

A VIDA subscription today is online only, runs on modern operating systems, is absolutely needed for 2016+ cars or if you want/need to do a software download on any car. Info on those is at volvotechinfo.com

Aftermarket sources for the stolen version - this guy and many others might be able to help volvodiag.com
 

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For the alternator, use a multimeter at the battery posts with the engine at idle, You should see between 13.5-14.5v. If it rather shows around 12-12.5v that means the alternator is not working correctly. I don't think the regulator would fail intermittently, unless there is a wire connection issue. As for a tcm code caused by alternator or battery, hard to tell, alternator problems do cause weird electric problems, but I would expect it to have several electric issues such as weird cluster, transmission shifting and so on
 

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Discussion Starter · #14 ·
For the alternator, use a multimeter at the battery posts with the engine at idle, You should see between 13.5-14.5v. If it rather shows around 12-12.5v that means the alternator is not working correctly. I don't think the regulator would fail intermittently, unless there is a wire connection issue. As for a tcm code caused by alternator or battery, hard to tell, alternator problems do cause weird electric problems, but I would expect it to have several electric issues such as weird cluster, transmission shifting and so on
my cluster message center doesn't work and he won't let me reset my trip miles and when i got the transmission issue it wouldn't shift and on the dash where i showed what gear i'm in there was only a "-" on it and it wouldn't get out of 2nd or 3rd
 

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my cluster message center doesn't work
won't let me reset my trip miles
the transmission issue it wouldn't shift
dash where i showed what gear i'm in there was only a "-" on it and it wouldn't get out of 2nd or 3rd
Your first step would be to scan the car (all of the modules) with a compatible scan tool. That information may help point you in the right direction.
 
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