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2004 Volvo XC70 codes P0740 and 2x P0700

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melmaclifeform
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2004 Volvo XC70 codes P0740 and 2x P0700

Post by melmaclifeform »

Hey all,

A few months back I purchased an XC70 to drive while I attempt to piece together my S70, and it's been great until recently where it's given me a bit of trouble.

Recently on a highway trip, it was shifting quite hard and the DTC came up with a "Transmission Service Required" message along the check engine light came on. I went and had the codes read and up came three codes- P0740, P0700, and P0700 again. Upon researching the codes, I'm pretty sure it means that I need to have my TCM repaired. What do you guys think?
1999 S70- Currently in pieces
2000 S70 GLT SE- The car that helps keep oil prices up with the amount it leaks
2004 XC70 AWD- It's the wagon
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RickHaleParker
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Re: 2004 Volvo XC70 codes P0740 and 2x P0700

Post by RickHaleParker »

P0700 = "Transmission Control System Malfunction" rather vague and many things can trip an P0700 including a P0740.

P0740 = TCM-002F = Lock-up function. Slipping or not engaged.

Pull the connector to the TCM, clean the contacts, check for wiring defects. If that does not do the trick most likely you are dealing with a mechanical fault in the transmission. However before breaking out the wallet I would do a transmission fluid and filter change. Mechanical fault in the transmission is based on the assumption the fluid and filters are maintained.
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD.
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
melmaclifeform
Posts: 22
Joined: Sun Jan 13, 2019 6:45 pm
Year and Model: 1999 S70 Base
Location: North Carolina
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Re: 2004 Volvo XC70 codes P0740 and 2x P0700

Post by melmaclifeform »

Ok, sweet.

If it isn't that, here's to hoping it's a solenoid or something cheaper :/
1999 S70- Currently in pieces
2000 S70 GLT SE- The car that helps keep oil prices up with the amount it leaks
2004 XC70 AWD- It's the wagon
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E Showell
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Re: 2004 Volvo XC70 codes P0740 and 2x P0700

Post by E Showell »

Rick - don't you have to crack those trannies open to get at the filter?
'98 V70 NA FWD 5 spd, silver sand metallic (sold)
'99 V70 NA FWD Auto, dark blue (sold)
'99 S70 NA FWD Auto, black (sold and resurrected -- Don't cry for me Argentina . . . )
'07 S80 3.2 FWD Auto, Barents Blue Metallic
'06 V70 R AWD Auto, Sonic Blue Metallic
'04 XC70 Ruby Red Metallic
'95 855 auto (sold)
'86 245 manual (sold)
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RickHaleParker
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Re: 2004 Volvo XC70 codes P0740 and 2x P0700

Post by RickHaleParker »

E Showell wrote: Mon May 04, 2020 5:54 am Rick - don't you have to crack those trannies open to get at the filter?
You Spoiler :wink:
Disassembly required. He would be best off trying just a fluid change.
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD.
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
User avatar
RickHaleParker
Posts: 4976
Joined: Mon May 25, 2015 2:30 pm
Year and Model: See Signature below.
Location: Kansas
Has thanked: 3 times
Been thanked: 632 times

Re: 2004 Volvo XC70 codes P0740 and 2x P0700

Post by RickHaleParker »

melmaclifeform wrote: Sun May 03, 2020 5:04 pm If it isn't that, here's to hoping it's a solenoid or something cheaper :/
If it not the connector, you need to get a Vida-Dice scan or a scan from a better reader.
The codes your reader is producing are questionable. It is possible it is a sensor that prevents lock-up. The reader you have may not be reading all the codes or mistranslating the DTCs.
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD.
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
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