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'Gear Selector Service Required' and TCM-DD01

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive "P2" platform cars.

2001 - 2007 V70
2004 - 2007 V70 R
2001 - 2007 XC-70
2001 - 2009 S60
2003 - 2007 S60 R

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'Gear Selector Service Required' and TCM-DD01

Post by Kara503 » Thu Sep 12, 2019 9:07 pm

2006 S60R, auto transmission.
No OBDII codes stored, info display reads 'Gear Selector Service Required'.

Tried a new GSM (Gear selector module, the circuit board that lives under the shift knob)- no change.
The lights on the shifter are never lit. the car shifts normally but with no geartronic function.
The car behaves the same whether I plug the GSM in or leave it unplugged, and this the same with the original module.

ViDA gives me the code TCM-DD01 and fault tracing tells me to check the signal inputs with a special Volvo tool I don't have, then tells me to replace the GSM.

Any thoughts on how I should proceed? Should I just assume the original module plus the one I got from the scrap yard are bad?

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Re: 'Gear Selector Service Required' and TCM-DD01

Post by RickHaleParker » Thu Sep 12, 2019 10:06 pm

TCM-DD01 The communication lead between the gear selector module (GSM) and the transmission control module (TCM) is short-circuited to voltage or ground.

Check the wiring between the GSM and the TCM.

Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

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