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Hi Folks,

Hoping to get some help. Symptoms are that 40-50% of the time when I start my 2004 V6 Touareg I get the Brake Assist Workshop message. It is always accompanied by the ABS light. Shutting off and restarting almost always results in no BAW error and no ABS light. VERY occasionally I get a 'fishtail' where the rear end darts a bit, often when going around a corner. I don't notice any grinding noise from the rear end, and no tire scrubbing. My VAGCOM scan is below. My TReg has the locking rear diff.

I've read a dozen or more threads on similar problems, I gather than this is often a rear stepper motor, or a center stepper motor? Sometimes a ABS sensor? My first action was to check and replace the battery, I'm confident that I have good voltage. Dealer diagnosed it as "Faulty Differential Control Motor, fault is for differential mech malfuntion" and quoted me $4300 to replace the entire rear diff.

My question: any way to confirm that it is in fact the rear stepper motor before spending $$ on that spendy part? Advice on part number and best place to buy?

VAGCOM scan (items with no faults removed for brevity)

Tuesday,22,September,2015,08:25:35:06926
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 8 x64
VCDS Version: 15.7.1.0 (x64)
Data version: 20150904
Ross-Tech: Home

VIN: WVGBC77L44D06xxxx License Plate:
Mileage: 135850km-84413mi Repair Order: afterclear

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Chassis Type: 7L (7L - VW Touareg (2003 > 11/2006))
Scan: 01 02 03 05 06 08 09 11 13 15 16 17 18 19 1C 22 29 32 34 36
37 39 3C 46 47 55 56 57 64 65 68 69 6C 6D 6E 75 76 77

VIN: WVGBC77L44D06xxxx Mileage: 135850km-84413miles
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Address 03: ABS Brakes Labels: 7L0-907-379-MK25.lbl
Part No: 7L0 907 379 D
Component: ESP ALLRAD MK25 0108
Coding: 0014593
Shop #: WSC 31414 000 00000
VCID: 3A7B6702764497EE53-5140

1 Fault Found:
02054 - Control Module for Differential Locks (J647)
013 - Check DTC Memory - Intermittent

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Address 32: Differential Locks Labels: None
Part No: 0AC 927 771 D
Component: SG-Quersperre 5023
Shop #: WSC 00000 000 00000
VCID: 3979780E73429CF65A-5140

1 Fault Found:
02412 - Differential Lock Rear
003 - Mechanical Failure - Intermittent

-------------------------------------------------------------------------------
End-------------------------(Elapsed Time: 08:21)--------------------------

Thanks in advance for any advice.
 

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Take it in to Fix-Um-Haus on Lombard St in Portland and get their opinion on what it will take to make it right. They are long time supporters of TDIclub and are fair.
 
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