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skinny 02-22-2005, 01:02 AM I just bought a 2001 d/a and when I start it sometimes the service 4wd light flashes for a second. I look for it when I first turn the key on (glow plugs) but it never illuminates until after the motor starts. Is this normal or is something wrong. I have access to a new snap-on MODIS scantool and found no codes. Thanks for responses in advance. Cobra#3747 02-22-2005, 09:18 AM push button 4 wheel drive? skinny 02-22-2005, 06:34 PM Yeah its the push button. Cobra#3747 02-22-2005, 06:36 PM You have to be able to scan the transfercase control module. What year is the truck? We had some problems with switches, some just need a software update. skinny 02-22-2005, 06:58 PM Its a 2001, I do have the option to scan the transfer case but there were no codes. Are software updates a warranty item or something I would have to pay for if I take to a dealer? Cobra#3747 02-22-2005, 07:31 PM That update would be a 3/36 coverage. Usually the switch sets a B2725 | ||