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Jessica
Anyone have any ideas on what could be the issue, it was loud once it went into 2WD up front in the T Case, could the actuator have been stuck? Now that it works I can't really troubleshoot the switch. Any help would be greatly appreciated.
Sarah, GM Customer Service
"#25 of 115 Taho 4 WD by nikt Nov 16, 2009 (3:10 pm)
A big thanks to all who made suggestions. My 1999 Tahoe now has a correctly functioning 4WD system. If you recall, NIKT (that’s me) said that the unit was stuck in 2HI and would not engage any other mode. There were various suggestions, but here’s what worked for me:
1.- Find ATC fuse. This took longer than everything else because I kept looking for an “ATC” fuse. At least on my ’99 Tahoe, there’s no fuse so marked. My manual did list a fuse in the small fuse panel on the left side of the instrument panel, but not in the panel over the left front wheel. It’s a 20Amp fuse in the No. 2 position, and is identified as “Transfer Case.” It was blown.
2. – I pulled the T-case fuse (#2) and the Accessory Light fuse (#3) and left the car sit for about 5 minutes with the ignition switch off.
3 – I replaced the 20 Amp fuse with a 25 Amp fuse, because some people suggested that cold weather can result in a higher current draw in the 2WD-4WD shift motor. I put back the 10 Amp Accessory Light fuse which was OK.
4. – As some suggested, I then switched the ignition On and Off 5 times to clear any trouble codes stored in the Trans Control Module.
5. – I fired up the engine and watched as the red “Neutral” light on the control button panel blinked off. My Tahoe had been stuck in 2HI, but then the 4HI button lit showing that mode was now engaged. I pushed the 2HI button and the transfer case shifted OK. Out on the street I engaged all the Transfer Case modes and everything seemed to work OK.
Again, a big thanks to you all, and I hope what I did works for you too.
NIKT
Any ideas before I start to tear into this as I will be working on a budget and need to save the money by not repair or replacing what don't need to.
thanks in advance
Do you hear the noise when the wheel is lifted from the ground? Check the bearings. With the wheel up, check to see if there is a stone or screw/big nail in the tire. I have had this problem.
NIKT
The TREC fuse on mine was under hood in the fuse box above drivers fender. Clearly marked in lid diagram. Bottom right row, 2nd from Right.