

Same problem here: 2007 Tundra VSC OFF, 4HI flashing. To cut to the chase, I opened up the center 4wd actuator top black plastic cover (5 screws) and found rust and other corrosion. Cleaned up the corrosion, sprayed everything down including connectors with electric connector cleaner spray and bingo it all worked.









So I switched the setting back to 2 wheel drive and the noise went away. As a test I switched to 4Hi and the noise came back (normal and expected); I then put it back in Auto and the noise remained. I tried this multiple times, back and forth And every time Auto is selected, I can hear the wheels engaged in 4x4.







Putting it into Neutral and rolling along did the trick. This is the first truck that I've owned with the 4x4 being all electronic. 01' Silverado Duramax 2500HD LB7. 15" Total lift (13" leaf springs) ORU SAS with 79' Ford Dana 60. 4.56 Gears Front/Rear. 41" Irok's on 17"x9" HELO HE791's. 4" AERO Turbine SS Muffler.





If the transfer case is operated in 4HI or 4LO, it will behave as a Part-Time 4WD system. If it is operated in the Auto 4WD mode, it will behave like an on-demand AWD system. This transfer case uses a clutch pack to allow for a difference in speed between the front and rear axles in the Auto-4WD mode. In the 4HI or 4LO modes, there is no ...







690 posts · Joined 2007. #2 · Mar 31, 2014. Wheel speed sensor?? Maybe a wire got cut or torn during the lift process. 2014 4Runner Limited Blizzard Pearl- Wife's. 2014 Tundra SR5 TSS Edition 5.7L. ProComp 6" lift, XD809 18x9 -12 offset, Trail Grappler 35x12.50, Hypertech Speedo Calibrator, Drivers Handle, Coachbuilder Driveline Spacer.













The front locker can only be locked after the rear has been locked. Push locker switch down once rear locker comes on. Push locker switch down again the front locker comes on. Push locker switch down again the front locker turns off. Pull up on locker switch and any locker that is on will turn off. Just google search Rubicon locker mod.



Check engine light on, 4LO flashing, and TRAC light on solid. It was parked overnight in below freezing weather, but it has been for months. It was parked in 2WD and switching between 4Hi and 4LO just made the dash beep at me as if it couldn't engage to LO. Drove it for a bit and it was definitely stuck in 4LO (electronically).







Recently I have developed a whine in my front end when I put my truck in 4Auto and 4Hi. Details: whine gets louder and higher pitch the faster I'm going. all but goes away when i let off the gas, and soon as i touch the throttle it's back. completely and immediately goes away when I switch back to 2wd. when slowing down and stopping I …



The Traction Control Light, Check Engine Light, and VSC Light (Flashing) came on this weekend. Took it to the dealership this morning and the diagnostic showed that the secondary air intake pump was bad and had water in it. They replaced free of charge as Toyota knows about the problem with the 2007 model, though it is not a recall problem. …




