Recirculation Mode Press Recirculation Mode to quickly cool the air inside the vehicle or prevent outside odors from entering the vehicle. Note: When the Recirculation Mode is used without air conditioning, the air humidity increases and the windows may fog. See Climate Controls in your Owner Manual. Defog Mode Defrost Mode TEMP Recirculation Mode If I shift into Manual mode it acts as if the truck is in Drive, the 1-6 never comes up and the +/- button does nothing. Everything else works fine, and the truck is stock except 4inch turbo back, and the ppe airbox mod 2007.5 GMT-900 Chevrolet Silverado 2500HD CC/LB LTZ 4x4 Summit White. 4-18-2007. Powered by the LMM Duramax 365hp/660tq 2wd to 4wd auto or 4wd lock - shift at any legal speed (I keep it below 50mph). No need to shift to neutral, but foot off the accelerator is recommended. From 4wd lock, to 4lo - slow to a roll below 5 mph. Shift transmission to neutral, then shift T-case to lo. Once T-case has shifted, put transmission back to drive. The manual mode will not work long as the shifter is in the D position. Must be moved to the next lower position and then press the + button for up-shift and the - button for downshift. 2003 Chevrolet Silverado 2500HD; Open Questions: 0 answers. 2011 duramax diesel leaking antifreeze. Read full answer. If you want to drive in manual mode, you can shift to the next gear at around 2,500 rpm as you accelerate. For faster acceleration, rev higher. For better fuel economy, shift at a lower rpm like 2,000 to 2,100. The transmission works nicely going back & forth from auto to manual mode & back. I use manual mode for some certain hills then flick Manual shift mode not working on 2010 1500. My 2010 Sierra 1500 with the 5.3 and 6 speed trans has the manual mode on the column shifter with buttons, but does not manually shift or change at all when put into that mode. Any ideas as to what might be wrong? Still indicates that it is in manual mode on the dash but pressing shift buttons has no Silverado 1500 LT 5.3L. I have a 2014 Chevy Silverado 4x4 5.3 with 135,206 miles on it. When driving 45 to 80 mph, the transmission shifts from 6th to 5th gear about every 2 to 3 seconds. if you A P182E, hard shift, no PRNDL display condition on the vehicles listed below can be caused by a faulty internal mode switch. The internal mode switch is the new name for what we used to call the park/neutral switch, which was then changed to transmission range selector. P182E: Internal Mode Switch Indicates Invalid Range using "l" (manual mode) what you're doing is setting the highest gear that you'll let the transmission shift into, so you can downshift by setting the lowest gear to ones lower than you're already in and you can pseudo-upshift by hitting the "+" on the shifter to set the next highest gear once you get to the rpm that you want to shift at, but it … When you press the switch you're making a "request" of the BCM to shift the trans. It will check your speed and current gear, then look up numbers in a table to find out if you're allowed to shift or not, then execute a shift if allowed. G gruelens Registered Joined Feb 25, 2015 10 Posts Discussion Starter · #3 · Jul 11, 2015 DrivenDaily said: When it worked you could go into manual mode and shift with the tap button up or down, which I found handy if you were heading down a hill and even going up to stop the tranny from constantly changing gears. The manual mode still works- say you are d