Shift Lever. See Automatic Transmission on page 9-33. Tow/Haul Selector Button (If See Tow/Haul Mode on page 9-39. Range Selection Mode (If Equipped). See Manual Mode on page 9-36. 10. Light Sensor. See Automatic Headlamp System on page 6-3. 11. GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Black plate (4,1) Mexico The 6L80E is foremost an economy enhancing transmission. Gears 5 and 6 are overdriven. If placed in manual mode 5 it will lock out AFM. As a test you can use this M5 as a AFM lockout to compare with the V8 - V4 - V8 switching in 6th. This is a good test to run in town in traffic. When the parking brake is applied and the transmission is left in gear, it will automatically shift to neutral after four minutes to reduce the load on the drive train The transmission has travelled a mere 60K km's Superchips is thrilled to announce that the transmission tuning is now supported on the Flashpaq for 2015-2016 GMC and Chevrolet trucks equipped with the 8 speed transmission The +/- buttons don't actually shift the gears, they select the highest gear allowed. So, putting it in L and selecting 4, the trans will start in 1 and shift up normally to 4 and no higher. So, hitting - should get you a lower gear (assuming you're in the top gear allowed), but hitting + won't necessarily get you and up shift. R rbarrios The transmission options that were available to the 2005 Sierra were as follows: MG5 - This is the NV3500 manual transmission. It's the only manual available for the 2005 Sierra. M32 - This will be the 4L65E transmission, which is an upgraded version of the 4L60E. M30 - This is the 4L60E automatic transmission. It came in the lighter The 2010 GMC Terrain has 1 problems reported for manual shift switch stopped working. Average failure mileage is 39,000 miles. CarComplaints.com : Car complaints, car problems and defect information Sierra's 12,500-lb rating requires Sierra Double Cab or Crew Cab Short box 2wd with 6.2L EcoTec3 V8 engine and NHT Max Trailering Package. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner's Manual. The weight of passengers, cargo and options or accessories may reduce the amount you can tow. Traction Select System adjusts Sierra Limited's transmission shift points, throttle mapping and StabiliTrak ® to optimize performance for the situation. The available modes in the Traction Select System are: Tour Sport† Terrain (available on 4WD models with single-speed transfer case) Snow (2WD models only) Tow/Haul Off Road 17,303 Posts. #3 · Aug 16, 2016. The government forced CAFE is your problem. I have the same 6 speed and usually "around town" legal speed is 30 mph. My truck wants to be in 6th gear and V4 mode most of the time. 5th gear is overdrive, 6 th gear is the 2nd overdrive. 30 mph in overdrive!!!!!!! You wouldn't drive a manual that way. Basically the Internal Mode Switch appeared to be the culprit by the P182e DTC code. The other 2 were just 'followup' codes cause of the P182e code. Inspect the automatic transmission manual shift shaft position switch, harness, AT4X versions of the GMC Sierra and Canyon. NEW! 20+ members. Chevy Silverado EV Forum 1K+ members GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-9955992) - 2017 - crc - 4/18/17 Shift Lever. See Automatic Transmission 0 283. Tow/Haul Selector Button (If Equipped). See Tow/Haul Mode 0 288. Range Selection Mode (If Eq