These 15 SECRET GMC Functions Only 1% of Owners Know (Use Them NOW!)
Everything GMC
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📘 THE 500,000-MILE GMC BLUEPRINT
The complete maintenance system for making your gmc last past 500,000 miles. Protect against the $7,000 AFM lifter failure, service your transmission the right way, and decide repair-or-replace with cold math. No mechanic required.
👉 https://everythinggmc.gumroad.com/l/o...
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I'm Dale, twenty-eight years on the bench — twelve of them on the GM dealer side, watching delivery after delivery. The salesman pairs a phone, shows the cupholders, hands over the keys. Nobody has time to show you what the truck actually does.
These are 15 functions 99% of owners never touch. And this isn't a list for brand-new trucks only — some of these go back twenty years, and I flag which era each one applies to.
Counting down:
1️⃣5️⃣ GLOBAL WINDOW ROLL-DOWN — Hold unlock on the fob and every window drops. Vents a scorching cab before you get in. Goes back multiple generations. ⚠️ Honest note: you generally CAN'T put them back up from the fob on these trucks — that's deliberate, for safety. So don't walk away assuming the fob will close them.
1️⃣4️⃣ THE REST OF WHAT YOUR FOB DOES — Power-fold mirrors, power tailgate (and you can stop it mid-travel by pressing again), and silent panic mode on some models.
1️⃣3️⃣ REMOTE START DOES MORE THAN START IT — Climate comes on with your last settings, and below a certain temp the heated seats, heated wheel and defrosters can activate automatically. ⚠️ Myth corrected: opening a door does NOT shut a GM remote start down. What stops it is the timer, the brake pedal, or the truck detecting a problem. It runs the engine, not the ignition — doors locked, steering locked, shifter won't leave Park until someone's inside with the key. You get two cycles.
1️⃣2️⃣ RETAINED ACCESSORY POWER — Radio, windows and outlets stay live after shutdown until you open a door. Plus battery saver / load shedding, which isn't a malfunction — it's the truck protecting your battery.
1️⃣1️⃣ THE PERSONALIZATION MENU — Unlock behavior, approach lighting, startup volume, auto-lock, memory seats. It's in the driver information center under vehicle settings. (No fake button sequences here — the menu changes by year and trim.)
1️⃣0️⃣ THE HIDDEN INFO PAGES — Real numbers, not warning lights: oil pressure in PSI, battery voltage, coolant temp, instant fuel economy. A light tells you something already broke. A number tells you what's changing.
9️⃣ TRANSMISSION FLUID TEMPERATURE — If you tow, the single most valuable number on this list. Heat kills transmissions. Watch it climbing a grade and back off before you cook the fluid. No screen for it? A cheap code reader pulls it live.
8️⃣ WHAT THE OIL LIFE MONITOR ACTUALLY IS — Not a mileage countdown. An algorithm reading revolutions, temperature, run time and conditions. That's why two identical trucks show different percentages. Honest advice: if you tow, idle, or do short trips, change earlier than it says.
7️⃣ TAP SHIFT / GEAR LIMITING — Cap the top gear. On a long descent the engine holds you back instead of your brakes. On rolling terrain it stops the transmission hunting.
6️⃣ AUTO GRADE BRAKING — The truck downshifts itself on a hill to hold your speed. Owners think the transmission is failing. It's the feature working, and it's saving your brakes.
5️⃣ WHAT TOW/HAUL REALLY DOES — It does NOT add power. It changes shift points, makes shifts firmer, and turns on grade braking. ⚠️ Those firm shifts are the POINT — less clutch slip means less heat. Use it when there's weight behind you.
4️⃣ 4WD AUTO MODE — Sends torque to the front automatically when it detects slip, so you can run it on mixed conditions. ⚠️ 4-High locks the axles together and is NOT for dry pavement — that's how you bind a transfer case.
3️⃣ TEEN DRIVER / VALET MODE — Volume caps, audio muted until belts are buckled, and a report card with top speed and hard-braking events. Valet locks the glovebox and console with a PIN.
2️⃣ THE TRAILERING & CAMERA SUITE (newer trucks) — Saved trailer profiles, a pre-departure light check you can do alone, trailer tire pressure AND temperature, brake gain, hitch guidance, bed view, transparent trailer view.
1️⃣ G80 — YOU MIGHT ALREADY HAVE A LOCKING DIFFERENTIAL — No button. No switch. No light. It just works when a wheel spins. That's why nobody knows they have it. Open your glovebox, find the RPO sticker, and scan it for G80. If it's there, you own a locking rear differential — and you've been driving on traction you never knew about.
The RPO sticker tells you what you actually have — not the trim badge, not the brochure, not what the salesman said.
Go try three of these today. Which one did you not know about? Drop it in the comments.
#GMC #GMCTrucks #GMCSierra #HiddenFeatures #G80 #TowHaul #TruckTips #RPOCode #CarTips #EverythingGMC
5 Comments
These 15 SECRET GMC Functions Only 1% of Owners Know (Use Them NOW!)
Everything GMC
33,274 views
📘 THE 500,000-MILE GMC BLUEPRINT
The complete maintenance system for making your gmc last past 500,000 miles. Protect against the $7,000 AFM lifter failure, service your transmission the right way, and decide repair-or-replace with cold math. No mechanic required.
👉 https://everythinggmc.gumroad.com/l/o...
━━━━━━━━━━━━━━━━━━━━━━━━━━━
I'm Dale, twenty-eight years on the bench — twelve of them on the GM dealer side, watching delivery after delivery. The salesman pairs a phone, shows the cupholders, hands over the keys. Nobody has time to show you what the truck actually does.
These are 15 functions 99% of owners never touch. And this isn't a list for brand-new trucks only — some of these go back twenty years, and I flag which era each one applies to.
Counting down:
1️⃣5️⃣ GLOBAL WINDOW ROLL-DOWN — Hold unlock on the fob and every window drops. Vents a scorching cab before you get in. Goes back multiple generations. ⚠️ Honest note: you generally CAN'T put them back up from the fob on these trucks — that's deliberate, for safety. So don't walk away assuming the fob will close them.
1️⃣4️⃣ THE REST OF WHAT YOUR FOB DOES — Power-fold mirrors, power tailgate (and you can stop it mid-travel by pressing again), and silent panic mode on some models.
1️⃣3️⃣ REMOTE START DOES MORE THAN START IT — Climate comes on with your last settings, and below a certain temp the heated seats, heated wheel and defrosters can activate automatically. ⚠️ Myth corrected: opening a door does NOT shut a GM remote start down. What stops it is the timer, the brake pedal, or the truck detecting a problem. It runs the engine, not the ignition — doors locked, steering locked, shifter won't leave Park until someone's inside with the key. You get two cycles.
1️⃣2️⃣ RETAINED ACCESSORY POWER — Radio, windows and outlets stay live after shutdown until you open a door. Plus battery saver / load shedding, which isn't a malfunction — it's the truck protecting your battery.
1️⃣1️⃣ THE PERSONALIZATION MENU — Unlock behavior, approach lighting, startup volume, auto-lock, memory seats. It's in the driver information center under vehicle settings. (No fake button sequences here — the menu changes by year and trim.)
1️⃣0️⃣ THE HIDDEN INFO PAGES — Real numbers, not warning lights: oil pressure in PSI, battery voltage, coolant temp, instant fuel economy. A light tells you something already broke. A number tells you what's changing.
9️⃣ TRANSMISSION FLUID TEMPERATURE — If you tow, the single most valuable number on this list. Heat kills transmissions. Watch it climbing a grade and back off before you cook the fluid. No screen for it? A cheap code reader pulls it live.
8️⃣ WHAT THE OIL LIFE MONITOR ACTUALLY IS — Not a mileage countdown. An algorithm reading revolutions, temperature, run time and conditions. That's why two identical trucks show different percentages. Honest advice: if you tow, idle, or do short trips, change earlier than it says.
7️⃣ TAP SHIFT / GEAR LIMITING — Cap the top gear. On a long descent the engine holds you back instead of your brakes. On rolling terrain it stops the transmission hunting.
6️⃣ AUTO GRADE BRAKING — The truck downshifts itself on a hill to hold your speed. Owners think the transmission is failing. It's the feature working, and it's saving your brakes.
5️⃣ WHAT TOW/HAUL REALLY DOES — It does NOT add power. It changes shift points, makes shifts firmer, and turns on grade braking. ⚠️ Those firm shifts are the POINT — less clutch slip means less heat. Use it when there's weight behind you.
4️⃣ 4WD AUTO MODE — Sends torque to the front automatically when it detects slip, so you can run it on mixed conditions. ⚠️ 4-High locks the axles together and is NOT for dry pavement — that's how you bind a transfer case.
3️⃣ TEEN DRIVER / VALET MODE — Volume caps, audio muted until belts are buckled, and a report card with top speed and hard-braking events. Valet locks the glovebox and console with a PIN.
2️⃣ THE TRAILERING & CAMERA SUITE (newer trucks) — Saved trailer profiles, a pre-departure light check you can do alone, trailer tire pressure AND temperature, brake gain, hitch guidance, bed view, transparent trailer view.
1️⃣ G80 — YOU MIGHT ALREADY HAVE A LOCKING DIFFERENTIAL — No button. No switch. No light. It just works when a wheel spins. That's why nobody knows they have it. Open your glovebox, find the RPO sticker, and scan it for G80. If it's there, you own a locking rear differential — and you've been driving on traction you never knew about.
The RPO sticker tells you what you actually have — not the trim badge, not the brochure, not what the salesman said.
Go try three of these today. Which one did you not know about? Drop it in the comments.
#GMC #GMCTrucks #GMCSierra #HiddenFeatures #G80 #TowHaul #TruckTips #RPOCode #CarTips #EverythingGMC
"The 500,000-Mile GMC Blueprint" covers the real service intervals, how to protect your 5.3L/6.2L from a $7,000 AFM lifter failure, the transmission rules that save a $4,000 rebuild, and how to spot a bad used truck before you buy. No mechanic, no lift, no special tools.
Instant PDF: https://everythinggmc.gumroad.com/l/oxfwl