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By GMCustomerService · Posted
We understand that intermittent AC concerns are inconvenient, @tjonesdfw, especially since they often do not show themselves when we want or need them to. We would like the opportunity to learn more about your experience with your Sierra and explore the best path of assistance moving forward. To begin, please visit: https://s.gmc.com/support-request and fill out the support request form with all pertinent details. This form helps our team gather the right information and ensures your request is routed appropriately. -
By GMCustomerService · Posted
We want you to have full confidence in your Silverado, @ceeemcgeee. Safety is our utmost priority, and we understand your concern after this experience. We would like to provide an added layer of assistance between you and your dealer as we pursue the resolutions of your transmission concerns. When you have a moment, we would like to learn more about your experience so we may explore the best path of assistance moving forward. Please visit: https://s.chevy.com/support-request and fill out the support request form with all pertinent details. This form helps our team gather the right information and ensures your request is routed appropriately. -
Disclosure: BlueV8 is a Supporting Vendor and sells plug-in AFM/DFM disablers. Before you spend a dime with us — or with anyone — try the AFM disabler GM already built into your truck. It's the shifter, and it's free. ⏱ The 10-second version 🚫 Skip the M5 method if: Most of your miles are highway — M5 locks out 6th gear, so you cruise at higher RPM and burn more fuel You already know you'll forget — it only works if you do it every single drive Your lifters are already ticking — nothing that switches AFM off repairs existing damage You already run a tune or disabler — this would be doing the same job twice ✅ Worth trying if: You want AFM off today, for exactly $0 You want to test-drive V8-only life before buying anything Your driving is mostly town and short trips, where 6th gear barely matters Your truck is leased or under warranty and you won't touch the ECM — this is zero hardware, zero software 💡 The whole trick, in one paragraph Owners across GM forums keep reporting the same pattern: put the transmission in manual / range-select mode, pick M5 or lower, and AFM never activates — the truck stays in V8 the whole drive. Bump it up to M6 and V4 mode comes right back. Two of the cleaner threads on it are here and here. GM has never documented this behavior, so file it under "strong owner consensus," not gospel. The good news: it takes exactly one drive to verify on your own truck. Steps below. What "free" actually costs Effort, every drive. It's a routine, not a setting. Shift to M, tap up to 5, every time you get in. There is no set-and-forget here. 6th gear. When GM shipped trucks with AFM/DFM switched off during the 2021 chip shortage, its own estimate of the penalty was about 1 MPG — and those trucks kept every gear. In M5 you're also giving up overdrive, so expect the highway hit to be bigger than that. Patience. One Tahoe owner ran the L5 routine for two months, then got tired of it and bought a plug-in disabler — he had an extended warranty, so flashing a tune was off the table. That's not a knock on the method. That's just what month two feels like. I put together the full instructions, limitations, and links to the original owner discussions here: https://www.bluev8.com/blogs/news/how-to-disable-afm-for-free-the-m5-method -
Disclosure: BlueV8 is a Supporting Vendor and we sell AFM/DFM disablers. We wrote this because not every GM owner actually needs one. In some cases, regular maintenance, towing use, an existing tune, or simply using M5 makes another device unnecessary. ⏱ The 10-second version 🚫 Skip it if… You keep the oil full and change it every ~5,000 miles. Your risk is already low. You're happy shifting into M5 every drive. That disables AFM for free. Your truck tows heavy most days. AFM barely runs under load. You already run a tune or delete kit. Done is done. It's already ticking or misfiring. You need a mechanic, not a plug-in. ✅ Worth it if… You bought it used and the oil history is a mystery. Checking the dipstick is… not your hobby. (No judgment.) You're a long-term keeper with lots of easy highway miles — exactly when AFM runs most. The V4 drone and shudder drive you nuts. You're under warranty, so a tune is off the table. The full article includes the supporting GM bulletins and owner reports: https://www.bluev8.com/blogs/news/do-you-actually-need-an-afm-disabler
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It`s magnetic so it`s not main or rod bearings. I would pop off a valve cover or 2 and take a good look at the rocker arms. See if you can see if any needle bearings are coming apart.
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