EngineGo

Your 6.7L Power Stroke already makes serious torque from the factory. A custom tune is how many owners get sharper throttle response, cleaner shifts, and more towing confidence out of it. The questions that come up before checkout are rarely about the tune alone. Owners ask how long a custom file takes, how much power is realistic, whether the transmission and fuel system can handle it, and what the legal picture looks like.

This guide covers 2011 through 2026 Super Duty trucks. If you are already comparing options, the 6.7 Power Stroke tuner collection is sorted by year so you can check fitment first.

The Auto Agent 3 plugs in within a minute. The flash is the step that deserves your attention. A weak battery, a dropped connection, or the wrong file can turn a simple job into a long afternoon with the truck sitting.

This guide walks through setup from order to first flash for Ford Power Stroke, Ram Cummins, and GM Duramax trucks. It also covers the checks that prevent most problems. If you have not picked a package yet, start with a look at the diesel tuner and match your year, engine, and transmission first.

If your diesel has an EGR system, it has an EGR cooler. Most owners never think about it until a check engine light or a coolant problem shows up. This guide explains what the cooler does, what Ford and GM have documented about how it fails, and how to confirm the cooler is the cause before you spend money on parts.

If you own or are shopping for a 2011 to 2016 Silverado or Sierra 2500HD or 3500HD with the 6.6L LML Duramax, you have probably heard one name over and over: CP4.2. That pump is the biggest risk on this engine. It is not the only thing worth knowing about, and it is not a reason to skip the truck.

This guide covers what actually goes wrong on the LML, what GM's own service bulletins say about it, and what to check before you spend money on a purchase or a modification.

Fitment note: The LML is the pickup version of this engine for 2011 to 2016 (8th VIN digit "8"). GM also built a detuned LGH version (8th VIN digit "L") for chassis cab, box-delete trucks, and Express and Savana vans. The fuel pump bulletin and the settlement below touch both, but parts and tuning are not always interchangeable. If you are not sure which engine code your truck has, check the RPO code or send us your VIN before ordering parts.

If you own or are shopping for a 2017 to 2023 Silverado or Sierra 2500HD or 3500HD with the 6.6L L5P Duramax, the short version is good news. GM redesigned this engine from the block up, and it fixed the biggest failure point the LML had. That does not mean the L5P has no issues. A few are documented in GM's own service bulletins and recalls, and they are worth knowing before you buy, tune, or modify.

This guide sticks to what GM and NHTSA have published, so you know what to check first.

Fitment note: The L5P is the engine in 2017 to 2023 Silverado and Sierra 2500HD and 3500HD pickups. GM also sells an L5D version in the Silverado 4500HD, 5500HD, and 6500HD, and some bulletins cover both. Parts and tuning are not always interchangeable between pickup, chassis cab, and box-delete trucks. If you are not sure which engine code or configuration your truck has, send us your VIN before ordering parts.

Most EZ Lynk mix-ups start before the truck is plugged in. An owner buys the Auto Agent 3, expects it to change how the truck runs, and learns the device alone does not do that. The tune comes from a tuner, the package has to match the exact truck, and a few model years need extra hardware first.

This guide covers what the Auto Agent 3 does, what is included and what is not, and how to match a package to your Ford Power Stroke, Ram Cummins, or GM Duramax before you order.