READ BEFORE FLASHING. Put a REAL high-quality battery charger on the truck at 12V / 15A and keep voltage above 12.5V for the entire flash — never use a jump box. If voltage drops below 12.5V, ECM damage can occur; do not flash under 12.5V. Use fresh batteries (under ~12 months old — battery quality has dropped hard since 2020, and older batteries may not hold flashing voltage).
Steps
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3
Use fresh batteries
Make sure your batteries are newer — under about 12 months old. Since 2020, the average battery only holds proper tuning voltage for around a year, so older batteries may not sustain the voltage a flash needs.
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4
Unplug aftermarket accessories
Unplug any aftermarket accessories and pull their fuses before you begin.
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5
Put a battery charger on the truck
Connect a real, high-quality battery charger set to 12V and 15A to keep voltage above 12.5V while flashing. Do not use a jump box. If volts drop below 12.5V, ECM damage can occur — do not flash if under 12.5V.
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6
Tune before removing any parts
Always tune the truck before removing parts — don't remove anything until tuning is complete. Be gentle with every hardware and cable connection: don't force anything, make sure each plug is fully seated, and double-check everything before programming.