Superchips Flashpaq Tuner with ECM Unlock for 2020-2023 Silverado and Sierra 2500HD 3500HD 6.6L L8T Gas - 2866-F

The Superchips 2866-F is a tuner kit for 2020-2023 Chevrolet Silverado and GMC Sierra 2500HD and 3500HD trucks with the 6.6L L8T gas V8. It pairs the Flashpaq handheld with the locksmith unlock device and an ECM harness, so you unlock the factory-locked ECM with the module still in the truck and tune in the driveway.

Preloaded tunes for 87 octane and premium deliver up to 28 rear-wheel horsepower and 50 lb-ft on premium, with a performance calibration for the 6-speed automatic. On a truck that tows, the transmission tune and the added torque are the improvements you notice first.

Vehicle compatibility

• 2020-2023 Chevrolet Silverado 2500HD and 3500HD with the 6.6L L8T gas V8
• 2020-2023 GMC Sierra 2500HD and 3500HD with the 6.6L L8T gas V8
• The same unlock hardware is sold with DiabloSport handhelds and monitors: Predator 2 7266-R, inTune i3 8266-R and Trinity 2 9266-R

Tuning and adjustment features

• ECM unlock hardware included; unlock and tune at home without removing the ECM
• Preloaded 87 octane and premium tunes with a performance 6-speed TCM tune
• Speedometer correction for tire size and final drive ratio
• Rev limiter, idle RPM in Drive and Neutral, speed limiter removal, throttle sensitivity
• Recall last drive mode, front and rear TPMS thresholds
• Service functions: transmission adaptive relearn, crank position sensor relearn, intake filter monitor control
• Live data monitoring, read and clear trouble codes

What is in the box

• Flashpaq handheld
• Locksmith unlock device
• ECM unlock harness
• OBD-II and USB cables
• Instructions

Installation and limitations

The ECM must be unlocked once before the Flashpaq can tune the truck. Connect the locksmith through the supplied harness, complete the unlock, then tune through the OBD-II port. After that the locksmith and harness are no longer needed. The device locks to one VIN, and once the ECM has been unlocked the unit is non-returnable.

Specifications

• Part number: 2866-F
• Brand: Superchips
• Warranty: 1 year manufacturer warranty
• Country of origin: United States
• Packaged size: 6 x 5 x 3 in, 2 lb
• UPC: 810065217417

Frequently asked questions

Do I have to pull the ECM?

No. The harness connects to the ECM in the truck and the unlock is done in the driveway.

How much power does it add?

Superchips publishes up to 28 rwhp and 50 lb-ft over stock on premium fuel.

Can I return it after unlocking?

No. The ECM unlock cannot be undone, so once it has been performed the kit is not returnable. The tune itself can be returned to stock.

Is this for the Duramax?

No. This kit is for the 6.6L L8T gas engine only.