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STILL DECIDING? WE CAN HELP 800-708-0087
STILL DECIDING? WE CAN HELP 800-708-0087
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Monster 6L80 replacement programming
Choose your year, we’ll show the right device.
Start with your model year. You’ll get a clear recommendation (2 credits for 2007–2016, 4 credits for 2017+), plus the full step-by-step instructions and FAQs below.
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Start here
Enter your vehicle model year
We’ll recommend the correct credit option automatically.
Recommendation: Enter your year above.
Waiting for year…
2
Waiting on year
Buy the recommended device
Once your year is entered, we’ll show one clear “Shop Now” option.
No invite code needed. Devices are pre-assigned to Monster and auto-link when plugged into the vehicle.
Step-by-step instructions
Jump to FAQsFollow this exact flow: READ → INSTALL → WRITE. Use a 20 Amp battery charger during read/write to prevent voltage drop. On the WRITE step: long-press WRITE and select Full Write (required to program the TCM properly).
READ (before removing the old 6L80)
This captures the current vehicle file so we can generate the updated file.
- Vehicle in PARK, parking brake set.
- Connect a battery charger.
- Plug device into OBD-II.
- Open app and complete READ/upload.
INSTALL
Complete the mechanical install before writing the updated file.
- Install the replacement 6L80.
- Verify connectors and grounds.
- Fill fluid to spec and check for leaks.
WRITE (after install)
Write the updated file returned in the app (often within minutes of the read).
- Battery supported, plug into OBD-II.
- Select the returned updated file.
- IMPORTANT: Long-press WRITE and choose Full Write. If you do not choose Full Write, it will not write the TCM properly.
- Note: Full Write will write the entire ECM as well.
- Do not interrupt the write process.
- Follow any prompts (ignition cycle, etc.).
More detailed instructions (recommended)
Keep the vehicle voltage stable and don’t unplug the device during active read/write steps. If something fails, the most common causes are low voltage or connection issues.
- WRITE selection matters: long-press WRITE and choose Full Write — this is required to write the TCM properly. Full Write also writes the entire ECM.
- Low voltage: connect a charger/maintainer and retry.
- Connection: stay close to the device and use stable service/Wi-Fi.
- Need help: call 800-708-0087.
In-depth FAQs
Back to top2007–2016 vehicles use 2 credits. 2017+ vehicles use 4 credits. Enter your year at the top for a clear recommendation.
No. Monster devices are pre-assigned and auto-link when plugged into the vehicle.
Do the read before removing the old 6L80. That baseline file is used to generate the updated file.
Typically within minutes after the read completes (timing can vary based on connection and vehicle).
Yes. On the WRITE step, you must long-press WRITE and select Full Write.
If you do not choose Full Write, it will not write the TCM properly.
Note: Full Write will write the entire ECM as well.
Note: Full Write will write the entire ECM as well.
No. The device plugs into OBD-II and the workflow is handled through your phone and the app.
Voltage drop during read/write can cause failures. Stable voltage greatly improves success rate.
Call Monster at 800-708-0087 and we’ll walk you through the next step.