Unlock GPEC2A ECUs for OBD Tuning with KESS3
Free unlock. Same-day tuning.
KESS3 users can now unlock and patch GPEC2A ECUs on the bench, enabling full OBD tuning for popular platforms including Dodge Hellcat, RAM, and Jeep.
The unlock is completely free as part of your existing KESS3 subscription. Once the ECU is patched on the bench, it becomes fully OBD-programmable, meaning faster turnaround and same-day tuning.
There are no additional protocols or activation fees, making this the perfect time to invest in KESS3 if you’re expanding your tuning services.
To help tuners implement this new capability quickly and confidently, Simon White (VIEZU Technical Director) has prepared a step-by-step tutorial showing the full bench process.
Step-by-step unlock process
Once patched, GPEC2A ECUs can be tuned via OBD as often as required. The bench unlock procedure includes:
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Safe ECU disassembly
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CNF1 boot point cleaning
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Bench wiring and grounding
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Using a pogo pin and BDM frame
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Executing patch with KESS3
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Final reseal and ECU prep for OBD access
Bench setup and tool tips
Simon White shares expert wiring tips in the video:
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Use a labelled Bench mode cable for GPEC2A
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Apply correct BOOT-line resistance (KESS3)
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Use a non-slip bench or clamp for secure contact
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Always back up the ECU before patching
Watch Simon White’s full tutorial on YouTube for a complete walkthrough, including wiring tips and real workshop footage.
A great time to purchase KESS3
This unlock process is designed specifically for Alitentech KESS3, and it’s the tool we recommend. However, similar methods are also possible using:
Who should act now
- Tuning workshops looking to support more US vehicles
- Existing KESS3 users who haven’t added this ECU yet
- New tuners ready to invest in a tool with high-value protocols
This update is a strong reason to upgrade now. With no licence cost and high vehicle coverage, KESS3 offers immediate ROI for tuners working on Vehicles , including Dodge, Jeep and RAM.
Become a VIEZU dealer to access tools, files and support.
Supported vehicle models
This method applies to most GPEC2A ECUs found in FCA vehicles from 2015–2021.
Need tools or tuning support?
VIEZU offers everything you need to start unlocking and tuning GPEC2A ECUs:
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