Description
2012 GMC Sierra 5.3L ECM / ECU – VIN Programmed | Plug & Play
This Engine Control Module (ECM / ECU) is a genuine OEM replacement for all 2012 GMC Sierra 5.3L models.
Each unit is VIN-programmed, updated, and fully tested for a true plug-and-play installation with no dealer visit required.
Built to OEM standards for reliability, calibration accuracy, and long-term performance.
Strict Testing & Quality Assurance
Every ECU is inspected, refreshed, and verified through advanced diagnostic tools. Testing includes:
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Complete communication & CAN-bus verification
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Sensor input/output and signal integrity checks
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Injector & ignition pulse simulation
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Power, ground, and load-circuit analysis
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Flash memory integrity and checksum validation
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Thermal and voltage-stress testing to confirm reliability
This ensures a fully functional, reliable, plug-and-play module you can install with confidence.
Important Note
Some vehicles equipped with IMMO (Immobilizer) or PATS (Passive Anti-Theft System) may require additional key programming after installation. This is normal for models where security data must be synchronized with the vehicle’s body control system.
For a 100% plug-and-play solution with no relearns, no key programming, and no compatibility issues, we recommend our ECU Cloning Service, which transfers all original security, immobilizer, and configuration data directly into the replacement unit.
Contact Us
Email: info@fixecm.com
Phone: Local: 647-247-8555 | Toll-Free: 1-800-915-5566
Chris Sanders –
The 2012 GMC Sierra ECM arrived quickly and was exactly as described. Installation was straightforward, with no complicated programming needed since it came pre-programmed for my VIN. The engine started right up, and everything runs smoothly now. I appreciate the quality and hassle-free setup—definitely recommend this for anyone needing a replacement ECU.
Miguel Kelly –
Got exactly what I needed for my 2012 Sierra, and it was ready to go right out of the box—super smooth install! Shipping was quick too, highly recommend.
Henry Mitchell –
I was a bit nervous ordering an ECM online, but this 2012 GMC Sierra 5.3L unit arrived super fast and was exactly as described. I plugged it in following the instructions, and it fired right up with no issues—no reprogramming needed, which saved me a lot of hassle. The truck runs smoother now, and I’ve had zero codes pop up since the swap. Customer support was really helpful when I had a question about the VIN programming, making the whole process stress-free. Definitely a solid buy if you want a quick and reliable fix for your Sierra.