Description
2012 GMC Sierra 5.3L ECM / ECU – VIN Programmed | Updated
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:
Complete communication & CAN-bus verification
Sensor input/output and signal integrity checks
Injector & ignition pulse simulation
Power, ground, and load-circuit analysis
Flash memory integrity and checksum validation
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 with IMMO or PATS may require key programming after installation. This is normal.
For a 100% plug-and-play solution with no relearns, your original ECU must be sent in for cloning. We transfer all security data to the replacement unit.
👉Add the cloning service as a bundle at checkout — $200 CAD / $140 USD
A prepaid shipping label will be emailed to you.
If cloning is not selected, the ECU will be VIN programmed, and a key relearn will be required after installation.
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.