Description
2014 GMC Sierra 4.3L ECM / ECU – VIN Programmed | Updated
This Engine Control Module (ECM / ECU) is a genuine OEM replacement for all 2014 GMC Sierra 4.3L models.
Each unit is VIN-programmed, updated, and fully tested.Built to OEM standards for reliability, calibration accuracy, and long-term performance.
Strict Testing & Quality Assurance
This is not a brand-new unit. It is a rebuilt unit that is inspected, refreshed, and fully tested before shipping.
Testing includes communication, CAN-bus, sensor signal, power circuit, flash memory, and reliability checks.
Important Note
If your vehicle does not have an IMMO or PATS system, this unit will be directly plug&play.
If your vehicle has an IMMO or PATS system, it will require a key relearn after installation. You can visit your local locksmith for help.
We also offer a full cloning service. We transfer all security data to the replacement unit, so it will be a plug&play installation.
For all European cars, Hyundai, and Kia vehicles, we recommend adding our cloning service as a bundle.
For American and Japanese cars, we recommend doing a key relearn on-site.
Contact Us
Email: info@fixecm.com
Phone: Local: 647-247-8555 | Toll-Free: 1-800-915-5566
Sean Poole –
I was a bit nervous ordering a replacement ECM for my 2014 GMC Sierra, but this unit arrived already VIN programmed and ready to go, which saved me a ton of time. The plug-and-play setup made the installation straightforward, even for someone like me who isn’t a professional mechanic. Shipping was surprisingly quick and affordable, so I didn’t have to wait long to get my truck back on the road. The engine runs smoothly now, and I haven’t encountered any issues since the swap. Overall, a fantastic experience from start to finish.
Brandon Anderson –
Fast shipping and the plug-and-play ECM fit perfectly in my 2014 Sierra; saved me a ton compared to dealer prices. Installation was straightforward, and the team’s communication made the whole process smooth.
Jonah Morris –
I purchased the 12704477 ECM for my 2014 GMC Sierra, and I couldn’t be happier with the experience. The shipping was impressively fast, and the unit was truly plug-and-play—installation went smoothly without any hiccups. The staff’s professional support made the whole process simple, and I ended up saving a ton compared to dealer prices. This was definitely the smart choice for getting my truck back on the road quickly.
Trevor Keller –
I was really impressed with how quickly this ECM arrived—shipping was surprisingly fast. When it came time to install, the unit was truly plug-and-play, which made the whole process hassle-free. The vehicle started right up without any issues, and it saved me a significant amount compared to taking it to a dealer. The communication from the seller was clear and helpful, keeping me informed every step of the way. Overall, this purchase was a great experience and I would definitely recommend it to anyone needing a reliable replacement ECM.
Cole Hayes –
I was really impressed with how smooth the whole process was from start to finish. The 2014 GMC Sierra ECM came fully VIN programmed and ready to plug right in, which saved me a ton of hassle. Shipping was very reasonable and arrived quicker than I expected. Whenever I had questions about the setup, their support team responded promptly and clearly, making me feel confident about the purchase. Since installing it, my truck runs flawlessly, and I couldn’t be happier with the quality and service. Definitely a reliable source if you need a replacement ECM.
Russell Campbell –
I purchased the 12704477 ECM for my 2014 GMC Sierra and was really impressed by how smoothly everything went. The unit arrived quickly with free shipping, which was a nice bonus. What stood out most was the professional VIN programming service they provided, making the install completely plug-and-play. Communication was clear throughout the process, and they promptly answered all my questions, making me feel confident in my purchase.
Adam Page –
The VIN programmed ECM arrived fast and was plug-and-play, making the installation hassle-free. Shipping was quick and affordable too.