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
Marcus James –
I purchased the 12656252 ECM for my 2014 GMC Sierra 4.3L and was really impressed with the entire process. The unit arrived quickly with free shipping, which was a pleasant surprise. What stood out was the professional VIN programming service—they had it ready to go when it arrived, so installation was straightforward. Their team also kept me informed throughout, answering my questions promptly, which made the whole experience smooth and hassle-free.
John Bailey –
The VIN programmed ECM arrived quickly with free shipping and installed perfectly—saved me a ton of hassle.
Excellent communication throughout the process and the plug-and-play setup made replacing my 2014 Sierra’s ECU super easy.
Fast turnaround and the quality of the PCM is top-notch; they answered all my questions promptly which gave me confidence.
Very impressed with the professional programming service, everything worked flawlessly right out of the box.
Shipping was affordable and the unit showed up ready to go, making the entire repair process smooth and stress free.
Cameron James –
I was really impressed with how smooth the whole process went. The 2014 GMC Sierra ECM came VIN programmed, so installation was basically plug-and-play, which saved me a ton of time and hassle. Shipping was super reasonable, and the unit arrived faster than I expected. Whenever I had a question, their team responded quickly and clearly, which made me feel confident about the purchase. The truck has been running flawlessly since, and I can tell it’s a quality rebuild. I would definitely buy from them again.
Jordan Marshall –
Fast shipping and the unit was completely plug-and-play, saving me a ton compared to dealer prices. Installation was seamless and the communication was spot on.