Restore Peak Performance to Your 2010 Hummer H3 5.3L
Is your Hummer H3 experiencing frustrating issues like a persistent check engine light, rough idling, stalling, or a complete no-start condition? These are classic signs that the brain of your engine, the Engine Control Module (ECM), may be failing. The ECM is the central command unit for your vehicle’s engine, managing everything from fuel injection and ignition timing to emissions control and transmission shifting. When it falters, the entire vehicle’s performance and reliability are compromised. This replacement Engine Control Module, part number 12678513, is the definitive solution to restore your vehicle’s factory performance and dependability.
From the Diagnostic Bay
We had a 2010 Hummer H3 5.3L come into the shop that was driving the owner crazy. It would randomly stall at stoplights and had an intermittent check engine light for various sensor circuits. The owner had already replaced the throttle body and a couple of sensors with no luck. After hooking up our diagnostic scanner and monitoring live data, we noticed the 5-volt reference signal was dropping out sporadically. Instead of immediately condemning the computer, we did our due diligence and checked the main power and ground connections to the ECM. They were solid. This confirmed our suspicion: the ECM itself had an internal fault. After installing one of our VIN-programmed modules, the 5-volt reference was stable, all codes were gone, and the stalling issue was completely resolved. It’s a reminder that while other parts can cause similar symptoms, a faulty ECM is often the root cause of the most elusive electrical gremlins.
Is Your 2010 Hummer H3 ECM Failing?
A failing engine computer can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following, it’s a strong indication that your ECM needs attention:
- ✔ Persistent Check Engine Light (CEL) that won’t clear or returns immediately.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ A noticeable decrease in fuel economy.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Multiple unrelated trouble codes stored in memory.
The Plug-and-Play Solution: Programmed to Your VIN
Replacing an ECM isn’t as simple as swapping out a battery. Modern vehicle computers are coded specifically to the Vehicle Identification Number (VIN) of the car they belong to. This ensures all systems, including anti-theft and emissions controls, function correctly. Our service eliminates the need for an expensive trip to the dealership for programming. Simply provide us with your vehicle’s VIN during checkout, and our technicians will flash this module with the latest GM-certified software for your exact 2010 Hummer H3. This ensures a seamless installation process, getting you back on the road quickly and without the hassle of additional programming fees.
Broad GM Compatibility
While this is a perfect fit for the 2010 Hummer H3 ECM, this versatile module (service numbers 12678513, 12633264) is also the correct replacement part for a wide range of other GM vehicles. Please verify your part number and check the compatibility list below to ensure a perfect match for your car or truck.
- CANYON / COLORADO (2010-2012): 5.3L
- CAMARO (2012): 3.6L or 6.2L (with ID 12633264)
- CAMARO (2013-2015): 6.2L (VIN P, opt LSA)
- CORVETTE (2010-2013): 6.2L (VIN R or T, opt LS9)
- CTS (2010-2013): 6.2L
- CTS (2014): Coupe, Sedan, or Wagon with 6.2L
- CTS (2015): Coupe
- MALIBU (2010-2012): 3.6L
Frequently Asked Questions
Do I need to do any programming after I receive this ECM?
No. We program the module to the VIN you provide before shipping. In most cases, it is a direct installation. However, some vehicles may require a simple security relearn procedure, which can be done without special tools and instructions can be provided.
How do I provide my vehicle’s VIN?
You can add your 17-digit VIN in the notes section during checkout or send it to us in a message after your purchase. We cannot ship the part until we have your VIN.
Is this a new part?
This is a high-quality, tested, and inspected original equipment part that has been professionally serviced and programmed with the latest vehicle software. It is guaranteed to meet or exceed original factory specifications.
What if I have other issues with my vehicle?
This ECM will only fix problems directly caused by a faulty engine computer. It is crucial to properly diagnose your vehicle before purchasing. This part will not solve issues related to bad sensors, wiring, or other mechanical failures.
Where is the ECM located on a 2010 Hummer H3?
On the 2010 Hummer H3, the Electronic Control Module (ECM) is typically located on the right-hand (passenger side) of the firewall in the engine bay.