Restore Peak Performance to Your GM Vehicle
Is your 2010-2011 Chevrolet Equinox or GMC Terrain acting up? Stalling unexpectedly, showing a persistent Check Engine Light, or suffering from poor fuel economy? These are classic signs of a failing Engine Control Module (ECM), the central computer of your vehicle. A faulty ECM can create a cascade of frustrating and difficult-to-diagnose issues. This isn’t just an inconvenience; it’s a critical component failure that affects your vehicle’s reliability and safety.
As a technician with over two decades of experience, I’ve seen firsthand how a failing ECM can mimic dozens of other problems. I’ve spent countless hours tracing wires and testing sensors, only to find the root cause was the module itself. This replacement Engine Control Module, part number 12642665, is the definitive solution. We take the guesswork and hassle out of the repair by programming the unit specifically to your vehicle’s VIN before it ships. This ensures it arrives with the latest GM software updates, ready for a straightforward installation.
From the Diagnostic Bay: The Intermittent Stall Case
A customer brought in a 2011 Equinox with a problem that had stumped two other shops: it would randomly stall at stoplights, but only when the engine was hot. There were no consistent trouble codes, just a vague U0100 (Lost Communication with ECM) stored in the BCM. After confirming fuel pressure and spark were good during normal operation, I focused on the 2010-2011 Equinox ECM itself. By monitoring live data, I noticed the 5-volt reference signal to the throttle body would momentarily drop just before a stall. This pointed to an internal ECM fault triggered by heat soak. Replacing the ECM with a pre-programmed unit like this one solved the problem instantly. It’s a textbook example of how a failing module can cause ghost-like issues.
Is Your Vehicle Showing These Symptoms?
A failing ECM can manifest in many ways. If you’re experiencing any of the following, this module is likely the solution you need:
- ✔ Check Engine Light is on with codes like P0601, P0606, or other internal processor faults.
- ✔ Engine cranks but refuses to start.
- ✔ Unexplained drops in fuel efficiency.
- ✔ Rough or erratic idling and stalling.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Communication errors with scan tools or other modules (U-codes).
- ✔ Apparent failure of multiple sensors at once.
A Straightforward Guide to Installation
Installing your new 2010-2011 Equinox ECM is a manageable job for a DIYer with basic tools. Follow these steps carefully for a successful replacement.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes to allow all system capacitors to discharge.
- Locate the ECM: On the Equinox and Terrain, the ECM is typically found in the left-hand (driver’s side) of the engine compartment, often near the fuse box or air filter housing.
- Disconnect the Harnesses: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Never force them. Inspect the connectors for any corrosion or bent pins.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the hardware, as you may need to reuse it.
- Install the New Module: Mount your new, pre-programmed ECM securely onto the bracket.
- Reconnect Everything: Plug the electrical harnesses back into the new ECM until they click firmly into place. Reconnect the negative battery terminal.
- Perform Security Relearn: While the module is programmed, your vehicle’s anti-theft system may need to be relearned. This simple procedure usually involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating two more times before starting the engine. Consult your owner’s manual for the specific procedure.
Verified Vehicle Compatibility
This ECM is a direct-fit replacement for a wide range of GM vehicles and interchanges with several part numbers. Please verify your vehicle is on this list. This unit replaces part numbers: 12616889, 12630908, 12637106, 12642665, 12650256, and 12651993.
- ALLURE 2010 (2.4L, 3.0L)
- CAMARO 2012 (3.6L)
- CAPTIVA SPORT 2012
- CTS 2010-2012 (3.0L, 3.6L)
- EQUINOX 2010-2011
- IMPALA 2012
- LACROSSE 2010-2011 (2.4L, 3.0L)
- ORLANDO 2012-2013
- REGAL 2011
- SAAB 9-5 2010-2011 (2.0L)
- SRX 2010-2011 (3.0L)
- TERRAIN 2010-2011
Frequently Asked Questions
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming before shipping. You just need to provide your vehicle’s 17-digit VIN at checkout. The module arrives ready for installation.
What is a security relearn procedure?
It’s a simple process that syncs the new ECM with your vehicle’s anti-theft system. It typically takes about 30 minutes and only requires your car key. We include general instructions, but the exact steps can be found in your owner’s manual.
Where do I find my VIN?
Your VIN can be found on your vehicle’s registration, insurance card, or on a metal plate on the driver’s side of the dashboard, visible through the windshield.
Is this a guaranteed fix for my vehicle’s problems?
This module will correct any issues directly caused by a faulty ECM. However, it’s crucial to ensure your vehicle has been properly diagnosed. This part will not fix problems with other components like bad sensors or wiring issues.
Do I need to send my old ECM back (core charge)?
This listing does not require a core return. You can keep or responsibly dispose of your old module.
How quickly will you ship the module?
Once we receive your order and your VIN, programming is typically completed within one business day, getting your part on its way to you as quickly as possible.