Restore Your Impala’s Performance and Reliability
Is your 2012 Chevrolet Impala running rough, stalling unexpectedly, or showing a persistent check engine light? These are classic signs of a failing Engine Control Module (ECM), the central computer that manages your vehicle’s engine performance, fuel economy, and emissions. When the ECM starts to fail, it can cause a host of frustrating and difficult-to-diagnose problems. This isn’t just an inconvenience; it’s a critical component failure that can leave you stranded.
As a technician with over two decades of experience, I’ve seen countless drivers spend a fortune at the dealership for this exact issue. The diagnosis is one part, but the real cost comes from the mandatory programming of a new module. We eliminate that step entirely. This module isn’t just a replacement part; it’s a complete solution. We professionally flash it with the latest GM-certified software specific to your car’s Vehicle Identification Number (VIN) before it ships. This means it arrives at your door ready for a straightforward installation, saving you time and hundreds of dollars in programming fees.
From the Diagnostic Bay
I remember a 2012 Impala that came into my shop with an intermittent no-start condition that no one could figure out. It would run fine for days, then refuse to crank. There were no consistent trouble codes, just a random U0100 ‘Lost Communication with ECM’ code that would pop up and disappear. After checking all the wiring and power feeds, we suspected the ECM itself was failing internally when it got hot. We swapped in one of our pre-programmed modules, and the problem was solved instantly. The customer avoided a costly diagnostic rabbit hole and an expensive trip to the dealer. This is the exact, reliable fix for those phantom electronic issues.
Is Your Impala Showing These Signs of ECM Failure?
A faulty ECM can manifest in various ways. If you’re experiencing any of the following, it’s a strong indicator that your vehicle’s computer needs attention. Don’t let these issues get worse.
- ✔ Check Engine Light is on with no clear cause.
- ✔ Engine stalling or shutting off while driving.
- ✔ No-start or hard-starting conditions.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Poor engine performance, hesitation, or misfiring.
- ✔ Transmission shifting erratically or harshly.
- ✔ Diagnostic Trouble Codes (DTCs) related to internal module failure (e.g., P0601, P0606) or communication errors (e.g., U0100).
A Straightforward Guide to Your ECM Installation
Replacing the ECM on your 2012 Impala is a manageable job for a DIY enthusiast. This pre-programmed module makes it even simpler. Follow these steps for a successful installation. Note: Some vehicles may require a security or CASE relearn procedure with a capable scan tool after installation, though many will start and run without it.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes for the system capacitors to discharge.
- Locate the ECM: On the 2012 Impala, the Engine Control Module is typically mounted on the air cleaner bracket in the engine bay.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old ECM. These connectors have locking tabs; be gentle to avoid breaking them.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the mounting hardware, as you will need it for the new module.
- Install the New Module: Mount your new, pre-programmed ECM onto the bracket using the original hardware. Ensure it is secure.
- Reconnect Everything: Plug the wiring harnesses firmly into the new ECM. You should hear or feel a click as they lock into place. Reconnect the negative battery terminal.
- Final Check: Turn the key to the ‘ON’ position (without starting the engine) for 10-15 seconds to allow the systems to initialize. Then, start the vehicle. Your Impala should now run smoothly with its new computer.
Verified Vehicle Compatibility List
This ECM is a direct-fit replacement for a wide range of GM vehicles. Please verify your vehicle and original part number from the list below. This module replaces part numbers: 12616889, 12630908, 12637106, 12642665, 12650256, 12651993.
CAMARO 12 (3.6L)
CAPTIVA SPORT 12
CTS 10-12 (3.0L, 3.6L)
EQUINOX 10-11
IMPALA 12
LACROSSE 10-11 (2.4L, 3.0L)
ORLANDO 12-13
REGAL 11
SAAB 9-5 10-11 (2.0L)
SRX 10-11 (3.0L)
TERRAIN 10-11
Note: This is not an exhaustive list. Please provide your VIN upon purchase to guarantee perfect programming and compatibility.
Frequently Asked Questions
Do I need to do any programming or flashing myself?
No. We handle all the programming for you before we ship the part. We use your VIN to load the correct, updated GM software, so it’s ready for installation right out of the box.
Where do I find my VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on a plate on the driver’s side dashboard visible through the windshield.
What if my original part number is not on your list?
The part numbers listed are the most common ones this ECM replaces. GM often consolidates part numbers. If you provide us with your VIN, we can verify compatibility even if your number isn’t shown.
Is this a difficult part to install for a DIYer?
For most people with basic hand tools, this is a very manageable job. The most important part is being careful with the electrical connectors. Our pre-programming service removes the most difficult part of the job—the software flashing.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the ECM (like codes P0601-P0606) or related communication faults, then yes, this module is the correct fix. However, a check engine light can have many causes, so proper diagnosis is always recommended.