Is Your GM Vehicle Running Rough or Not Starting?
A failing Engine Control Module (ECM) can be the source of countless frustrating and difficult-to-diagnose issues. As the central computer for your engine, the ECM is responsible for managing everything from fuel injection and ignition timing to emissions controls and transmission shifting. When it begins to fail, you might experience a check engine light that won’t go away, poor fuel economy, stalling, or even a complete no-start condition. This can leave you stranded and facing a costly diagnostic bill at the dealership. Don’t let a faulty computer keep your car off the road.
The Plug-and-Play Solution for Your Vehicle
This is a genuine, road-tested OEM Engine Control Module, part number 12633555 (interchangeable with 12653998, 12655007, and 12644446), that provides a reliable and straightforward fix. The single greatest advantage we offer is our professional programming service. Before this module ships, we flash it with the latest, most stable software updates directly from GM, specifically matched to your vehicle’s unique Vehicle Identification Number (VIN). This means no expensive trips to the dealer for programming, no special tools required, and no complex procedures. It’s designed to be a direct-fit, plug-and-play replacement to get you back on the road quickly and affordably.
From the Diagnostic Bay
We once had a 2014 Chevy Equinox come in with an intermittent stalling problem and a P0606 (ECM Processor Fault) code. The owner had already replaced the crankshaft position sensor and the throttle body based on advice from a forum, but the problem persisted. After confirming power and ground to the module were good, we diagnosed a failing internal processor in the ECM. Instead of a multi-day wait and a $1200 bill from the dealer, we sourced a quality used unit like this one, programmed it to the customer’s VIN, and had them back on the road the same afternoon for a fraction of the cost. It’s a perfect example of how the right part, correctly programmed, can save you time, money, and a lot of headaches.
Identifying a Failing 2013-2016 LaCrosse ECM
The symptoms of a bad ECM can often mimic other component failures, making diagnosis tricky. However, if your vehicle is experiencing several of the following issues, the ECM is a likely culprit. This module is the correct solution for a wide range of GM vehicles that exhibit these problems.
Common Symptoms of ECM Failure:
- ✔ Persistent Check Engine Light: The light stays on even after clearing codes, or codes related to module communication or processor faults (e.g., P0601, P0606) are present.
- ✔ Engine Stalling or Misfiring: The engine may stall unexpectedly, run rough, or misfire without a clear cause from spark plugs or coils.
- ✔ No-Start Condition: The engine cranks but refuses to start, often due to the ECM not commanding fuel or spark.
- ✔ Poor Fuel Economy: A sudden and unexplained drop in MPG can be caused by the ECM failing to properly regulate the air-fuel mixture.
- ✔ Communication Errors: Your mechanic’s scan tool is unable to communicate with the engine control module.
- ✔ Erratic Transmission Behavior: The ECM plays a key role in communicating with the transmission control module, and a fault can cause harsh or incorrect shifting.
Guaranteed Compatibility and Simple Process
This ECM is a direct fit for a vast array of GM models. Simply confirm your vehicle is on the list below. Our process is designed for your convenience:
- Place Your Order: Add this item to your cart and complete the checkout process.
- Provide Your VIN: After your purchase, reply to your order confirmation email with your 17-digit VIN. This is critical for correct programming.
- We Program & Ship: Our technicians will program the module with your vehicle’s specific software. The part then ships directly to you, ready for installation.
- Install & Drive: In most cases, you can simply install the module and start the vehicle. Some models may require a simple, 10-15 minute security relearn procedure that you can do yourself with just the key—no special tools needed.
This module fits the following vehicles:
Buick (Enclave, LaCrosse, Regal, Verano), Cadillac (ATS, CTS, SRX, XTS), Chevrolet (Camaro, Captiva Sport, Caprice, Equinox, Impala, Malibu, Orlando, Traverse), GMC (Acadia, Terrain). Please check the detailed fitment data in the product specifications to ensure it matches your specific engine and options.
Frequently Asked Questions
Do I need to get this ECM programmed by a dealer?
No. The main benefit of our service is that we program the module for you before it ships. All you need to do is provide us with your vehicle’s VIN after purchase. This saves you the time, hassle, and expense of a dealership visit.
Is this a new part?
No, this is a high-quality, tested, and fully functional used OEM part sourced from a salvaged vehicle. Every module is inspected to ensure it meets our strict quality standards before being programmed and shipped.
Where can I find my VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, your insurance card, or on the driver’s side of the dashboard, visible through the windshield.
What if my original part number is slightly different?
This listing is for ECM 12633555 and is also a direct replacement for part numbers 12653998, 12655007, and 12644446. As long as your vehicle is listed in the compatibility chart, this module will function correctly once programmed to your VIN.
Will this part require any additional procedures after installation?
In most cases, it is a simple plug-and-play installation. However, some GM vehicles may require a security relearn procedure (also known as a key relearn) to sync the new ECM with your vehicle’s anti-theft system. This is a simple process that typically takes 10-15 minutes and can be done without any special tools.