Restore Peak Performance to Your GM Vehicle
Is your Cadillac, Buick, or Chevy suffering from frustrating and unpredictable issues like a persistent check engine light, stalling, poor fuel economy, or a complete no-start condition? A failing Engine Control Module (ECM) is often the culprit. As the central computer for your engine, its proper function is critical. This replacement ECM, part number 12617230, is the reliable, straightforward solution you need to get your vehicle back on the road with confidence.
We take the guesswork and high cost out of the repair process. Unlike a generic module from a parts store, this unit arrives at your door pre-programmed with the latest GM software updates, specifically matched to your vehicle using your VIN. This means no expensive trip to the dealership for programming. For most compatible vehicles, it’s a true plug-and-play fix that restores factory settings and engine performance.
From the Diagnostic Bay: The Ghost in the Machine
I remember a 2011 GMC Acadia that came into my shop with a complaint that stumped two other mechanics. The owner described intermittent stalling at stoplights and a random no-start condition that would vanish as mysteriously as it appeared. There were no consistent trouble codes, just a history of lost communication (U0100) with various modules. After confirming the battery and main grounds were solid, I focused on the ECM. On these 3.6L platforms, the ECM can develop internal faults that don’t always throw a hard code like a P0601 (Internal Memory Checksum Error). By monitoring live data, I saw erratic sensor readings just before a stall. Swapping in a known-good, programmed ECM like this one resolved all the issues immediately. It’s a classic case where the ECM becomes the ‘ghost in the machine,’ and a reliable replacement is the only true fix.
Is Your Vehicle Showing These ECM Failure Signs?
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Engine stalling, stumbling, or running rough for no apparent reason.
- ✔ A complete no-start condition where the engine cranks but won’t fire up.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Failure to pass state emissions testing.
- ✔ Diagnostic trouble codes (DTCs) related to internal processor failure (e.g., P0601, P0606).
- ✔ Communication error codes like U0100, indicating the ECM isn’t talking to other modules.
A Straightforward Guide to Installation
Replacing your 2010-2011 STS ECM is a manageable task for a DIYer with basic tools. Follow these steps carefully for a smooth installation.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes to allow all modules to power down completely.
- Locate the ECM: On the 2010-2011 Cadillac STS, the ECM is typically located in the engine compartment on the right-hand (passenger) side. For other models, it may be behind the fan shroud or on the left side. Consult your owner’s manual for the exact location.
- Disconnect Connectors: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Do not force them. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the hardware, as you will need it to install the new module.
- Install the New Module: Mount your new, pre-programmed ECM onto the bracket and secure it with the original hardware.
- Reconnect Everything: Plug the electrical connectors firmly back into the new ECM until they click into place. Reconnect the negative battery terminal.
- Final Steps: Your vehicle is now ready to start. In some cases, a security or crank relearn procedure may be required, which can often be completed without special tools. Instructions will be provided if necessary.
IMPORTANT NOTE FOR CAMARO & LACROSSE OWNERS: Due to the specific immobilizer systems in the 2010-2011 Camaro and LaCrosse, making this module fully plug-and-play requires us to transfer data from your original ECM. After your purchase, we will contact you with instructions for sending your old module to us. This essential step ensures your vehicle will start and run correctly without any additional programming.
Will This Fit My Vehicle?
This ECM is a direct replacement for part numbers 12617230, 19300015, 19300014, 12636355, and 12635019 and is guaranteed to fit the following models equipped with the 3.6L engine:
- 2010-2011 Cadillac STS
- 2010-2011 Cadillac CTS
- 2010-2011 Buick LaCrosse
- 2010 Buick Allure
- 2010-2011 Chevrolet Camaro
- 2010-2011 Chevrolet Traverse
- 2010-2011 GMC Acadia
- 2010-2011 Buick Enclave
- 2010 Saturn Outlook
Frequently Asked Questions
What does ‘VIN Programmed’ mean?
It means we load your vehicle’s specific Vehicle Identification Number (VIN) and the latest GM-approved software onto the module before shipping. This ensures the ECM works correctly with your engine, transmission, and options, eliminating the need for dealer programming.
Do I need to do anything else after I install it?
For most vehicles, it is a direct installation. However, some vehicles may require a simple throttle body or crankshaft position sensor relearn procedure, which can typically be done without special tools. We will provide instructions if applicable to your vehicle.
Why do you need my old module for a Camaro or LaCrosse?
These models have a more complex anti-theft (immobilizer) system. To ensure the new ECM communicates with your keys and allows the car to start, we must read the security data from your old module and write it to the new one. This makes the process completely plug-and-play for you.
How can I be sure this is the right part for my car?
The best way is to match the part number from your original ECM to one of the compatible numbers listed: 12617230, 19300015, 19300014, 12636355, or 12635019. If you are unsure, provide us with your VIN, and we can verify compatibility for you.
Is this a brand new part?
This is a high-quality, tested replacement part that has been verified to meet or exceed original equipment performance. It is loaded with new, vehicle-specific software from GM to ensure reliability.