Is Your Buick Rendezvous Running Rough? The ECM Might Be the Culprit.
If your 2004, 2005, or 2006 Buick Rendezvous is experiencing frustrating issues like a persistent Check Engine Light, poor fuel economy, stalling, or even a no-start condition, the problem may lie with a faulty Engine Control Module (ECM). The ECM is the brain of your vehicle’s engine, responsible for managing everything from fuel injection and ignition timing to emissions control. When it fails, it can cause a cascade of performance problems that can be difficult to diagnose and leave you stranded. Don’t let a bad computer keep your reliable Buick off the road.
This listing is for a genuine, used OEM Engine Control Module, part number 12592124. It is a direct, reliable replacement for your original unit, solving the communication errors and erratic behavior caused by a failing module. The best part? We take the guesswork and expensive dealership visits out of the equation. Simply provide us with your vehicle’s VIN during checkout, and our technicians will program the module with the latest GM software updates specific to your Rendezvous. It arrives at your door ready for installation, saving you time, money, and hassle.
From the Diagnostic Bay
We had a 2005 Buick Rendezvous with the 3.6L V6 come into the shop with a complaint of intermittent stalling and a check engine light that multiple other shops couldn’t solve. The owner had already replaced the throttle body, mass air flow sensor, and a couple of O2 sensors based on the codes. The codes would clear, but always return. When we hooked up our professional scan tool, we noticed something odd: the live data stream from the sensors would occasionally drop out or show erratic readings for a split second, just before a stall. This wasn’t a sensor issue; it was a processing issue. The ECM was failing internally. We installed one of these VIN-programmed modules, performed a quick security relearn, and the vehicle ran perfectly. The customer was thrilled to finally have a definitive fix after chasing ghosts for months. It’s a classic case of symptoms pointing to one thing, while the root cause is the computer itself.
Common Symptoms of a Failing GM ECM
- ✔ Persistent Check Engine Light (CEL) with various, often unrelated, trouble codes.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Misfire codes that don’t resolve after replacing plugs, coils, or injectors.
The Smart Solution: A Pre-Programmed 2004-2006 Rendezvous ECM
Replacing the ECM on these GM vehicles isn’t as simple as just swapping the part. A new or used module must be programmed to your vehicle’s specific Vehicle Identification Number (VIN) and equipped options to function correctly. Our professional programming service handles this critical step for you. We flash the module with the correct GM-certified calibration file, ensuring that it communicates perfectly with the other modules in your vehicle, like the Body Control Module (BCM) and Transmission Control Module (TCM). This plug-and-play approach makes the repair accessible for both seasoned mechanics and skilled DIYers.
This module is a direct replacement for several service numbers, including 12581144, 12588472, 12592124, and 19260507. Please verify that one of these numbers matches the part you are replacing to ensure compatibility.
Installation Note
While this module comes programmed to your VIN, some vehicles may require a simple “Security Relearn” procedure after installation to sync the module with your vehicle’s anti-theft system. This can typically be done without special tools and involves a sequence of key turns. Instructions are widely available online for your specific model. In some cases, a Crankshaft Variation Relearn (CASE Relearn) may be needed, which requires a capable scan tool.
Guaranteed Fitment For The Following Vehicles:
- ✔ Buick Allure: 2005-2008 (3.6L)
- ✔ Buick LaCrosse: 2005-2008 (3.6L)
- ✔ Buick Rendezvous: 2004-2006 (3.6L)
- ✔ Cadillac CTS: 2004-2007 (Base)
- ✔ Cadillac SRX: 2004-2006 (3.6L)
Frequently Asked Questions
Do I need to get this ECM programmed by a dealer?
No. We handle the programming for you before we ship the part. Just provide your vehicle’s 17-digit VIN when you place your order, and it will arrive ready for installation.
Is this a new part?
This is a high-quality, tested, and fully functional used OEM part sourced from a salvaged vehicle. This ensures OEM-level reliability and a perfect fit without the high cost of a new module from the dealership.
How do I find my VIN?
Your VIN can be found on your vehicle’s registration, insurance card, or on the driver’s side of the dashboard visible through the windshield. It is also located on the sticker in the driver’s side door jamb.
Will this part fix my vehicle’s problem for sure?
This part will correct your issue if the ECM has been correctly diagnosed as the point of failure. We recommend a thorough diagnosis by a qualified mechanic to confirm the ECM is faulty before ordering.
What is a security relearn procedure?
It is a simple procedure that syncs the new ECM to your vehicle’s anti-theft system and keys. For most GM vehicles of this era, it involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating this cycle three times. This allows the modules to recognize each other.