Is Your Buick Rendezvous Running Out of Ideas?
If your 2004-2006 Rendezvous is suddenly stalling, hesitating, shifting erratically, or throwing a stubborn Check Engine Light that won’t go away, the problem often points directly to the heart of its electronic system: the Engine Control Module (ECM). As a technician with over two decades of experience under the hood, I’ve seen countless owners replace perfectly good sensors and parts, only to find the root cause was a failing ECM all along. The complex circuits inside these modules can degrade over time from heat and vibration, leading to frustrating and unpredictable performance issues.
A customer’s 2005 Rendezvous came into my shop last week with these exact symptoms. It had a random cylinder misfire code that would jump around, and the fuel economy had plummeted. After confirming the wiring harness and injectors were solid, we pinpointed the fault to the ECM’s internal driver circuits. Swapping the module was the only path forward, and this is the exact, reliable solution we used.
The Smart Solution: A Pre-Programmed 2004-2006 Rendezvous ECM
Forget expensive dealership visits and the hassle of towing your vehicle for programming. This is a genuine, road-tested used GM Engine Control Module that we program specifically for your vehicle before it ever leaves our facility. Simply provide us with your Vehicle Identification Number (VIN) during checkout, and we’ll flash the module with the latest, most stable software updates from General Motors. This ensures perfect communication with your Rendezvous’s other systems, like the transmission controller and anti-lock brakes, right out of the box.
Expert Pro Tip: Check Your Grounds Before Installation
Before you install your replacement ECM, take 10 minutes to locate and clean the main engine-to-chassis ground strap. It’s often a braided metal strap bolted to the engine block and the vehicle’s frame. Over the years, these can corrode, causing high resistance. A bad ground can starve the ECM of stable voltage, leading to bizarre electrical issues that mimic ECM failure and can even damage the new module. A quick cleaning with a wire brush can save you a massive headache.
Simple, Straightforward Installation
We make this repair as easy as possible. You don’t need specialized diagnostic tools to get your Rendezvous running right again. In most cases, a basic security relearn procedure is all that’s needed after installation.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the ECM: On the 2004-2006 Rendezvous, the ECM is found in the engine compartment on the driver’s side (LH), often near or under the air filter housing.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Then, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt your pre-programmed ECM into place and securely reconnect the electrical harnesses. Ensure they click into place.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn: Turn the key to the ‘ON’ position (without starting the engine) for 10-15 minutes. Turn it ‘OFF’ for 10 seconds, then repeat two more times. This allows the vehicle’s anti-theft system to recognize the new ECM. Your vehicle should now start and run correctly.
This Module Will Resolve Common Symptoms Including:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Engine stalling or shutting off while driving
- ✔ No-start or hard-starting conditions
- ✔ Poor engine performance and reduced power
- ✔ Decreased fuel economy
- ✔ Communication error codes with a scan tool
Guaranteed Compatibility and Fitment
This module is a direct replacement for service part numbers 19260507, 12581144, 12588472, and 12592124. It is guaranteed to fit and function correctly in the following vehicles:
- Buick Rendezvous: 2004-2005 (with ID 19260507), 2006 (3.6L)
- Buick Allure / LaCrosse: 2005-2008 (3.6L)
- Cadillac CTS: 2004-2007 (Base, with ID 19260507 or 12592124)
- Cadillac SRX: 2004-2006 (3.6L)
Don’t let a faulty computer keep your reliable Buick off the road. Order today, provide your VIN, and get the plug-and-play solution delivered to your door.