Restore Your Engine’s Performance with a Reliable, Programmed ECM
Is your 2004-2006 Buick Rendezvous suffering from frustrating and unpredictable engine problems? Issues like stalling, a persistent Check Engine Light, or a complete no-start condition often point directly to a failing Engine Control Module (ECM). As the central computer for your engine, a faulty ECM can disrupt everything from fuel delivery to ignition timing, making your vehicle unreliable. This listing is for a dependable, used OEM Engine Control Module, part number 12592124, that has been meticulously tested and is ready to solve your vehicle’s issues.
The biggest challenge with replacing an ECM is the required programming. We eliminate that headache completely. Before we ship your part, we will flash it with the latest official GM software updates, perfectly matched to your vehicle’s specific Vehicle Identification Number (VIN). This means you receive a part that is ready for installation, saving you a costly trip to the dealership and significant diagnostic fees. This is the most direct and efficient way to get your Rendezvous back to factory-spec operation.
A Technician’s Notebook
I remember a 2005 Rendezvous that came into the shop with a very tricky intermittent stalling problem. It would only happen after driving for 20-30 minutes, once everything was heat-soaked. The owner had already replaced a couple of sensors with no luck. Standard scan tool data looked normal right up until the moment it died, with no specific trouble codes stored besides a generic loss of communication. After verifying power and grounds to the ECM were solid, we suspected an internal failure in the module itself, likely a hairline crack in a circuit board that expanded when hot. We swapped in a known-good programmed ECM, and the problem was solved instantly. It’s a classic scenario where the 2004-2006 Rendezvous ECM was the root cause.
Common Signs of a Failing ECM
If your vehicle is exhibiting any of these symptoms, a failing engine computer could be the culprit. A failing module can often store internal fault codes that point directly to the issue.
- ✔ Unexplained stalling or rough idling
- ✔ Vehicle refuses to start, even with a good battery and starter
- ✔ Check Engine Light is illuminated with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault)
- ✔ Poor fuel economy and noticeable loss of power
- ✔ Intermittent loss of communication with scan tools
- ✔ Harsh or erratic transmission shifting
Plug-and-Play Installation: Get Back on the Road Fast
Installing your programmed 2004-2006 Rendezvous ECM is a straightforward process that a confident DIYer or any professional mechanic can handle. While this module is pre-programmed, you may need to perform a simple security relearn procedure after installation so the vehicle recognizes the new module. This procedure can typically be done without special tools.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- Locate the ECM: On the Buick Rendezvous, the ECM is typically found in the engine compartment, on the driver’s side, often near or under the air cleaner housing.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old module. Inspect them for any corrosion or damage.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Bolt the replacement ECM into place and securely reconnect the wiring harnesses. Ensure they click into place.
- Reconnect Battery & Perform Relearn: Reconnect the negative battery terminal. The final step is to perform the vehicle’s security relearn procedure (often called a Passlock or Passkey relearn). This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Consult your owner’s manual or a reliable online resource for the specific steps for your model year.
Will This Fit My Vehicle?
This ECM is a direct fit for a variety of GM vehicles. Please verify your part number or consult the list below. This module, part number 12592124, is also a direct replacement for service numbers 12581144, 12588472, and 19260507.
- 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)
Don’t let a faulty computer keep you off the road. Order this quality-tested and programmed 2004-2006 Rendezvous ECM today and restore your vehicle’s reliability and performance.
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, simply send us a message with your vehicle’s 17-digit VIN. We cannot ship the module until we receive this information, as the programming is essential for it to function in your vehicle.
Is this part new?
No, this is a high-quality, tested, and fully functional used part sourced from a salvaged vehicle. This provides a reliable and cost-effective solution compared to a new dealer part.
Do I need to do anything after installing the ECM?
Yes. While the main engine programming is done for you, you will likely need to perform a security relearn procedure. This syncs the module to your vehicle’s anti-theft system and is required for the engine to start. This procedure is simple and typically does not require special tools.
What if my original part number is different?
This ECM, 12592124, also replaces service numbers 12581144, 12588472, and 19260507. If your module has one of these numbers, this part is compatible. Please check the fitment list to confirm your make and model.
Will this fix my Check Engine Light?
If the Check Engine Light is on due to an internal ECM failure (like codes P0601-P0606), then this part is the correct fix. However, a Check Engine Light can be caused by hundreds of other issues. Proper diagnosis is key to ensuring you are replacing the correct part.