If you’re dealing with frustrating, hard-to-diagnose issues in your 2006 Buick Terraza, the Engine Control Module (ECM) is often the culprit. As a technician with over two decades of experience, I’ve seen firsthand how a failing ECM can cause a cascade of problems, from a simple check engine light to a vehicle that refuses to start. This isn’t just a replacement part; it’s a comprehensive solution designed to restore your vehicle’s core functionality and get you back on the road with confidence.
This module, part number 12590032, arrives at your door completely programmed to your vehicle’s specific VIN. We handle the complex part by flashing it with the latest, most stable software updates directly from GM. This means you can bypass the expensive trip to the dealership for programming. You get a reliable, plug-and-play fix that restores factory performance, fuel efficiency, and communication between all your vehicle’s critical systems. For a professional or a dedicated DIYer, this is the most efficient way to solve complex electronic issues correctly the first time.
Case Study: A Tricky Diagnosis
I remember a 2006 Terraza that came into the shop with a complaint of intermittent stalling at stoplights and a persistent P0606 (ECM/PCM Processor Fault) code that would clear but always return. The owner had already replaced the spark plugs and an O2 sensor with no luck. After verifying power and ground to the module were solid, we knew the internal processor was failing. Swapping in a pre-programmed 2006 Terraza Engine Module like this one solved the problem instantly. The van ran smoothly, the code never returned, and the customer was relieved to have a reliable vehicle again.
Is Your Terraza Showing These ECM Failure Signs?
A faulty ECM can manifest in various ways. If you’re experiencing any of the following, it’s a strong indicator that your engine’s computer needs attention.
- ✔ The Check Engine Light is on or flashes intermittently.
- ✔ Your vehicle has trouble starting or won’t start at all.
- ✔ Unexplained drops in fuel economy and poor engine performance.
- ✔ The engine stalls, stutters, or misfires for no apparent reason.
- ✔ Your automatic transmission shifts harshly or at the wrong times.
- ✔ You have active diagnostic trouble codes (DTCs) like P0601, P0606, or U0100.
- ✔ Loss of communication with the module when using a scan tool.
Your Step-by-Step ECM Installation Guide
Installing your new 2006 Terraza Engine Module is a straightforward process. Following these steps will ensure a smooth and successful replacement.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to allow the system to fully discharge.
- Locate the Module: On the 2006 Terraza, the ECM is found in the LH (driver’s side) engine compartment. It’s a silver box with large electrical connectors.
- Disconnect Connectors: Carefully release the locking tabs on the electrical harnesses and pull them straight out from the module. Avoid pulling on the wires themselves. Inspect the connectors for any corrosion or damage.
- Remove the Old ECM: Unbolt the module from its mounting bracket. There will be a few bolts holding it in place. Keep the hardware, as you may need it for the new unit.
- Install the New ECM: Mount the new module securely onto the bracket. Reconnect the electrical harnesses, making sure they click firmly into place and the locking tabs are engaged.
- Reconnect Battery: Reattach the negative battery terminal. The vehicle may require a security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes. Consult your owner’s manual for specific instructions.
Verified Compatibility Across GM Models
This ECM is a direct replacement for service number 12590032 and is also interchangeable with 12602044, 12603530, 12605843, 12607096, 12630457, and 19210737. It fits a wide range of vehicles beyond the 2006 Terraza Engine Module. Please verify your specific model and options below:
ALLURE 08-09 5.3L
ACADIA 07-08
COLORADO 08
ENVOY 07-09
ENCLAVE 08
G6 06-09
MONTE CARLO 06
XLR 06-09
AURA 08-09
DTS 06, 08
DEVILLE 05 (ID 12590032)
IMPALA 06, 08-09
LACROSSE 08-09 5.3L
STS 06, 08
TRAILBLAZER 07-09
UPLANDER 06, 08-09
ISUZU ASCENDER 08
SAAB 9-7X 07-08
LUCERNE 06, 08
CTS 06 (V-Series, ID 12603530)
ION 06 2.4L
MALIBU 06, 08-10
RELAY 06 3.9L
VUE 08-10
OUTLOOK 08
SOLSTICE 06
GRAND PRIX 08 5.3L
HHR 06 2.4L
ISUZU I-290 08
ISUZU I-370 08
MONTANA 06, 08-09
CANYON 08
COBALT 06 2.4L
SRX 08 4.6L
PURSUIT 06 2.4L
HUMMER H3 08
…and many more. Please use the fitment tool to confirm your exact application.
Frequently Asked Questions
How does the VIN programming work?
After you complete your purchase, you will need to provide us with your vehicle’s 17-digit VIN. Our technicians use this number to flash the module with the correct GM-certified software for your specific vehicle, including all factory options and the latest updates. This ensures perfect compatibility.
Is this part difficult to install for a DIYer?
No, this is a great project for a DIY enthusiast. Because the module comes pre-programmed, the installation is purely mechanical. It involves disconnecting the battery, unplugging the old module, swapping it with the new one, and reconnecting everything. No special computer tools are needed.
Will this fix my specific problem?
This module is a direct solution for a failed ECM. If your vehicle has been properly diagnosed with a faulty engine computer (e.g., with codes like P0601 or P0606), then this part will resolve those issues. It corrects problems like stalling, no-start conditions, and erratic engine behavior caused by the ECM.
What if I have the wrong part number?
This module replaces several part numbers, including 12590032, 12602044, 12603530, and more. As long as your vehicle is on our compatibility list, this module will work, even if the number on your old part is different. The VIN programming is what guarantees it functions correctly.