Restore Peak Performance to Your Minivan
Is your 2006 Buick Terraza suffering from baffling issues like intermittent stalling, a persistent Check Engine Light, or poor fuel economy? These aren’t just annoyances; they’re often signs that the brain of your engine—the Engine Control Module (ECM)—is failing. As a technician with over two decades of experience, I’ve seen firsthand how a faulty ECM can cause a cascade of problems that are often misdiagnosed, leading to expensive and unnecessary repairs. This isn’t just a replacement part; it’s a direct solution to restore your vehicle’s reliability and drivability.
This replacement 2006 Terraza Engine Module arrives at your door fully programmed with the latest GM software updates, specifically matched to your vehicle’s VIN. This critical step eliminates the need for a costly trip to the dealership for programming. You get a component that is ready for installation right out of the box, ensuring all your minivan’s systems communicate flawlessly, just as the factory intended.
From the Diagnostic Bay: The Minivan That Wouldn’t Cooperate
A customer brought in a 2006 Chevy Uplander (a sibling to the Terraza) with a complaint that stumped two other shops. The van would randomly lose power, the transmission would shift hard, and the dash would light up like a Christmas tree—but the codes were all over the place, mostly communication errors (U-codes). We checked grounds, wiring harnesses, and other modules. Everything seemed fine. On a hunch, I monitored the ECM’s live data stream. I noticed the 5-volt reference signal would occasionally drop out for a split second, just long enough to cause chaos but not long enough to set a consistent, hard fault. This pointed directly to an internal failure in the ECM. After installing a VIN-programmed module like this one, all the phantom issues vanished. It’s a classic case where the central computer was the true culprit.
Is Your Minivan Showing These Signs?
A failing ECM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your engine’s computer needs attention:
- âś” Persistent Check Engine Light (CEL)
- âś” Engine stalling or shutting off while driving
- âś” No-start or hard-starting conditions
- âś” Noticeable decrease in fuel efficiency
- âś” Rough idling or poor engine performance
- âś” Failure to pass an emissions test
- âś” Communication error codes, such as P0601, P0606, or U0100
Your Straightforward Installation Guide
Replacing the ECM on your Terraza is a manageable job for a DIYer with basic tools. Following these steps will ensure a smooth process.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes to allow the system’s capacitors to discharge.
- Locate the ECM: On the 2006 Terraza, the Engine Control Module is typically found in the engine compartment on the driver’s side, near the firewall or air filter housing.
- Disconnect the Wiring: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. There are usually a few bolts or nuts holding it in place.
- Install the New Module: Mount your new, pre-programmed 2006 Terraza Engine Module onto the bracket and secure it with the original hardware.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new ECM until they click into place. Reconnect the negative battery terminal.
- Final Steps: Your 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. Start the engine and check for proper operation.
Verified Compatibility for Your Vehicle
This ECM, part number 12590032, is a direct replacement for a wide range of GM vehicles. It is interchangeable with service numbers 12602044, 12603530, 12605843, 12607096, 12630457, and 19210737. Please verify your vehicle is on the list below to ensure proper fitment.
COLORADO 08 Electronic Control Module; (RH firewall)
ENVOY 07-08 Electronic Control Module; 5.3L (LH engine)
ENVOY 08 Electronic Control Module; 4.2L (LH engine), ID 12607096
G6 09 Electronic Control Module; (LH front engine compartment), 3.6L, ID 19210737
MONTE CARLO 06 Electronic Control Module; (lower part of air cleaner box), 3.5L
XLR 09 Electronic Control Module; (RH front engine compartment), ID 12607096
AURA 08-09 Electronic Control Module; (RH firewall), 2.4L, w/hybrid
DTS 06 Electronic Control Module
DEVILLE 05 Electronic Control Module; (LH engine compartment), ID 12590032
G6 07 Electronic Control Module; (LH front engine compartment), 3.6L, ID 12605843
IMPALA 06 Electronic Control Module; (lower part of air cleaner box), 3.5L
LACROSSE 08-09 Electronic Control Module; (lower air cleaner housing), 5.3L
STS 06 Electronic Control Module; (LH frame rail), 4.4L
TRAILBLAZER 08 Electronic Control Module; (LH engine), ID 12636660
UPLANDER 09 Electronic Control Module; (LH engine compartment), (3.9L)
ISUZU ASCENDER 08 Electronic Control Module; (4.2L, LH engine), ID 19210737
SAAB 9-7X 07 Electronic Control Module; (LH engine), 8 cylinder
TRAILBLAZER 07 Electronic Control Module; (LH engine), 5.3L
ENCLAVE 08 Electronic Control Module; (behind fan shroud), ID 19210737
LUCERNE 08 Electronic Control Module; (lower part of air cleaner box), 4.6L, ID 12607096
MONTE CARLO 06 Electronic Control Module; (lower part of air cleaner box), 3.9L
RAINIER 07 Electronic Control Module; (LH engine), 5.3L
ISUZU ASCENDER 08 Electronic Control Module; (4.2L, LH engine), ID 12607096
CTS 06 Electronic Control Module; (RH engine compartment), V-Series, ID 12603530
STS 08 Electronic Control Module; (LH frame rail), 4.6L
G6 06 Electronic Control Module; (LH front engine compartment), ID 12603530
G6 08 Electronic Control Module; (LH front engine compartment), 3.6L
ION 06 Electronic Control Module; 2.4L (opt LE5)
MALIBU 06 Electronic Control Module; 3.9L
MALIBU 08 Electronic Control Module; new style (emblem in bumper cover), 2.4L, w/hybrid
RELAY 06 Electronic Control Module; (LH engine compartment), 3.9L
VUE 08-09 Electronic Control Module; 2.4L, VIN Z (8th digit, opt LAT)
OUTLOOK 08 Electronic Control Module; (behind fan shroud)
SOLSTICE 06 Electronic Control Module; (LH front frame rail)
VUE 08 Electronic Control Module; 3.6L
VUE 09 Electronic Control Module; 3.6L, VIN 7 (8th digit, opt LY7)
ACADIA 07-08 Electronic Control Module; (behind fan shroud), ID 12607096 (ECM)
AURA 08-09 Electronic Control Module; (RH firewall), 3.6L
ENVOY 08 Electronic Control Module; 4.2L (LH engine), ID 19210737
G6 07 Electronic Control Module; (LH front engine compartment), 3.6L, ID 12603530
GRAND PRIX 08 Electronic Control Module; (lower air cleaner box), 5.3L
HHR 06 Electronic Control Module; (LH rear engine compartment), 2.4L
STS 08 Electronic Control Module; (LH frame rail), 4.4L
G6 07 Electronic Control Module; (LH front engine compartment), 3.6L, ID 12590032
ISUZU I-290 08 Electronic Control Module; (RH firewall)
LUCERNE 06 Electronic Control Module; (lower part of air cleaner box), 4.6L
MALIBU 09-10 Electronic Control Module; 2.4L, w/hybrid
UPLANDER 08 Electronic Control Module; (LH engine compartment), (3.9L), ID 19210737
IMPALA 06 Electronic Control Module; (lower part of air cleaner box), 3.9L
MONTANA 06 Electronic Control Module; (LH engine compartment), (SV6), 3.9L
TRAILBLAZER 08 Electronic Control Module; (LH engine), ID 19210737
ENVOY 08 Electronic Control Module; 4.2L (LH engine), ID 12636660
G6 07 Electronic Control Module; (LH front engine compartment), 3.6L, ID 12602044
TRAILBLAZER 08 Electronic Control Module; (LH engine), ID 12607096
TRAILBLAZER 09 Electronic Control Module; (LH engine), 4.2L
CANYON 08 Electronic Control Module; (RH firewall)
COBALT 06 Electronic Control Module; (LH front engine compartment), 2.4L (VIN B, 8th digit, 4-146)
ISUZU I-370 08 Electronic Control Module; (RH firewall)
MALIBU 09 Electronic Control Module; 3.6L
SRX 08 Electronic Control Module; (LH engine compartment), (4.6L)
SAAB 9-7X 08 Electronic Control Module; (LH engine), 5.3L
ENCLAVE 08 Electronic Control Module; (behind fan shroud), ID 12607096
G6 09 Electronic Control Module; (LH front engine compartment), 3.6L, ID 12607096
IMPALA 08-09 Electronic Control Module; (lower part of air cleaner box), 5.3L
XLR 06 Electronic Control Module; (RH front engine compartment), 4.4L
XLR 08 Electronic Control Module; (RH front engine compartment)
ENVOY 09 Electronic Control Module; (LH engine), 4.2L
G6 07 Electronic Control Module; (LH front engine compartment), 3.6L, ID 12607096
G6 07 Electronic Control Module; (LH front engine compartment), 3.6L, ID 12618163
LUCERNE 08 Electronic Control Module; (lower part of air cleaner box), 4.6L, ID 19210737
MONTANA 08-09 Electronic Control Module; (LH engine compartment)
PURSUIT 06 Electronic Control Module; (LH front engine compartment), 2.4L
VUE 10 Electronic Control Module; 3.6L
ACADIA 08 Electronic Control Module; (behind fan shroud), ID 19210737 (PCM)
DTS 08 Electronic Control Module
TERRAZA 06 Electronic Control Module; (LH engine compartment), 3.9L
TRAILBLAZER 07 Electronic Control Module; (LH engine), 6.0L
SAAB 9-7X 08 Electronic Control Module; (LH engine), 6.0L
HUMMER H3 08 Electronic Control Module; (RH firewall)
MALIBU 08 Electronic Control Module; new style (emblem in bumper cover), 3.6L
UPLANDER 08 Electronic Control Module; (LH engine compartment), (3.9L), ID 12607096
UPLANDER 06 Electronic Control Module; (LH engine compartment), 3.9L
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the ECM with the exact software and calibrations for your specific vehicle. This ensures perfect compatibility with your engine, transmission, and options package, preventing potential performance and communication issues.
Is this a simple plug-and-play installation?
Yes, because we program the module to your VIN before shipping, it is ready to be installed without needing a trip to the dealer. In some cases, a simple security relearn procedure (often just turning the key on for 10-15 minutes) is all that’s needed to sync the module with your vehicle’s anti-theft system.
Will this fix my ‘No Communication’ code?
In many cases, yes. A common failure mode for these ECMs is internal damage that disrupts communication on the vehicle’s data bus, leading to codes like U0100. Replacing a faulty ECM is often the correct fix for these issues, but you should always ensure your battery and main power/ground connections are solid first.
What if I have the wrong part number?
This module replaces several different GM service numbers. As long as your vehicle is on the compatibility list and you provide your VIN, we will ensure the programming is correct for your application, even if the number on your old part is slightly different from 12590032.
Do I need any special tools for the job?
No special tools are required. Basic hand tools like a socket set and ratchet are typically all you need to access and replace the module. The most important thing is to disconnect the battery first for safety.