Restore Your Vehicle’s Brain and End Engine Frustration
If you’re dealing with a frustrating no-start condition, a persistent check engine light, or erratic engine behavior in your 2007 Buick Rainier, the root cause is often the Engine Control Module (ECM). As a technician with over 20 years of experience, I’ve seen countless vehicle owners and even professional shops chase their tails replacing sensors, only to find the problem was the computer all along. This isn’t just a replacement part; it’s a definitive solution to restore your vehicle’s performance and reliability.
This ECM, part number 12602044, is the central command center for your engine. It governs everything from fuel mixture and ignition timing to transmission shift points and emissions controls. When it fails, the symptoms can be widespread and confusing. We take the guesswork and high dealership costs out of the equation by providing a high-quality ECM that is professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN) before it ever leaves our facility. This ensures it has the latest GM software updates for optimal function.
Case Study: A Tricky Diagnosis
I remember a 2007 Trailblazer with the 5.3L V8 (which uses the same ECM as the Rainier) that came into my shop. The owner had already spent over $700 replacing the throttle body and multiple O2 sensors trying to fix a stalling issue and a P0606 code (ECM/PCM Processor Fault). The vehicle would run fine for a few minutes, then stumble and die. After verifying the wiring and power/ground circuits to the ECM were solid, we knew the internal processor was failing intermittently. We installed one of our VIN-programmed modules, performed the security relearn, and the truck ran perfectly. It’s a classic example of how a faulty ECM can mimic other component failures, making a direct replacement like this the most effective repair.
Is Your Vehicle Exhibiting These ECM Failure Signs?
A failing ECM can manifest in numerous ways. If you’re experiencing any of the following, this module is the likely solution your vehicle needs.
- âś” Check Engine Light is on with communication-related or internal processor fault codes (e.g., P0601, P0606, U0100).
- âś” The engine will not start or is very difficult to start.
- âś” Noticeable decrease in fuel economy.
- âś” The engine stalls, stumbles, or misfires for no apparent reason.
- âś” Automatic transmission shifts harshly or at the wrong times.
- âś” Loss of power and poor acceleration.
A Straightforward Guide to Installation
Installing your new 2007 Rainier Engine Control Module is a manageable task for a DIYer with basic tools. The key is our pre-programming service, which handles the most complex part for you. After installation, a simple security relearn procedure is typically required, which does not need a scan tool.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the ECM: On the 2007 Buick Rainier, the ECM is typically found in the engine bay, mounted on the left-hand (driver’s side) of the engine.
- Disconnect the Old Module: Carefully unplug the wiring harness connectors. These usually have locking tabs that need to be released before pulling.
- Swap the Modules: Unbolt the old ECM from its mounting bracket and set the new module in its place, securing it with the original hardware.
- Reconnect Everything: Firmly plug the wiring harnesses into your new ECM until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn: Turn the key to the ‘ON’ position (without starting the engine) for 10-15 minutes. The security light should turn off. Turn the key off for 10 seconds, then the vehicle should start and run normally.
Verified Vehicle Compatibility
This ECM is a direct-fit replacement for a wide range of General Motors vehicles. It is interchangeable with service numbers: 12590032, 12602044, 12603530, 12605843, 12607096, 12630457, and 19210737. Please verify your vehicle is on the list below. Providing your VIN at checkout is mandatory to ensure we send you a perfectly matched and programmed unit.
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
What exactly is VIN programming?
VIN programming is the process where we load your vehicle’s unique 17-digit Vehicle Identification Number into the ECM. This ensures the computer has the correct software and calibrations for your specific engine, transmission, and factory options. It’s a critical step for proper function and allows the module to communicate correctly with the other computers in your vehicle.
Do I need to take my car to a dealer after installation?
No. Because we program the module to your VIN before shipping, you do not need to visit a dealer or mechanic for programming. You will only need to perform the simple, tool-free security relearn procedure detailed in our installation guide.
How do I provide my VIN?
After you complete your purchase, you will need to send us your VIN. You can typically add it to the ‘notes’ section at checkout or reply to your order confirmation email. We cannot ship your part until we receive the VIN.
Is this the correct 2007 Rainier Engine Control Module for my vehicle?
This module fits the 2007 Buick Rainier with the 5.3L engine. It also fits a wide variety of other GM vehicles, as listed above. The best way to confirm is to match the service number on your current ECM to one of the interchangeable numbers listed (12602044, 12590032, etc.). Providing your VIN guarantees we will send the correct, programmed part.