Restore Your Minivan’s Performance and Reliability
Is your 2008 or 2009 Chevrolet Uplander suffering from frustrating and unpredictable engine problems? A faulty Engine Control Module (ECM) is often the culprit behind issues like random stalling, a persistent check engine light, poor fuel economy, or even a complete no-start condition. As the central computer for your engine, the ECM’s health is critical for proper operation. This direct-fit replacement ECM, part number 12630457, is the definitive solution to get your vehicle running smoothly again.
Over my 20+ years in automotive diagnostics, I’ve seen countless vehicles sidelined by ECM failure. Heat cycles, vibration, and age can cause internal components to fail, leading to confusing symptoms that can be difficult to trace. This module is your opportunity to bypass expensive diagnostic guesswork and dealer programming fees. We take care of the most complex part for you: each unit is professionally programmed with the latest GM software updates specifically for your vehicle’s VIN. This ensures perfect communication between all onboard systems, restoring the engine’s original efficiency and power curve.
From the Diagnostic Bay: The Uplander That Wouldn’t Cooperate
A customer brought in a 2009 Uplander with a classic intermittent problem: it would run fine for days, then suddenly stall at a stoplight and refuse to restart for an hour. There were no consistent trouble codes, just a frustrating U0100 (Lost Communication with ECM) that would pop up occasionally. After verifying power and ground integrity to the ECM connectors—a critical first step—we suspected an internal module failure triggered by heat soak. Swapping in a pre-programmed module like this one resolved the issue instantly. The customer saved hundreds compared to a dealership visit and was back on the road with a reliable family vehicle the same day.
Diagnosing a Failing Engine Computer
If you’re experiencing any of the following, a faulty module is a likely cause. Replacing your 2008-2009 Uplander ECM can be the most effective repair.
- ✔ Check Engine Light is illuminated with communication-related codes (e.g., P0601, P0606, U0100).
- ✔ The engine cranks but will not start.
- ✔ Unexplained drops in fuel efficiency.
- ✔ Rough idling, stalling, or hesitation during acceleration.
- ✔ Seemingly unrelated error messages on the dashboard.
- ✔ Transmission shifting issues or erratic behavior.
A Straightforward Guide to Installation
Installing your new 2008-2009 Uplander ECM is a manageable job for a DIYer with basic tools. In the Uplander, the ECM is located in the left-hand (driver’s side) engine compartment.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to ensure all modules have powered down.
- Locate the ECM: Find the module on the driver’s side of the engine bay. It will have several large electrical connectors attached.
- Disconnect Connectors: Carefully release the locking tabs on each wiring harness connector 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. Keep the hardware, as you may need it for the new installation.
- Install the New Module: Mount your new, pre-programmed ECM onto the bracket and securely tighten the bolts.
- Reconnect Everything: Plug the wiring harnesses back into the correct sockets on the new module until they click into place. Reconnect the negative battery terminal.
- Final Steps: Some vehicles may require a security relearn procedure, which can typically be done without special tools. Turn the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeat two more times before starting the engine.
Verified Vehicle Compatibility List
This ECM is a direct replacement for service number 12630457 and is interchangeable with part numbers 12590032, 12602044, 12603530, 12605843, 12607096, and 19210737. It fits a wide range of GM vehicles. Please match your vehicle, year, and engine options below to ensure compatibility.
UPLANDER 08-09 (3.9L)
COLORADO 08
IMPALA 06 (3.5L, 3.9L), 08-09 (5.3L)
MONTE CARLO 06 (3.5L, 3.9L)
TRAILBLAZER 07-09
…and many more from Buick, Cadillac, GMC, Pontiac, Saturn, Isuzu, and Saab.
Frequently Asked Questions
Do I need to do any programming myself?
No. This is the main benefit of our service. We program the Engine Control Module to your car’s specific Vehicle Identification Number (VIN) before we ship it. It arrives ready for installation, with no need for a trip to the dealership for expensive programming.
Where do I find my vehicle’s VIN?
Your 17-digit VIN can be found on your vehicle’s registration, insurance card, or on the driver’s side of the dashboard, visible through the windshield. Please provide this number to us after purchase to ensure correct programming.
Is this a direct replacement for my original ECM?
Yes. This module is designed to be a direct-fit replacement for the original factory part, matching all physical connections and electronic protocols. It replaces multiple service numbers, including 12630457, 12607096, and 19210737, among others.
What if my part number isn’t an exact match but my vehicle is listed?
This module is a superseded part that replaces several older service numbers. As long as your vehicle model, year, and engine are on the compatibility list, this module will function correctly once programmed to your VIN.