Restore Your Van’s Core Performance and Reliability
Is your 2005-2007 GMC Savana 1500 van running rough, stalling unexpectedly, or showing a persistent Check Engine Light? These are classic signs that the brain of your vehicle—the Powertrain Control Module (PCM)—is failing. As a technician with over two decades of experience, I’ve seen firsthand how a faulty PCM can cause a cascade of frustrating issues, from poor fuel economy to erratic transmission shifting. This isn’t just an inconvenience; for a work van, it’s a direct hit to your bottom line. This replacement PCM, part number 12589462, is the definitive solution to get your dependable workhorse back on the road, running as it should.
The biggest hurdle in replacing a modern engine computer is the programming. This module eliminates that obstacle. We flash it with the latest official GM software updates, precisely matched to your van’s Vehicle Identification Number (VIN) before it ever leaves our facility. This means no expensive trips to the dealership, no special programming tools required. It arrives at your door ready for a straightforward installation, saving you both time and money.
A Technician’s Notebook
I remember a 2006 Express van that came into the shop with a complaint of random stalling at stoplights. The owner had already replaced the fuel pump and a few sensors, chasing the problem. Scans showed no consistent codes, just a few random communication errors. After checking the wiring harnesses for the third time, we decided to monitor the PCM’s live data. We noticed the processor would intermittently drop out. We swapped in a pre-programmed PCM, and the problem vanished instantly. It’s a textbook example of how a failing 2005-2007 Savana 1500 PCM can mimic other component failures, making a direct replacement the only true fix.
Is Your GM Vehicle Showing These Symptoms?
- ✔ Unexplained Check Engine Light illumination.
- ✔ Engine stalling, stumbling, or hesitating.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Decreased fuel mileage.
- ✔ The vehicle fails to start, even with a good battery and starter.
- ✔ Diagnostic Trouble Codes (DTCs) stored, such as P0601, P0606, or U0100.
A Straightforward Guide to Installation
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electronic component replacement.
- ✔ Locate the PCM: On most Savana and Express vans, the PCM is located in the engine compartment, typically on the driver’s side rear area. On trucks like the Silverado, it’s often under the battery tray.
- ✔ Disconnect Connectors: Carefully unlatch and remove the electrical wiring harness connectors from the old module. Inspect them for any corrosion or damage.
- ✔ Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- ✔ Install the New Module: Mount your new, pre-programmed PCM securely onto the bracket.
- ✔ Reconnect Everything: Firmly plug the wiring harness connectors into the new module. Reconnect the negative battery terminal.
- ✔ Perform Security Relearn: A security relearn procedure may be necessary for your vehicle to start. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. Consult your owner’s manual for the specific procedure for your model.
Will This Fit My GM Vehicle?
This module is a direct replacement for part numbers 12589462, 12602801, and 89017749. It is confirmed to fit a wide range of GM vehicles, including but not limited to:
- Chevrolet Express / GMC Savana Vans (1500, 2500, 3500): 2005-2007
- Chevrolet Silverado / GMC Sierra Pickups (1500, 2500, 3500): 2005-2007 (including Classic models)
- Chevrolet Suburban / Yukon XL 2500: 2005-2006 (with 8.1L engine)
- Chevrolet Avalanche 2500: 2005-2006
- Chevrolet Blazer S10 / GMC Jimmy S15: 2005
- GMC Safari / Chevrolet Astro: 2005
- Cadillac CTS-V: 2004-2005
Please provide your VIN upon purchase to ensure we send you a perfectly matched and programmed 2005-2007 Savana 1500 PCM for your specific application.
Why do I need to provide my VIN?
Your Vehicle Identification Number (VIN) allows us to access the exact factory calibration file for your specific vehicle. This ensures the engine, transmission, and all related systems operate exactly as GM intended, accounting for the original engine, transmission, and emissions equipment.
Is this a simple plug-and-play installation?
Yes, because we program the module to your VIN before shipping, it is designed to be a direct replacement. In most cases, you will only need to perform a standard security relearn procedure after installation, which requires no special tools.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both engine performance and transmission shift points. If the module is faulty, it can send incorrect signals to the transmission, causing harsh or erratic shifting. Replacing a bad PCM often resolves these issues.
What if my original part number is different?
This module is a direct replacement for several part numbers, including 12589462, 12602801, and 89017749. As long as your vehicle is on the compatibility list, this module will function correctly once programmed to your VIN.
Do I need to send my old PCM (core) back?
No core charge or return is required for this purchase. You can recycle your old module locally.