Restore Peak Performance to Your GM Workhorse
Is your GMC Savana or Chevrolet Express van suddenly stalling, refusing to start, or throwing a check engine light that just won’t go away? These frustrating and often unpredictable issues frequently point to a failing Powertrain Control Module (PCM), the central computer of your vehicle. When the PCM malfunctions, it can disrupt everything from fuel delivery and ignition timing to transmission shifting, leaving your reliable work van dead in the water. This isn’t just an inconvenience; it’s lost time and money.
We offer a dependable and straightforward solution. This is a high-quality replacement PCM, meticulously programmed to your vehicle’s specific Vehicle Identification Number (VIN). We install the latest, most stable software updates from GM, ensuring your engine and transmission operate exactly as the manufacturer intended. By handling the programming before we ship, we eliminate the need for an expensive trip to the dealership for flashing. This is a true plug-and-play fix designed to get you back on the road with confidence.
Case Study: A Tricky Diagnosis
A few months back, a 2006 Express 2500 came into my shop with a complaint that stumped two other mechanics: it would randomly stall at idle after warming up, but never threw a consistent code. Sometimes we’d see a P0601 (Internal Control Module Memory Check Sum Error), but it would clear and not return for days. After checking all the usual suspects—fuel pressure, crank sensor, wiring—I hooked up my lab scope to the 5-volt reference circuit supplied by the PCM. Sure enough, after 20 minutes of idling, I saw the voltage signal become erratic and then drop out completely, killing the engine. The PCM was failing internally under heat soak. Swapping in a VIN-programmed module like this one provided an immediate, permanent fix. These intermittent electrical gremlins are classic signs of a dying computer.
Is Your Work Van Showing These Signs?
A faulty PCM can manifest in numerous ways. If you’re experiencing any of the following, your engine computer is a likely culprit:
- ✔ Check Engine Light is illuminated, often with codes like P0601, P0606, or other internal processor faults.
- ✔ Engine cranks but refuses to start.
- ✔ Unexplained stalling or rough, erratic idling.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ No communication with your scan tool, or loss of communication codes (U-codes).
- ✔ Apparent failure of multiple sensors at once.
A Straightforward Guide to Installation
One of the biggest benefits of this 2005-2007 Savana 2500 PCM is that it arrives ready to install. No special computer equipment is needed. For a typical Savana or Express van, the process is simple:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait 10 minutes for the system capacitors to discharge.
- Locate the Module: On most 2005-2007 Savana and Express vans, the PCM is located in the engine compartment on the driver’s side, towards the rear firewall.
- Disconnect Connectors: Carefully unlatch and remove the electrical harness connectors from the old PCM. Inspect them for any corrosion or damage.
- Remove the Old PCM: Unbolt the module from its mounting bracket. It’s typically held in by a few small bolts.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely fasten the bolts.
- Reconnect Everything: Firmly plug the electrical connectors back into the new module until they click into place. Reconnect your negative battery terminal.
- Final Steps: Your vehicle may require a security relearn procedure, which can typically be done by cycling the key. In most cases, the vehicle will start and run correctly immediately.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 12589462, 12602801, and 89017749. It is guaranteed to fit the following vehicles (please match your specific options):
- Chevrolet Express / GMC Savana 1500, 2500, 3500 Vans (2005-2007)
- Chevrolet Silverado / GMC Sierra 1500, 2500, 3500 Pickups (2005-2007 Classic) – including 4.3L V6 and 8.1L V8 gasoline models
- Chevrolet Suburban 2500 / Yukon XL 2500 (2005-2006) – with 8.1L V8
- Chevrolet Avalanche 2500 (2005-2006)
- Chevrolet Blazer S10 / GMC Jimmy S15 (2005)
- GMC Safari / Chevrolet Astro (2005)
- Cadillac CTS-V (2004-2005) – matching specific ID numbers
IMPORTANT: After your purchase, you must provide us with your vehicle’s 17-digit VIN. This is essential for us to program the 2005-2007 Savana 2500 PCM correctly for your specific application, ensuring a seamless installation and proper function.
Frequently Asked Questions
Do I need to take my van to a dealer for programming after installation?
No. We program the module to your specific VIN before we ship it to you. It arrives ready to be installed, saving you time and money on dealership programming fees.
What is a PCM and what does it do?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It controls all aspects of engine and transmission operation, including fuel injection, spark timing, emissions systems, and shift points, to ensure optimal performance and efficiency.
Where is the PCM located on a 2007 Savana 2500?
On the 2005-2007 Savana and Express vans, the PCM is typically found in the engine compartment on the driver’s side (LH), mounted near the rear of the engine bay.
What happens if I forget to provide my VIN?
We cannot ship your order without the VIN. Programming is a critical step that tailors the module’s software to your vehicle’s specific systems and options. We will contact you to request the VIN if it is not provided at checkout.
Will this fix my specific problem?
This module will resolve issues directly caused by a failing PCM. While the symptoms listed are common indicators, proper vehicle diagnosis is always recommended to confirm the PCM is the point of failure before ordering.