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? As the central computer of your vehicle, a failing Powertrain Control Module (PCM) can cause a host of frustrating and difficult-to-diagnose issues. From poor fuel economy to harsh shifting and even no-start conditions, a faulty PCM can bring your work or travel to a grinding halt. This isn’t just an inconvenience; it’s a hit to your productivity and peace of mind.
We offer a straightforward, reliable solution. This is a genuine replacement PCM, compatible with part number 12589462, that arrives at your door fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We flash it with the latest official GM software updates, which often correct underlying drivability issues the original module never addressed. This means you’re not just replacing a part; you’re getting a component that ensures your engine and transmission operate exactly as the manufacturer intended, restoring lost power and efficiency.
A Technician’s Notebook
I remember a 2006 Express van that came into the shop with a classic intermittent no-start. The owner, a plumber, was losing jobs because he couldn’t rely on his van. We checked the battery, starter, and fuel pump—all were fine. The scanner showed a P0601 (Internal Control Module Memory Check Sum Error), but only sometimes. After hours of chasing wires, we swapped in a known-good PCM, and the problem vanished. The original module’s internal processor was failing under certain temperature conditions. We installed one of our pre-programmed units, and he was back in business the same day, no dealership trip required. These failures are common, and a reliable, pre-flashed module is the fastest path to a permanent fix.
Is Your GM Van or Truck Showing These Signs?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, your module may be the culprit. A proper diagnosis is always recommended, but these are classic symptoms I’ve seen hundreds of times in my career.
- ✔ Unexplained Check Engine Light with codes like P0601, P0602, P0606, or U0100.
- ✔ The engine cranks but refuses to start.
- ✔ Rough idling, stalling, or hesitation during acceleration.
- ✔ Noticeable decrease in fuel mileage.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication errors with diagnostic scan tools.
A Straightforward Guide to Installation
Installing your new 2005-2007 Savana 1500 PCM is a manageable job for a DIYer with basic tools. The key is taking your time and being careful with the electrical connectors.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most Savana and Express vans, the PCM is located in the engine compartment on the driver’s side, towards the rear. On trucks like the Silverado, it’s often under the battery tray. Always verify the location for your specific model.
- Disconnect the Connectors: Carefully unlatch and remove the electrical harness connectors from the old PCM. These connectors have locking tabs; do not force them. 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 onto the bracket and securely fasten the bolts.
- Reconnect Everything: Plug the harness connectors firmly into the new module until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn: In most cases, you will need to perform a simple security relearn procedure (often called a Passlock or anti-theft relearn) to sync the new PCM with your vehicle’s keys. This procedure typically takes about 30 minutes and does not require special tools. We can provide instructions for this.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 12589462, 12602801, and 89017749. It is guaranteed to fit a wide range of GM vehicles. Please confirm your model and year from the list below.
- Astro / Safari (GMC): 2005
- Avalanche 2500: 2005-2006
- Blazer S10 / Jimmy S15: 2005
- Cadillac CTS: 2004-2005 (V-Series, check ID)
- Express / Savana 1500 Van: 2005-2007
- Express / Savana 2500 Van: 2005-2007
- Express / Savana 3500 Van: 2005-2007
- Silverado / Sierra 1500 Pickup: 2005-2007 (Classic style, 4.3L)
- Silverado / Sierra 2500 Pickup: 2005-2007 (Classic style, 8.1L Gasoline)
- Silverado / Sierra 3500 Pickup: 2005-2007 (Classic style, 8.1L Gasoline)
- Suburban 2500 / Yukon XL 2500: 2005-2006 (8.1L)
Frequently Asked Questions
Why do you need my VIN?
Your VIN (Vehicle Identification Number) is essential. It allows us to load the exact, correct GM factory software for your van’s specific engine, transmission, and options. This ensures perfect compatibility and performance, eliminating guesswork.
Is this a plug-and-play part?
Almost! Because we pre-program it, you will not need a dealer’s scan tool for software flashing. However, you will need to perform a simple Anti-Theft Relearn procedure (instructions available) so the module recognizes your keys. This typically takes 30 minutes.
Will this fix my transmission shifting problems?
If the shifting issues are caused by faulty electronic commands from the PCM, then yes, this is very likely to solve the problem. The PCM controls shift points and line pressure. However, it will not fix internal mechanical failures within the transmission itself.
What if my part number is slightly different?
This module directly replaces part numbers 12589462, 12602801, and 89017749. If your number is different, please contact us before ordering to ensure we can provide the correct, compatible unit for your vehicle.
Do I need to send my old PCM back?
This purchase does not require a core return. You can keep your old module, though we always recommend recycling old electronics responsibly.