Is Your GM Van or Truck Running Rough?
If your 2005-2007 GMC Savana 3500, Chevrolet Express, or another compatible GM vehicle is suffering from mysterious engine problems, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer of your vehicle, the PCM is responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When it starts to fail, it can cause a cascade of frustrating and difficult-to-diagnose issues. This replacement PCM, part number 12589462, is the definitive solution to restore your vehicle’s performance, reliability, and efficiency.
The Plug-and-Play Solution for Your 2005-2007 Savana 3500 Van PCM
Don’t waste time and money at the dealership. We provide a simple, direct-fit solution. This module is not a blank slate; it arrives at your door pre-programmed specifically for your vehicle. Using the Vehicle Identification Number (VIN) you provide at checkout, we flash the unit with the latest, most stable software updates directly from GM. This ensures perfect compatibility with your vehicle’s specific configuration, engine, and transmission, eliminating the need for expensive programming tools or a trip to a mechanic for setup. It’s designed to be a straightforward installation for the confident DIYer or any professional technician.
From the Diagnostic Bay
We had a 2006 Express 3500 work van come into the shop that was driving the owner crazy. The van would randomly stall at idle, had a harsh 1-2 shift, and the check engine light would come on and off with a dozen different codes that didn’t seem related. The owner had already replaced the throttle body and multiple sensors with no luck. After checking the wiring harnesses for damage, we hooked up our scope to the main PCM connectors. We found erratic voltage signals on several key sensor inputs, a classic sign of internal module failure. We installed one of our VIN-programmed PCMs, performed the security relearn, and the van ran like new. All the ghost codes vanished, the shifting smoothed out, and the stalling was gone for good. It’s a reminder that sometimes the ‘brain’ is the problem, not the ‘body’.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is on with various, often unrelated, trouble codes (DTCs).
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A complete no-start condition where the engine cranks but won’t fire up.
- ✔ Poor fuel economy and a noticeable loss of engine power.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Intermittent issues that get worse as the engine warms up.
Guaranteed Compatibility and Reliability
This Powertrain Control Module is a direct replacement for multiple GM part numbers, including 12589462, 12602801, and 89017749. It is compatible with a wide range of GM trucks and vans from the mid-2000s, including the Chevrolet Silverado, GMC Sierra, Suburban, Avalanche, and more. Please verify the fitment list to ensure it matches your specific model and engine option. By providing your VIN, you guarantee that the module you receive is correctly calibrated for your vehicle’s systems, ensuring a seamless and effective repair.
Installation is generally straightforward. The PCM is typically located in the engine bay, often on the driver’s side near the battery. After disconnecting the battery, you can unbolt the old module, disconnect the wiring harnesses, and install the new one. In most cases, a simple security relearn procedure (often called a ‘key-on/key-off’ cycle) is required to sync the new PCM with your vehicle’s anti-theft system. This procedure can be done without any special tools and instructions are widely available.
Frequently Asked Questions
Do I need to get this PCM programmed?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during or after checkout, and we will flash the module with the latest GM software specific to your vehicle.
Where is the PCM located on my 2005-2007 Savana or Express van?
On these vans, the PCM (or ECM) is typically located in the engine compartment on the driver’s side, often near the rear of the engine bay or firewall. On trucks like the Silverado or Sierra, it’s usually found on the driver’s side fender well, under or near the battery tray.
What is a security relearn procedure?
A security relearn, or anti-theft relearn, is a simple procedure that syncs the new PCM to your vehicle’s existing keys and security system. It usually involves a series of key-on/key-off cycles. This is a necessary step to allow the vehicle to start after the new module is installed.
Will this fix my check engine light?
If the check engine light and associated codes are being caused by a faulty PCM, then yes, this part will resolve the issue. However, it’s crucial to ensure other components like sensors or wiring are not the root cause of the problem.
Is this compatible with other part numbers?
Yes, this module is a direct replacement for part numbers 12589462, 12602801, and 89017749, covering a wide range of GM vehicles. Please check the detailed fitment list on this page to confirm compatibility.