Restore Peak Performance to Your GM Vehicle
Is your truck or van running rough, stalling unexpectedly, or showing a persistent Check Engine Light? A failing Powertrain Control Module (PCM) is often the culprit. As the central computer of your vehicle, the PCM manages everything from fuel mixture and ignition timing to transmission shifting. When it falters, the symptoms can be frustrating and difficult to diagnose. This isn’t just a replacement part; it’s a complete, reliable solution. We provide a high-quality PCM, part number 12589462, that comes fully programmed with the latest GM factory software specific to your vehicle’s VIN. This critical step ensures seamless integration and performance, eliminating the need for an expensive trip to the dealership for programming.
A Technician’s Notebook
I remember a 2006 Savana 2500 work van that came into my bay with a maddeningly intermittent no-start condition. The owner had already replaced the battery, starter, and fuel pump. It would start fine for a week, then leave him stranded. No codes were consistently stored, just a random U0100 (Lost Communication with ECM/PCM) every so often. After checking all the power and ground circuits to the module—a step many people skip—we found they were solid. On a hunch, we connected a scope and saw the 5-volt reference signal intermittently dropping out. That’s a classic sign of an internal PCM failure. We installed a VIN-programmed module just like this one, and the van never had the issue again. It saved the owner from endless guesswork and lost work time.
Is Your GM Vehicle Showing These Signs?
A faulty PCM can manifest in numerous ways. If you’re experiencing any of the following, it might be time for a replacement. Catching it early can prevent damage to other components, like the catalytic converter.
- âś” Check Engine Light is illuminated with codes like P0601, P0602, or P0606 (Internal Control Module Processor Error).
- âś” The engine cranks but refuses to start.
- âś” Rough idling, stalling, or hesitation during acceleration.
- âś” Noticeable decrease in fuel economy.
- âś” Harsh or erratic automatic transmission shifting.
- âś” Failure to pass an emissions inspection.
- âś” Communication errors with diagnostic scan tools.
A Straightforward Guide to Installation
Replacing your 2005 GMC Safari PCM is a job most DIYers with basic tools can handle. The key is our VIN programming, which makes it a true plug-and-play process. Always consult a service manual for your specific vehicle, but here are the general steps:
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: The location varies. On many GM trucks and vans like the Silverado or Express, it’s under the hood on the driver’s side, often under or near the battery tray. On S10/Jimmy models, it may be on the passenger side.
- Disconnect Connectors: Carefully release the locking tabs on the electrical harness connectors and pull them straight out from the module. Never force them. Inspect the pins for any corrosion or damage.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s typically held in by a few small bolts (often 10mm).
- Install the New Module: Mount your new, pre-programmed PCM securely in the bracket.
- Reconnect Everything: Plug the electrical connectors back into the new module until they click firmly into place. Reconnect the negative battery terminal.
- Security Relearn (If Needed): In most cases, our programming handles this. However, some GM vehicles may require a simple security relearn procedure (often involves turning the key on for 10-15 minutes). Your vehicle will not start until this is completed. Instructions are readily available online for your specific model.
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 confirm your model and options before ordering.
ASTRO 05 (LH front by battery)
BLAZER S10/JIMMY S15 05 (RH front engine compartment)
CTS 04-05 V-Series (RH engine compartment)
AVALANCHE 2500 05-06 (LH front under battery)
SUBURBAN 2500 05-06 8.1L (LH front under battery)
YUKON XL 2500 05-06 8.1L (LH front under battery)
EXPRESS/SAVANA 1500, 2500, 3500 VANS 05-07 Gasoline (LH rear engine compartment)
SILVERADO/SIERRA 1500 05-07 Classic, 4.3L (LH front under battery)
SILVERADO/SIERRA 2500/3500 05-07 Classic, 8.1L Gasoline (LH front under battery)
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential for us to program the Powertrain Control Module with the correct software for your specific engine, transmission, emissions system, and factory options. This ensures your vehicle runs exactly as the manufacturer intended.
Is any additional programming required after installation?
No. This PCM arrives pre-programmed and ready for installation. In some cases, a simple security relearn procedure, which you can do yourself in about 15 minutes, may be necessary. A Crankshaft Position Sensor (CASE) relearn might be needed to clear a P1336 code, which can be done with a capable scan tool, but the vehicle will run and drive without it.
What is the difference between an ECM and a PCM?
ECM stands for Engine Control Module, while PCM means Powertrain Control Module. In modern vehicles like yours, the module controls both the engine and the transmission, so PCM is the more accurate term. They are often used interchangeably.
Will this fix my transmission shifting problems?
If the harsh or erratic shifting is caused by a faulty module sending incorrect signals, then yes, this new PCM will resolve the issue. The PCM plays a direct role in controlling transmission line pressure and shift points based on data from various sensors.
How do I provide my VIN?
After completing your purchase, simply send us a message with your 17-digit VIN. We cannot ship your order until we receive this information, as the programming is a required step.