Restore Peak Performance to Your GM Truck or Van
Is your Chevrolet Express, GMC Savana, or Silverado suffering from frustrating issues like a persistent check engine light, poor fuel mileage, erratic shifting, or even a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that manages your vehicle’s engine and transmission. Don’t let a faulty module keep your reliable workhorse off the road. This direct-replacement PCM, part number 12589462, is the definitive solution to restore your vehicle’s factory performance and reliability.
Unlike sourcing a part from a junkyard, this module arrives at your door fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We install the latest, most stable software updates directly from GM, ensuring optimal communication between all vehicle systems. This critical programming step eliminates the need for an expensive trip to the dealership for flashing, saving you time and money. It’s a true plug-and-play solution designed for both professional technicians and savvy DIYers.
From the Diagnostic Bay
We had a 2006 Silverado 2500 with the 8.1L engine come into the shop with a complaint of a random, harsh 1-2 shift and a check engine light for a transmission solenoid circuit. The owner had already replaced the solenoid pack in the transmission, but the problem persisted. After checking the wiring harness and finding no issues, we suspected the PCM. The internal driver for that specific solenoid was failing intermittently. We installed one of our VIN-programmed modules, performed a quick security relearn, and the truck shifted perfectly. The customer was back on the road in under an hour, problem solved.
Symptoms of a Failing 2005-2007 Express 2500 PCM
A failing PCM can manifest in various ways, often mimicking other component failures. If you’ve replaced sensors or other parts without success, your PCM may be the culprit. Look out for these common symptoms:
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Unexplained engine misfires or a rough idle.
- ✔ A significant drop in fuel economy.
- ✔ Harsh, delayed, or erratic automatic transmission shifting.
- ✔ The engine cranks but refuses to start.
- ✔ Communication error codes (U-codes) when scanned.
- ✔ Vehicle intermittently stalling while driving or at a stop.
The Importance of VIN Programming
Your vehicle’s VIN is more than just a serial number; it’s a blueprint containing critical information about its engine, transmission, emissions equipment, and factory options. Programming this 2005-2007 Express 2500 PCM with your VIN ensures that the module operates with the correct parameters for your exact build. This guarantees seamless integration, proper engine and transmission function, and compliance with emissions standards. Simply provide us with your 17-digit VIN during checkout, and we’ll handle the rest.
This module is a direct replacement for several GM part numbers, including 12589462, 12602801, and 89017749. Please verify the part number on your original module or consult our comprehensive fitment list below to ensure compatibility.
Guaranteed Fitment For These Vehicles:
This Electronic Control Module is a confirmed fit for a wide range of GM vehicles. Please check your specific model and options below:
- ASTRO 05: Electronic Control Module; (LH front by battery)
- AVALANCHE 2500 05-06: Electronic Control Module; (LH front under battery)
- BLAZER S10/JIMMY S15 05: Electronic Control Module; (RH front engine compartment)
- CTS 04-05: Electronic Control Module; (RH engine compartment), V-Series, ID 12589462 or 12602801
- EXPRESS 1500 VAN 05-07: Electronic Control Module; (LH rear engine compartment)
- EXPRESS 2500 VAN 05-07: Electronic Control Module; (LH rear engine compartment), gasoline
- EXPRESS 3500 VAN 05-07: Electronic Control Module; (LH rear engine compartment), gasoline
- SAFARI (GMC) 05: Electronic Control Module; (LH front by battery)
- SAVANA 1500 VAN 05-07: Electronic Control Module; (LH rear engine compartment)
- SAVANA 2500 VAN 05-07: Electronic Control Module; (LH rear engine compartment), gasoline
- SAVANA 3500 VAN 05-07: Electronic Control Module; (LH rear engine compartment), gasoline
- SIERRA 1500 PICKUP 05-06: Electronic Control Module; (LH front under battery), w/o hybrid option; w/4.3L
- SIERRA 1500 PICKUP 07: Electronic Control Module; classic style (creased door skin), (LH front under battery), w/o hybrid option; w/4.3L
- SIERRA 2500 PICKUP 05-06: Electronic Control Module; (LH front under battery), gasoline, 8.1L
- SIERRA 2500 PICKUP 07: Electronic Control Module; classic style (creased door skin), (LH front under battery), gasoline, 8.1L
- SIERRA 3500 PICKUP 05-06: Electronic Control Module; (LH front under battery), gasoline, 8.1L
- SIERRA 3500 PICKUP 07: Electronic Control Module; classic style (creased door skin), (LH front under battery), gasoline, 8.1L
- SILVERADO 1500 PICKUP 05-06: Electronic Control Module; (LH front under battery), w/o hybrid option; w/4.3L
- SILVERADO 1500 PICKUP 07: Electronic Control Module; classic style (creased door skin), (LH front under battery), w/o hybrid option; w/4.3L
- SILVERADO 2500 PICKUP 05-06: Electronic Control Module; (LH front under battery), gasoline, 8.1L
- SILVERADO 2500 PICKUP 07: Electronic Control Module; classic style (creased door skin), (LH front under battery), gasoline, 8.1L
- SILVERADO 3500 PICKUP 05-06: Electronic Control Module; (LH front under battery), gasoline, 8.1L
- SILVERADO 3500 PICKUP 07: Electronic Control Module; classic style (creased door skin), (LH front under battery), gasoline, 8.1L
- SUBURBAN 2500 05-06: Electronic Control Module; (LH front under battery), 8.1L
- YUKON XL 2500 05-06: Electronic Control Module; (LH front under battery), 8.1L
Frequently Asked Questions
Do I need to have this PCM programmed by a dealer?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s 17-digit VIN when you place your order, and it will arrive ready to install with the latest GM software.
What is a VIN and where do I find it?
The VIN (Vehicle Identification Number) is your car’s unique 17-digit identifier. You can typically find it on a plate on the driver’s side dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Is installation difficult? Will I need special tools?
Installation is generally straightforward. It involves disconnecting the battery, unplugging the electrical connectors, and unbolting the old module. While no special tools are typically needed for the physical swap, some vehicles may require a security relearn procedure (also known as a CASE relearn) after installation, which can often be done without a scan tool. Instructions are widely available online for this process.
Where is the PCM located on my 2007 Express Van?
On the 2005-2007 Express and Savana vans, the PCM (or ECM) is typically located in the engine compartment, on the driver’s side, often near the battery or firewall.
Will this part fix my check engine light?
If your check engine light is on due to an internal failure of the PCM, then yes, this part will resolve the issue. It is always recommended to have the trouble codes read by a scanner first to properly diagnose the problem before replacing parts.
What part numbers does this module replace?
This module is a direct, compatible replacement for GM service numbers 12589462, 12602801, and 89017749.