Restore Peak Performance to Your GM Truck or Van
Is your Silverado, Sierra, or Express van running rough, shifting erratically, or refusing to start? Are you battling a persistent Check Engine Light with codes that point to the engine’s computer? The Powertrain Control Module (PCM), often called the Electronic Control Module (ECM), is the brain of your vehicle’s operation. When it fails, it can cause a cascade of frustrating and difficult-to-diagnose issues. This direct-fit PCM, part number 12602801, is the definitive solution to restore your vehicle’s reliability and performance.
This isn’t just a generic part off a shelf. We provide a crucial service that makes installation straightforward: we program the module specifically to your vehicle using the VIN you provide. This ensures that all factory settings, engine parameters, and transmission controls are perfectly matched to your truck’s original specifications. It arrives ready for installation, loaded with the latest GM software updates to optimize fuel efficiency, emissions, and overall drivability.
From the Diagnostic Bay
We had a 2006 Silverado 2500 with the 8.1L engine towed in. The customer had spent a fortune chasing what he thought was a transmission problem. The truck would shift hard, sometimes getting stuck in gear, and the speedometer would drop to zero intermittently. He had already replaced the vehicle speed sensor and a transmission solenoid pack with no luck. After hooking up our scanner, we noticed communication errors with the PCM. Instead of throwing more parts at the transmission, we inspected the PCM connectors for corrosion—they were clean. We swapped in a known-good, programmed PCM, and every single issue disappeared instantly. The original PCM had internal circuit failure that was corrupting the data stream to the transmission control module, making it seem like a transmission fault. It’s a classic case of the brain sending bad signals to the body.
Symptoms of a Failing Powertrain Control Module
- ✔ Check Engine Light: The most common sign, often with communication-related (U-codes) or internal processor fault codes (P06xx codes).
- ✔ No-Start or Hard Starting: The PCM controls fuel injection and spark timing. If it fails, the engine may crank but not start.
- ✔ Poor Engine Performance: You might experience rough idling, stalling, hesitation, or a significant loss of power.
- ✔ Reduced Fuel Economy: An improperly functioning PCM can’t efficiently manage the engine’s fuel-to-air ratio, leading to wasted gas.
- ✔ Erratic Transmission Shifting: The PCM works with the TCM to control shift points. Failure can lead to harsh shifts, delayed shifting, or getting stuck in one gear.
- ✔ Intermittent Stalling: The vehicle may run fine for a while and then suddenly stall for no apparent reason, sometimes restarting after it cools down.
The Right Solution: A Programmed 2005-2007 Silverado PCM
Don’t let a faulty computer keep your reliable GM truck off the road. This replacement module is the core of your vehicle’s powertrain management system. By ordering from us, you bypass the expensive dealership programming fees and lengthy wait times. We handle the critical programming step before we ship, so you receive a component that is ready for the final installation steps. It directly replaces original part numbers 12589462, 12602801, and 89017749, ensuring broad compatibility across a wide range of GM models including the Silverado, Sierra, Savana, Express, Suburban, and more. Please verify your vehicle in the fitment list below and be prepared to provide your VIN upon purchase.
Installation Note
While this module comes programmed to your VIN, many GM vehicles of this era require a security relearn procedure (often called Passlock or Passkey) and a Crankshaft Variation Relearn (CASE relearn) after installation. These procedures can often be performed without a high-end scan tool and instructions are widely available. This ensures the new PCM communicates correctly with your vehicle’s anti-theft system and crankshaft position sensor for optimal timing and misfire detection.
Frequently Asked Questions
What is the difference between a PCM and an ECM?
For most modern vehicles, the terms are used interchangeably. PCM (Powertrain Control Module) is technically more accurate as it controls both the engine (Engine Control Module – ECM) and the transmission (Transmission Control Module – TCM) functions within a single unit.
Is this module truly plug-and-play?
It is pre-programmed to your vehicle’s VIN, which handles the most complex part of the job. However, you will likely need to perform a security relearn and a CASE relearn procedure after installation. This is a standard requirement for GM vehicles of this generation to sync the new module with your specific vehicle.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship the module until we receive and program it with your VIN.
Will this fix my vehicle’s specific problem?
This PCM will resolve issues directly caused by a faulty original module. It’s crucial to properly diagnose the problem. If you have symptoms like a no-start condition, communication error codes, or multiple unrelated sensor codes, the PCM is a very likely culprit.
Where is the PCM located on my truck?
On most Silverado and Sierra pickups from this era, the PCM is located in the engine bay on the driver’s side, under or near the battery tray. On Express and Savana vans, it’s typically in the left rear of the engine compartment.