Restore Peak Performance to Your GM Truck or SUV
Is your 2004 Chevrolet Silverado 1500, or another compatible GM vehicle, running poorly? The Powertrain Control Module (PCM) is the central computer of your vehicle, responsible for managing everything from fuel mixture and ignition timing to transmission shifting and emissions control. When it fails, it can cause a wide range of frustrating and difficult-to-diagnose problems. This replacement PCM, part number 12586242, is the definitive solution to get your truck back on the road, running smoothly and reliably.
Unlike a generic part from a local store, this module is not just a piece of hardware. It’s a complete solution, professionally programmed with the latest GM-authorized software updates specifically for your vehicle’s VIN. This critical step ensures that all systems communicate correctly and that your engine operates at peak efficiency and power, just as the manufacturer intended. By providing us with your VIN upon purchase, you receive a unit that is ready for installation right out of the box, saving you a costly trip to the dealership for programming.
From the Diagnostic Bay
We had a 2004 Sierra 2500 come into the shop with a classic case of intermittent stalling and a P0601 (Internal Control Module Memory Check Sum Error) code that would come and go. The owner had already replaced the crank sensor and fuel pump with no success. After verifying all power and ground circuits to the PCM were solid, we knew the module itself was the culprit. Swapping in a VIN-programmed unit like this one solved the problem instantly. The truck fired right up, idled smoothly, and the code never returned. Don’t chase ghosts in the machine—a faulty PCM requires a reliable, correctly programmed replacement.
Is Your Vehicle Showing Signs of PCM Failure?
- ✔ Persistent Check Engine Light (CEL) that won’t clear, especially with communication-related codes (U-codes) or internal processor codes (P06xx).
- ✔ Unexplained drop in fuel economy.
- ✔ Engine stalling, stumbling, or running rough for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Complete no-start condition where the engine cranks but won’t fire up.
- ✔ Intermittent electrical issues that seem to have no logical cause.
- ✔ Failure to pass an emissions test.
The Direct Solution: A Programmed 2004 Silverado 1500 PCM
Choosing the right replacement is critical. This module is guaranteed to be a direct fit for vehicles requiring service number 12586242 and a host of other compatible numbers. Our programming service is what sets this part apart. We flash the unit with your vehicle’s specific calibration files using your VIN. This process not only makes the module compatible with your truck’s options and systems but also installs any available software improvements from GM that have been released since your truck was new. These updates can resolve common drivability issues, improve transmission logic, and enhance overall performance.
Installation is straightforward for a DIY mechanic or professional technician. Once installed, you will need to perform a simple security relearn procedure, which does not require any special tools. This syncs the new PCM with your vehicle’s anti-theft system and can typically be done in your own driveway.
Guaranteed Compatibility and Fitment
This Electronic Control Module is a direct replacement for a wide range of 2004 GM trucks and SUVs. It is compatible with multiple service numbers, including 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN. It fits models such as the Chevrolet Silverado, Suburban, Tahoe, Avalanche, SSR; GMC Sierra, Yukon; Cadillac Escalade; Hummer H2; and more. To ensure a perfect match, simply verify your original part number and provide us with your vehicle’s VIN during checkout.
Frequently Asked Questions
Do I need to have this computer programmed by a dealer?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN when you place your order, and the module will arrive ready to be installed with the latest GM software updates for your specific vehicle.
What is a security relearn procedure?
The security relearn, or anti-theft relearn, is a simple process that syncs the new PCM to your vehicle’s existing keys. It typically involves cycling the ignition key on and off in a specific sequence. We include clear, easy-to-follow instructions for this procedure with your order. No special scan tools are required.
Where is the PCM located on my 2004 GM truck?
On most 2004 GM full-size trucks and SUVs like the Silverado, Sierra, Tahoe, and Suburban, the PCM is located in the engine compartment on the driver’s side, under the battery tray or near the fender well.
How do I know for sure that my PCM is the problem?
While the symptoms listed above are strong indicators of PCM failure, it’s always best to have a proper diagnosis performed. Key indicators are diagnostic trouble codes pointing to internal module failure (like P0601, P0606) or a complete loss of communication with the scan tool. Checking for solid power and ground connections at the PCM connector is a crucial first step before ordering a replacement.
Will this fit my vehicle if my service number isn’t 12586242?
Yes, this module is a direct replacement for numerous service numbers. Please check the full list in our description, which includes YFKD, YFKF, YFKH, YFKJ, YFXL, and many others. As long as your original service number is on our compatibility list, this part will work perfectly once programmed to your VIN.