Is Your GM Truck or SUV Acting Up? Get a Reliable, Plug-and-Play Solution.
If you’re experiencing baffling electrical gremlins, poor performance, or a no-start condition in your 2004 GM vehicle, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer, the PCM controls everything from fuel injection and spark timing to transmission shifting. When it fails, it can cause a cascade of frustrating and hard-to-diagnose issues. This isn’t just a replacement part; it’s a direct solution, programmed specifically for your vehicle to restore its original performance and reliability.
Common Symptoms of a Failing GM PCM & Your Solution
Don’t let a faulty computer keep your vehicle off the road. If you’re noticing any of the following, it’s a strong indicator that your PCM needs replacement:
- Erratic or harsh transmission shifting
- Unexplained stalling or engine hesitation
- Complete no-start condition, even with a good battery and starter
- Check Engine Light (CEL) with multiple, unrelated trouble codes
- Poor fuel economy
- Communication errors with diagnostic scan tools
This Programmed 12586242 PCM is the definitive fix for these problems. We take the guesswork out of the repair by flashing the module with the latest GM-certified software updates, tailored precisely to your vehicle’s Vehicle Identification Number (VIN). This ensures perfect compatibility and function right out of the box.
Features & Benefits
- ✔ VIN-Specific Programming Included: Your PCM arrives ready for installation. We flash it using your VIN, which means no expensive trips to the dealership for programming.
- ✔ Latest GM Software Updates: We load the most current software available from General Motors, ensuring optimal engine performance, fuel efficiency, and transmission strategy.
- ✔ Guaranteed Compatibility: This unit is a direct replacement for service numbers 12586242, 19299226, 89017738 and many others. Simply match your number to confirm the fit.
- ✔ Plug-and-Play Installation: Once you receive the module, the physical installation is straightforward. In most cases, you can have your vehicle running again in under an hour.
- ✔ One-Year Warranty: This unit is backed by our one-year replacement warranty for your complete peace of mind.
An Expert’s Note on VIN Programming: As a technician, I’ve seen countless vehicle owners buy a used computer from a salvage yard, only to find it causes more problems. A PCM from a 5.3L Silverado won’t work correctly in a 6.0L Escalade, even if they look identical. It can lead to transmission damage, security system lockouts, and incorrect engine parameters. Our VIN programming service isn’t just a convenience—it’s a critical step that ensures every single parameter, from injector flow rate to shift points, is perfectly matched to the exact configuration your vehicle had when it left the factory.
Frequently Asked Questions
Do I need to do any programming after I receive this PCM?
No. This Programmed 12586242 PCM is flashed with your vehicle’s specific VIN and the latest GM software before it ships. It is ready for installation upon arrival. The only additional step that may be required is a Crankshaft Position Sensor (CASE) relearn, which can be done with a capable scan tool.
How do I provide my vehicle’s VIN?
After you complete your purchase, you will need to send us your 17-digit VIN. We cannot program and ship the module without it. Please double-check your VIN for accuracy to ensure a perfect match.
Where is the PCM located on my 2004 GM vehicle?
Location varies slightly by model. On full-size trucks and SUVs (like the Sierra, Silverado, Tahoe, Escalade), it’s typically located on the driver’s side of the engine bay, under the battery tray. On mid-size SUVs (like the Trailblazer, Envoy, Rainier), it’s usually found under the hood next to the air filter box.
What if my original part number isn’t on the list?
The provided list of service numbers (12586242, YFKD, etc.) covers a wide range of applications. However, if you don’t see your exact number, please contact us with your VIN and original part number before ordering. We will be happy to verify compatibility for you.
What is a CASE Relearn and is it difficult?
A Crankshaft Position (CASE) Relearn is a procedure that synchronizes the new PCM with your engine’s crankshaft position sensor. This is required to prevent a P1336 trouble code. Most automotive repair shops can perform this procedure in a few minutes, and many high-end consumer scan tools also have this capability.
Will this fix my check engine light?
If the check engine light was caused by an internal failure of the original PCM, then yes, this part will resolve the issue. After installation, we recommend clearing all diagnostic trouble codes (DTCs) and driving the vehicle to ensure no new codes appear.