Restore Peak Performance and Drive with Confidence
Is your truck or SUV suffering from frustrating issues like intermittent stalling, poor fuel mileage, or a persistent check engine light? These are common signs that the heart of your vehicle’s electronics, the Powertrain Control Module (PCM), is failing. Don’t let a faulty computer keep you off the road. This replacement PCM, part number 12586242, is the definitive, hassle-free solution to bring back the smooth, reliable performance you depend on. We take the guesswork out of the repair by pre-programming the module to your vehicle’s unique VIN, ensuring it’s ready to install right out of the box.
Warning Signs and How to Overcome Them
A failing PCM can cause a cascade of confusing problems. If you’re experiencing any of the following, this module is your answer:
- ✔ Unexplained Check Engine Light illumination
- ✔ Diagnostic Trouble Codes (DTCs) related to internal module failure (e.g., P0601, P0602, P0605, P0606)
- ✔ Rough or inconsistent engine idle
- ✔ Harsh or erratic automatic transmission shifting
- ✔ A sudden drop in fuel economy
- ✔ Engine stalling, stumbling, or complete no-start conditions
- ✔ Communication errors with diagnostic scan tools
Guided Installation to Restore Peace of Mind
Replacing the PCM is a straightforward job you can tackle with basic hand tools. Our pre-programming service makes it a simple plug-and-drive process. Regain control of your vehicle and your weekend with these easy steps:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work. This prevents accidental shorts and protects the sensitive electronics.
- Locate the Old Module: On most compatible vehicles, the PCM is found in the engine bay, either on the driver’s side fender well (under the battery tray) or next to the air filter box.
- Disconnect and Remove: Carefully unplug the large electrical connectors. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket.
- Install the New PCM: Mount your new, pre-programmed module in the same location. Securely plug in the electrical connectors until they click, ensuring a solid connection.
- Reconnect and Start: Reconnect the negative battery terminal. In some cases, a security relearn procedure may be necessary, which typically involves cycling the key. Your vehicle’s manual will have specific instructions. Start the engine and enjoy a restored, smooth-running vehicle.
Expert Insight: The Power of VIN-Specific Programming
As a technician, I’ve seen countless drivers try to save a few dollars with a used computer from a salvage yard, only to find it won’t work. That’s because a PCM is not a one-size-fits-all part. It’s programmed with specific data for the original vehicle’s engine, transmission, and options. Our VIN programming service isn’t just a convenience—it’s essential. We load your new module with the latest GM software updates for your exact vehicle, ensuring all systems communicate perfectly for optimal performance and efficiency from the moment you turn the key.
Tailored Fit for Your 2004 Escalade EXT PCM and More
This module is a direct replacement for service number 12586242 and is guaranteed to be compatible with a wide range of 2004 General Motors vehicles. Please verify your original part or service number (often found on a sticker on the module itself) matches one of the following to ensure perfect fitment:
Part Numbers: 12586242, 19299226, 89017738
Service Numbers (Broadcast Codes): YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, YHTN
Compatible Models Include:
- 2004 Avalanche 1500
- 2004 Cadillac Escalade, ESV, EXT
- 2004 Chevrolet SSR
- 2004 Chevrolet Silverado 1500, 2500, 3500 (Gasoline)
- 2004 Chevrolet Suburban 1500, 2500
- 2004 Chevrolet Tahoe
- 2004 Chevrolet Trailblazer EXT (5.3L)
- 2004 GMC Envoy XL, XUV (5.3L)
- 2004 GMC Sierra 1500, 2500, 3500 (Gasoline) & Denali
- 2004 GMC Yukon, XL 1500, XL 2500
- 2004 Hummer H2
- 2004 Isuzu Ascender (5.3L)
- 2004 Buick Rainier (5.3L)
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, you will receive an email prompting you for your vehicle’s 17-digit VIN. You can also add it to the ‘notes’ section during checkout. We cannot ship your part until we receive the VIN.
Is any additional programming required after installation?
In most cases, no. Our programming covers the engine and transmission. However, some GM vehicles require a simple ‘Security Relearn’ or ‘Crankshaft Variation Relearn’ procedure, which can be done without special tools. We include instructions for these common procedures.
Is this a direct replacement for my service number?
Yes, this unit replaces a wide range of original part and service numbers. As long as your vehicle is on the compatibility list and your original module carries one of the listed numbers (like 12586242 or YFKJ), this part is a guaranteed match.
What if my check engine light is on for something else?
This PCM will only solve issues directly caused by a faulty computer. We highly recommend having your vehicle scanned for diagnostic trouble codes before ordering to confirm the PCM is the source of the problem. This module will not fix mechanical issues or faulty sensors.
How long does the programming process take?
Programming is typically completed within one business day of receiving your VIN, allowing us to ship your ready-to-install part promptly.