Restore Peak Performance to Your GM Truck or SUV
Is your truck suffering from frustrating issues like a persistent check engine light, rough idling, stalling, or poor fuel economy? These are often signs that the brain of your vehicle, the Powertrain Control Module (PCM), is failing. Don’t let a faulty computer keep you off the road. This replacement PCM, service number 12586242, is the definitive solution to bring back the smooth, reliable performance you depend on. We take the guesswork out of the repair by programming it specifically for your vehicle using your VIN, ensuring it arrives ready for a straightforward installation.
Warning Signs and How to Overcome Them
A failing PCM can manifest in numerous ways, disrupting your vehicle’s drivability and your peace of mind. By replacing your old unit with this pre-programmed module, you can solve these common problems:
- ✔ Eliminate Stalling and No-Start Conditions: Regain the confidence that your vehicle will start every time and run without unexpected shutdowns.
- ✔ Smooth Out Rough Idle and Hesitation: Enjoy a steady, powerful engine response without the shuddering and sputtering of a confused computer.
- ✔ Correct Poor Fuel Mileage: Restore your engine’s efficiency by ensuring the correct air-fuel mixture and ignition timing.
- ✔ Clear Persistent Check Engine Lights: Resolve diagnostic trouble codes (DTCs) related to the module itself, such as P0600, P0601, P0606, and other communication errors.
- ✔ Fix Erratic Transmission Shifting: Allow for crisp, predictable gear changes by restoring proper communication between the engine and transmission.
An Expert’s Diagnostic Tip
Before replacing your PCM, I always recommend a quick but crucial check. Take a moment to inspect your battery terminals for corrosion and ensure your main engine and chassis grounds are clean and tight. A poor ground connection can mimic PCM failure by causing voltage drops and communication errors. A healthy electrical foundation is key to a successful repair and the longevity of your new module.
Guided Installation for Your 2004 Escalade EXT PCM
Getting your truck back in top shape is easier than you think. This module is designed for a direct fit, and with our VIN programming, the most complex part is already done for you. Follow these simple steps for a confident installation.
- Safety First: Begin by disconnecting the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the Old Module: On most compatible trucks and SUVs, you’ll find the PCM in the engine bay, on the driver’s side, under the battery or next to the airbox.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old PCM. There are typically release tabs that need to be depressed. Once disconnected, unbolt the module from its mounting bracket.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely re-attach the electrical connectors. You should hear a click as they lock into place.
- Reconnect Power: Re-attach the negative battery terminal. The vehicle may need to complete a security relearn procedure, which typically involves cycling the key in the ignition. Consult your owner’s manual for specific steps if required.
Guaranteed Compatibility for Your GM Vehicle
This PCM is the correct replacement for a wide range of 2004 GM vehicles. To ensure a perfect match, please verify that your original module has one of the following service numbers: 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, or YHTN. This part is a confirmed fit for the following models:
- 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)
- 2004 GMC Sierra Denali
- 2004 GMC Yukon, XL 1500, XL 2500
- 2004 Hummer H2
- 2004 Buick Rainier (5.3L)
- 2004 Isuzu Ascender (5.3L)
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming for you before shipment. We flash the module with the latest GM-certified software using the VIN you provide, so it’s ready to install right out of the box.
How do I provide my VIN?
After you complete your purchase, you can send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive this information, as it’s essential for correct programming.
Will I need to perform a security relearn procedure?
In many cases, yes. Most GM vehicles of this era require a simple security relearn (often called a CASE relearn or Passlock relearn) to sync the new PCM with your vehicle’s anti-theft system. This procedure is straightforward and can usually be done in your driveway with just the ignition key.
Is this a used part?
This is a high-quality, tested, and verified component sourced from original equipment. Each unit is meticulously inspected and programmed to ensure it meets or exceeds factory specifications for performance and reliability.
What if my part number isn’t on the list?
If your service number is not listed in the description, please contact us with your vehicle’s information. We have a vast inventory and can help you find the exact module you need for your specific application.