Restore Peak Performance and Drive with Confidence
Is your truck or SUV suffering from baffling electrical issues, poor performance, or a stubborn check engine light? An aging or failing engine computer can cause a host of frustrating problems, from rough idling and erratic shifting to a complete no-start condition. It’s time to stop the guesswork and restore the heart of your vehicle’s operations. This Powertrain Control Module (PCM), service number 12586242, is the definitive, reliable solution, arriving at your door pre-programmed with the latest GM software specifically for your vehicle’s VIN.
Signs Your Engine Computer Needs Attention
If you’re experiencing any of the following, a failing PCM is a likely culprit. This replacement module is designed to resolve these common headaches and get you back to a smooth, dependable drive:
- ✔ Persistent Check Engine Light with codes like P0601, P0602, or P0606.
- ✔ Unpredictable or harsh transmission shifting.
- ✔ Engine stalling, sputtering, or refusing to start.
- ✔ A noticeable drop in fuel efficiency.
- ✔ Communication failures with diagnostic scan tools.
- ✔ Intermittent electrical problems that seem to have no other cause.
A Word From The Garage
Before installing your new PCM, take five minutes to inspect and clean your battery terminals and the main engine-to-chassis ground strap. A poor ground connection can create voltage issues that mimic the symptoms of a failed computer. Ensuring these connections are clean and tight is a simple step that guarantees your new module can perform its job perfectly from the moment you turn the key.
Guided Installation for Your 2004 Silverado 1500 PCM
Replacing your PCM is a straightforward job you can tackle with basic hand tools. Our goal is to make this repair as simple as possible, which is why we handle all the complex programming for you. Just follow these steps for a confident fix.
- Safety First: Begin by disconnecting the negative terminal of your vehicle’s battery to prevent any electrical shorts.
- Locate the Module: On most trucks like the Silverado and Sierra, the PCM is located on the driver’s side, under the battery tray in the engine bay. On SUVs like the Trailblazer and Envoy, it’s typically found next to the airbox.
- Disconnect Connectors: Carefully unplug the large wiring harness connectors from the old module. They have locking tabs that need to be released before they can be pulled away.
- Remove the Old Unit: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New PCM: Mount your new, pre-programmed module in the same location, ensuring it’s secure.
- Reconnect Everything: Firmly plug the wiring harnesses into the new PCM until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn: Your vehicle’s anti-theft system may need to be synchronized with the new PCM. This is a simple procedure that typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. Your vehicle’s manual will have the exact steps.
Guaranteed Fitment for Your Vehicle
This module is a direct replacement for service number 12586242 and is compatible with a wide range of 2004 GM vehicles. It also interchanges with service numbers 19299226, 89017738, and broadcast codes YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN. Please verify your service number or contact us with your VIN to confirm compatibility.
- Cadillac: Escalade, Escalade ESV, Escalade EXT
- Chevrolet: Avalanche 1500, Silverado (1500, 2500, 3500), SSR, Suburban (1500, 2500), Tahoe, Trailblazer EXT
- GMC: Envoy XL, Envoy XUV, Sierra (1500, 2500, 3500, Denali), Yukon, Yukon XL
- Hummer: H2
- Buick: Rainier
- Isuzu: Ascender
Frequently Asked Questions
Do I need to do any programming or flashing?
No. We handle all the programming for you. Simply provide your vehicle’s VIN during checkout, and we will flash the module with the latest GM-certified software for your specific vehicle. It arrives ready for installation.
What is the security relearn procedure?
The security relearn, or ‘key relearn,’ synchronizes the new PCM with your vehicle’s anti-theft system. For most 2004 GM vehicles, it involves a 30-minute process of cycling the ignition key. We include detailed instructions to make this final step easy.
Will this fix my transmission problems?
In many cases, yes. The PCM controls engine performance and transmission shift points. If your hard or erratic shifting is caused by faulty computer logic, this new module will correct it and restore smooth operation.
Where is my VIN?
You can find your 17-digit Vehicle Identification Number (VIN) on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Is this part difficult to install myself?
Not at all. If you are comfortable using basic hand tools like a wrench or socket set, this is a very manageable DIY job. Since the programming is already done, it’s a true ‘unbolt the old, bolt in the new’ process, followed by the simple security relearn.