Restore Your Truck’s Heartbeat and Performance
Is your dependable GM truck or SUV suddenly acting up? Stalling at intersections, shifting erratically, or displaying a stubborn check engine light can be incredibly frustrating, turning your reliable workhorse into a source of daily stress. These aren’t just annoyances; they’re signs that the very brain of your vehicle—the Powertrain Control Module (PCM)—may be failing. This isn’t just a part; it’s the key to restoring the smooth power, crisp shifting, and worry-free confidence you deserve from your vehicle. We offer a direct, reliable solution: a professionally programmed PCM, part number 12586242, flashed with the latest GM software and tailored specifically to your vehicle’s VIN.
Warning Signs Your PCM Needs Attention
A failing engine computer can manifest in numerous ways, often mimicking other mechanical problems. If you’re experiencing any of the following, this module is the likely solution to get you back on the road with peace of mind.
- ✔ Check Engine Light: Specifically for codes like P0601 (Internal Control Module Memory Check Sum Error), P0604, or P0606.
- ✔ Engine Performance Issues: Noticeable loss of power, poor acceleration, stumbling, or a significant drop in fuel economy.
- ✔ No-Start Condition: The engine cranks but refuses to start, even with a good battery and starter.
- ✔ Erratic Transmission Shifting: Harsh, delayed, or unpredictable gear changes that make driving uncomfortable and unsafe.
- ✔ Intermittent Stalling: The engine cuts out unexpectedly while driving or idling, creating a dangerous situation.
- ✔ Communication Errors: Your scan tool is unable to communicate with the PCM, a definitive sign of a module issue.
A Mechanic’s Note: The Ghost in the Machine
“I once had a customer with a 2004 Sierra 1500 who had spent thousands chasing a phantom misfire. He’d replaced plugs, coils, injectors—you name it. The truck ran fine one day, terribly the next. He was at his wit’s end. We finally hooked up a scope and saw the injector control signal from the PCM was dropping out intermittently. We installed a VIN-programmed module, just like this one, and the truck immediately ran like it just rolled off the showroom floor. It wasn’t a mechanical failure; it was a digital one. That’s the peace of mind this part provides—it eliminates the guesswork and solves the core problem.”
The Solution: A Pre-Programmed 2004 Silverado 3500 PCM
Forget the hassle and expense of a dealership visit. We simplify the process by programming this module for you before it ships. Just provide your vehicle’s VIN during checkout, and our technicians will flash the unit with the correct, updated calibration for your specific make, model, and engine. This ensures that when it arrives, it’s ready for a straightforward installation, restoring factory performance and reliability.
Guided Installation to Restore Your Ride
Replacing the PCM is a manageable job for a confident DIYer. Follow these steps for a successful installation.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the Module: On most trucks and full-size SUVs like the Silverado, Sierra, and Tahoe, the PCM is located under the hood on the driver’s side, often under or next to the battery tray. On models like the Envoy and Trailblazer, it’s typically next to the airbox.
- Disconnect and Remove: Carefully unplug the 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 reconnect the electrical harnesses, ensuring they click into place.
- Reconnect Power: Reattach the negative battery terminal and tighten it.
- Security Relearn Procedure: Your vehicle’s anti-theft system (PassLock/PassKey) will need to sync with the new PCM. This is a simple procedure: Turn the key to the ‘ON’ position for 10-15 minutes, then turn it off for 10 seconds. Repeat this cycle three times. On the fourth try, the vehicle should start.
Tailored Fit for Your GM Vehicle
This module is a direct replacement for service number 12586242 and is compatible with a wide range of 2004 GM models. Please verify your service number or match your vehicle from the list below to ensure a perfect fit.
Compatible Service Numbers: 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, YHTN
Fits Models Including:
- 2004 Chevrolet Avalanche, Silverado 1500/2500/3500, SSR, Suburban, Tahoe, Trailblazer EXT
- 2004 GMC Envoy XL/XUV, Sierra 1500/2500/3500, Sierra Denali, Yukon, Yukon XL
- 2004 Cadillac Escalade, Escalade ESV, Escalade EXT
- 2004 Buick Rainier
- 2004 Hummer H2
- 2004 Isuzu Ascender
Do I need to program this module after I receive it?
No. The main benefit of our service is that we program the module to your vehicle’s specific VIN before we ship it. It arrives ready for installation and the security relearn procedure.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive this information.
Is a CASE relearn required?
For optimal performance and to prevent a potential check engine light for code P0315, a Crankshaft Position Sensor (CASE) relearn is recommended. Most professional scan tools can perform this procedure in a few minutes after the PCM is installed.
Will this fix my transmission problems?
If your transmission issues, such as harsh or erratic shifting, are caused by faulty electronic commands from the PCM, then yes, this part will resolve them. It will not fix internal mechanical failures within the transmission itself.
What if my original part number is not on the list?
Please contact us with your vehicle’s VIN and the service number from your original module. We can verify compatibility and ensure you receive the correct part for your application.