Restore Peak Performance to Your GM Truck or SUV
Is your Escalade, Tahoe, or Sierra running rough, stalling unexpectedly, or throwing confusing check engine light codes? A failing Powertrain Control Module (PCM), the computer brain of your vehicle, is often the culprit. Over my 20 years in diagnostics, I’ve seen firsthand how a faulty PCM can cause a cascade of frustrating issues, from poor fuel economy to a complete no-start condition. This isn’t just a part; it’s the central command for your engine and transmission, and when it falters, your vehicle’s reliability is compromised.
We offer a dependable solution: a replacement PCM, part number 12602802, that arrives at your door fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We load the newest, most stable software updates from GM, ensuring optimal performance and resolving many of the common glitches found in the original factory programming. This eliminates the need for an expensive trip to the dealership for programming, putting you back in control of your repair.
A Technician’s Notebook
I remember a 2005 Yukon XL that came into the shop with a complaint of intermittent stalling at stoplights and bizarrely, the radio cutting out at the same time. The owner had already replaced the battery and alternator. A scan revealed a P0606 (PCM Processor Fault) code. These internal processor faults are a dead giveaway. After confirming power and grounds to the module were solid, we installed one of our VIN-programmed PCMs. The fix was immediate—smooth idle, no more stalling, and the radio issue vanished. It’s a classic example of how the 2003-2006 Escalade PCM and its counterparts in other GM trucks can cause symptoms that seem unrelated to the engine.
Is Your GM Truck Showing These Telltale Signs?
A failing engine computer can manifest in numerous ways. If you’re experiencing any of the following, a faulty PCM could be the root cause. Look out for these common indicators:
- ✔ Check Engine Light is on with codes like P0601, P0602, P0606, or U0100
- ✔ Vehicle refuses to start or has trouble turning over
- ✔ Unexplained drop in fuel mileage
- ✔ Engine stalling, stuttering, or misfiring
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Communication issues with diagnostic scan tools
A Straightforward Guide to Installation
Replacing the PCM on these GM vehicles is a job most DIYers can handle with basic tools. Our pre-programmed module makes it a simple swap. Follow these general steps to get your truck running right:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental reconnection.
- Locate the PCM: On most compatible models like the Escalade, Silverado, and Tahoe, the PCM is located in the engine bay on the driver’s side, often under or next to the battery tray.
- Disconnect the Wiring: Carefully unplug the electrical connectors from the old PCM. These connectors have locking tabs that need to be released. Take your time to avoid damaging the pins or clips.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s typically held in place by a few small bolts (commonly 7mm or 10mm).
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely fasten the bolts.
- Reconnect Everything: Plug the wiring harnesses back into the new module, ensuring they click securely into place. Reconnect your negative battery terminal.
- Final Step: In some cases, a security relearn procedure may be necessary, which can typically be done without special tools by cycling the key. Your vehicle’s service manual will have the specific steps if required.
Verified Vehicle Compatibility
This 2003-2006 Escalade PCM is a direct replacement for a wide array of GM trucks and SUVs. It is compatible with service numbers 89017750, 12582605, 12589463, 89017734, and 28042802. Please verify your part number or use our vehicle fitment tool to ensure compatibility. This module fits many popular models, including:
- Cadillac Escalade, ESV, EXT (2003-2006)
- Chevrolet Avalanche 1500 (2003-2006)
- Chevrolet Silverado 1500, 2500, 3500 (2003-2007 Classic)
- Chevrolet Suburban 1500, 2500 (2003-2006)
- Chevrolet Tahoe (2003-2006)
- GMC Sierra 1500, 2500, 3500 (2003-2007 Classic)
- GMC Yukon, Yukon XL 1500, Yukon XL 2500 (2003-2006)
- Hummer H2 (2003-2007)
- And more, including select Isuzu Ascender, Chevrolet SSR, Trailblazer EXT, and GMC Envoy XL models.
Frequently Asked Questions
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential. It allows us to access the exact factory calibration file for your specific vehicle, including engine size, transmission type, and emissions equipment. We program the module with this data and the latest GM software updates for a perfect match.
Is any additional programming required after installation?
No. This PCM arrives ready to install. Because it is pre-programmed to your VIN, you can avoid the expensive dealer programming. On some vehicles, a simple key-cycle security relearn may be needed, which does not require any special tools.
What is the difference between a PCM and an ECM?
The terms are often used interchangeably. ECM stands for Engine Control Module, while PCM means Powertrain Control Module. The PCM is a more inclusive term as it typically controls both the engine and the transmission functions, which is the case for this part.
How do I find my original part number?
The part number (or service number) is printed on a sticker on the case of your current PCM. Matching this number is a great way to confirm you are ordering the correct part. This module replaces several common service numbers.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM (like codes P0601 or P0606), then yes, this part is the correct fix. However, it’s always best to diagnose the code properly to ensure the fault isn’t with a sensor or wiring.