Restore Peak Performance to Your GM Truck or SUV
Is your 2003-2006 Yukon XL 1500, or another compatible GM vehicle, suffering from baffling electrical issues? A faulty Powertrain Control Module (PCM) is often the culprit behind problems like poor fuel economy, erratic shifting, a persistent check engine light, or even a no-start condition. As the central computer for your engine and transmission, its health is critical. This replacement PCM, part number 12602802, is the definitive solution to get your truck back to factory-spec reliability and performance.
We take the guesswork and expensive dealership visits out of the equation. Unlike a generic part off the shelf, this Yukon XL 1500 PCM is professionally flashed with the latest official GM software updates specifically for your vehicle. Simply provide us with your Vehicle Identification Number (VIN) after purchase, and we’ll program the module before it ships. This ensures seamless integration and optimal function right out of the box, saving you hundreds in programming fees.
A Technician’s Notebook
I once had a 2005 Tahoe in the bay that would randomly stall at traffic lights and occasionally refuse to start. The owner had already replaced the battery, alternator, and crank sensor with no luck. There were no hard codes, just intermittent communication loss codes (U-series) when it acted up. After checking the main power and ground circuits to the PCM, I knew where the problem was. Heat soak was causing an internal failure in the module. We installed a VIN-programmed PCM just like this one, performed the quick security relearn, and the truck ran flawlessly. It’s a classic failure on these platforms, and this is the right fix.
Is Your GM Truck Exhibiting These PCM Failure Signs?
A failing computer can manifest in many ways. If you’re experiencing any of the following, a faulty PCM is a likely cause. This module is the direct solution for these common issues:
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (PCM Processor Fault).
- ✔ Vehicle refuses to start or has intermittent starting problems.
- ✔ Poor or declining fuel mileage.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine stalling, stumbling, or running rough for no apparent reason.
- ✔ Loss of communication with the diagnostic scan tool.
A Straightforward Guide to Installation
Installing your new Yukon XL 1500 PCM is a job most DIYers can handle in under an hour with basic hand tools. Follow these steps for a successful replacement.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most compatible models like the Yukon, Tahoe, and Silverado, the PCM is located in the engine bay on the driver’s side, typically under or next to the battery tray.
- Disconnect the Harnesses: The PCM has several large multi-pin connectors. Carefully lift the locking levers or tabs on each connector and gently pull them straight out from the module. Never force them.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. Keep the hardware, as you may need it to install the new unit.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and secure it. Reconnect the wiring harnesses, ensuring they click securely into place and the locking levers are fully seated.
- Reconnect the Battery: Re-attach the negative battery terminal.
- Perform Security Relearn (CRITICAL): You must perform a security relearn procedure, also known as a Passlock or VATS relearn. This simple process syncs the new PCM with your vehicle’s anti-theft system. The most common method is the “10-Minute Relearn”: Turn the key to the ‘ON’ position (don’t start the engine), wait about 10 minutes until the security light on the dash turns off or stops flashing, turn the key ‘OFF’ for 10 seconds, and repeat two more times. After the third cycle, the vehicle should start.
Verified Vehicle Compatibility
This module is a direct replacement for service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. It fits a wide range of GM trucks and SUVs. Please verify your vehicle is on this list. Note that some 2007 models are the ‘Classic’ body style.
- Avalanche 1500: 2003-2006
- Cadillac Escalade, ESV, EXT: 2003-2006
- Chevrolet SSR: 2003
- Chevrolet Silverado 1500, 2500, 3500: 2003-2007 (Classic)
- Chevrolet Suburban 1500, 2500: 2003-2006
- Chevrolet Tahoe: 2003-2006
- GMC Envoy XL / Chevrolet Trailblazer EXT (5.3L): 2003
- GMC Sierra 1500, 2500, 3500: 2003-2007 (Classic)
- GMC Sierra Denali: 2003-2007 (Classic)
- GMC Yukon & Yukon XL 1500: 2003-2006
- GMC Yukon XL 2500: 2003-2006
- Hummer H2: 2003-2007
- Isuzu Ascender (5.3L): 2003
Frequently Asked Questions About Your New PCM
Why do you need my VIN?
Why do you need my VIN?
Your VIN is essential because it allows us to program the PCM with the exact software calibration and updates GM specifies for your truck’s engine, transmission, and options. This ensures perfect compatibility and performance, eliminating the need for a dealer visit.
Is this a simple plug-and-play installation?
Why do you need my VIN?
Your VIN is essential because it allows us to program the PCM with the exact software calibration and updates GM specifies for your truck’s engine, transmission, and options. This ensures perfect compatibility and performance, eliminating the need for a dealer visit.
Will this fix my check engine light?
Why do you need my VIN?
Your VIN is essential because it allows us to program the PCM with the exact software calibration and updates GM specifies for your truck’s engine, transmission, and options. This ensures perfect compatibility and performance, eliminating the need for a dealer visit.
How do I find my current PCM’s service number?
Why do you need my VIN?
Your VIN is essential because it allows us to program the PCM with the exact software calibration and updates GM specifies for your truck’s engine, transmission, and options. This ensures perfect compatibility and performance, eliminating the need for a dealer visit.