Restore Peak Performance to Your GM Truck or SUV
Is your 2003-2006 GMC Yukon, Sierra, or other GM vehicle running rough, stalling unexpectedly, or showing a persistent Check Engine Light? These are classic signs of a failing Powertrain Control Module (PCM), the electronic brain of your engine. A faulty PCM can disrupt everything from fuel economy and transmission shifting to simple starting. Instead of facing a costly trip to the dealership for diagnostics and programming, you can get a reliable, direct-fit solution right here. This isn’t just a part; it’s a restoration of your vehicle’s core operational integrity.
We provide a professionally prepared 2003-2006 Yukon PCM that is flashed with the latest official GM software updates. The process is simple: after your purchase, you provide us with your vehicle’s 17-digit VIN. Our technicians then program the module specifically for your truck’s configuration, ensuring it works seamlessly with your existing systems right out of the box. This eliminates compatibility guesswork and the need for expensive dealer-only tools.
From the Diagnostic Bay: The Intermittent No-Start Mystery
A customer brought in his 2005 Sierra 1500 with a frustrating problem: it would randomly refuse to start. No crank, no click, nothing. Then, an hour later, it would fire right up. He’d already replaced the battery and checked the starter. In the shop, I noticed no communication with the PCM when the fault occurred. After checking the power and ground circuits to the module—which were solid—I suspected an internal PCM failure. These P59 controllers can develop micro-fractures on the circuit board from years of heat cycles and vibration. We installed one of our pre-programmed PCMs, performed the 30-minute security relearn, and the truck has started reliably ever since. It’s a common failure I’ve seen dozens of times on these otherwise bulletproof trucks.
Common Signs of a Failing PCM
If you’re experiencing any of the following, a faulty engine computer could be the culprit. A failing module can often trigger specific Diagnostic Trouble Codes (DTCs) that a standard OBD2 scanner can read.
- ✔ Check Engine Light is illuminated with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (PCM Processor Fault).
- ✔ The engine cranks but will not start.
- ✔ Unexplained drops in fuel efficiency.
- ✔ Harsh, erratic, or delayed automatic transmission shifting.
- ✔ Intermittent stalling or rough idling.
- ✔ Communication errors with other vehicle modules (U-codes).
A Straightforward Guide to Installation
Installing your new PCM is a manageable job for a DIY enthusiast. After the physical installation, a simple security relearn procedure is required to sync the new module with your vehicle’s anti-theft system. No special scan tools are needed for this process.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most compatible trucks and SUVs, the PCM is located on the driver’s side, in the engine bay, near or under the battery tray.
- Disconnect Connectors: Carefully unclip and remove the wiring harness connectors from the old PCM. These connectors have locking tabs that need to be released.
- Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New PCM: Mount your new, pre-programmed PCM and securely re-attach the wiring harness connectors. Ensure they click into place.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn: Turn the key to the “ON” position (do not start) for 10-12 minutes, or until the security light on the dash turns off. Turn the key “OFF” for 10 seconds. Repeat this cycle two more times (for a total of three cycles and about 30 minutes). The vehicle should now start and run normally.
Verified Vehicle Compatibility
This module is a direct replacement for service number 28042802 and is also compatible with 89017750, 12582605, 12589463, 12602802, and 89017734. It fits a wide range of GM vehicles. Please verify your model and options below.
Note: Specific engine sizes and option codes may apply. For some 2004 models, fitment is dependent on matching ID 12602802. For 2007 trucks, this fits the ‘Classic’ style with the creased door skin only.
Frequently Asked Questions
Frequently Asked Questions
Do I need to have this PCM programmed by a dealer?
No. We handle the programming for you before we ship. Just provide your vehicle’s VIN at checkout, and the module will arrive with the latest GM software, ready for installation and the security relearn procedure.
What is the security relearn procedure?
It’s a simple, 30-minute process that pairs the new PCM to your vehicle’s anti-theft system. It involves cycling the ignition key and does not require any special tools. We include detailed instructions with your order.
Where do I find my VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on a placard on the driver’s side of the dashboard, visible through the windshield.
Will this fix my transmission problems?
In many cases, yes. The PCM controls transmission shift points and line pressure. If your shifting issues are caused by faulty electronic commands from the PCM, this new module can resolve them. However, it will not fix internal mechanical issues within the transmission itself.
How do I know if this part number is correct?
This module, 28042802, replaces several common service numbers. You can check the sticker on your original PCM for a matching number, or simply confirm your vehicle is on our compatibility list. Programming to your VIN ensures it functions correctly regardless.