Restore Peak Performance to Your GM Truck
If you’re dealing with frustrating issues like a persistent check engine light, poor fuel economy, erratic shifting, or a no-start condition, a failing Powertrain Control Module (PCM) is often the culprit. As the brain of your vehicle’s engine, a faulty PCM can cause a cascade of problems that are difficult to diagnose. This replacement PCM, part number 89017750, is the reliable, straightforward solution to get your 2003-2007 Sierra Denali or other compatible GM vehicle running like new again. Forget expensive dealership visits and complex programming tools—we handle the critical programming for you before it even ships.
A Technician’s Notebook
I remember a 2006 Silverado 2500 with the 6.0L that came into my bay with a bizarre complaint: it would randomly stall at stoplights, but only when the A/C was on. No consistent codes, just an occasional U0100 (Lost Communication with ECM/PCM). After hours of chasing wires and checking grounds, we swapped in a known-good PCM. The problem vanished. The original module’s internal processor was failing under the specific load and heat conditions. This is a classic example of how a failing 2003-2007 Sierra Denali PCM can create phantom issues that seem unrelated to the engine itself. This pre-programmed unit would have been a 30-minute fix from the start.
Is Your Truck Showing These Telltale Signs?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs attention:
- âś” Unexplained Check Engine Light with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- âś” Vehicle refuses to start or has intermittent starting problems.
- âś” Noticeable decrease in fuel efficiency.
- âś” Harsh or delayed transmission shifting.
- âś” Engine stalling, stumbling, or misfiring for no apparent reason.
- âś” Communication errors with diagnostic scan tools.
Plug-and-Play Installation: Get Back on the Road Fast
Installing your new 2003-2007 Sierra Denali PCM is a simple process that most DIYers can complete with basic hand tools. Since we program it to your vehicle’s VIN, the most complex step is already done for you.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most of these GM trucks and SUVs, the module is located in the engine bay on the driver’s side, often under or next to the battery tray.
- Disconnect Connectors: Carefully unclip the wiring harness connectors. These usually have a lever or tab that needs to be released. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. Keep the hardware, as you may need it for the new installation.
- Install the New PCM: Mount your new, pre-programmed PCM and securely reconnect the wiring harnesses. You should hear a ‘click’ as they lock into place.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn: You will need to perform a simple security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. This allows your vehicle’s anti-theft system to recognize the new PCM.
Verified Vehicle Compatibility
This module is a direct replacement for service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. It is guaranteed to fit a wide range of GM trucks and SUVs, including many models of the Sierra, Silverado, Tahoe, Suburban, Escalade, Hummer H2, and more. Please see the detailed fitment list to confirm compatibility with your specific year, make, and model.
Why do you need my VIN?
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential. We use it to load the exact, factory-correct software and the latest GM updates for your truck’s specific engine, transmission, and options. This ensures perfect compatibility and function right out of the box, eliminating the need for a trip to the dealer for programming.
Is this a simple plug-and-play installation?
Yes, for the most part. Once we program the module, the physical installation is a direct swap. The only additional step is a simple security relearn procedure (also known as a CASE relearn) that you can do yourself in about 30 minutes with just your ignition key. We provide instructions for this process.
Will this fix my check engine light?
If your check engine light is caused by an internal failure of the PCM (like codes P0601 or P0606), then yes, this will resolve the issue. However, if the light is on due to a faulty sensor or other component elsewhere on the vehicle, you will still need to address that separate problem.
How do I find my original part number?
The part number is printed on a sticker on your original PCM. However, you don’t need to match it exactly. As long as your vehicle is on our compatibility list, we will program the correct software for you based on your VIN. This module replaces multiple service numbers.