Is Your Sierra Denali Running Rough? Get a Reliable Fix.
If you’re dealing with frustrating issues like a persistent Check Engine Light, erratic engine behavior, stalling, or poor fuel mileage in your 2003-2007 GM truck or SUV, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer for your engine and transmission, its health is critical. This isn’t just a replacement part; it’s a complete, ready-to-install solution designed to restore your vehicle’s performance and reliability.
We take the guesswork and hassle out of the repair. Unlike a generic module from a parts store, this PCM comes professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN). We load the latest, most stable software updates directly from GM, ensuring optimal communication between all your vehicle’s systems. This means no expensive trips to the dealership for programmingโa savings of both time and money.
From the Shop Floor: A Real-World Diagnosis
“A customer’s 2005 Sierra Denali came in last week with these exact symptoms: intermittent stalling at stop lights and a random P0300 misfire code that mechanics kept chasing by replacing spark plugs and coils. After confirming the fuel pressure and ignition system were healthy, we hooked up our scope to the injector command signals from the PCM. We found the signal would drop out randomly on multiple cylinders just before a stall. A new, properly programmed PCM fixed it instantly. Itโs a common failure Iโve seen dozens of times; the internal drivers weaken over time from heat and vibration.”
Why Choose This Programmed PCM?
- โ VIN-Programmed for Your Truck: Arrives flashed with the latest GM software specific to your vehicle. Just provide your VIN after purchase.
- โ Eliminates Common Failures: Solves issues like random stalling, no-start conditions, harsh shifting, and false sensor codes.
- โ No Dealer Visit Needed: This is a true plug-and-play module. The security and operating systems are pre-configured, saving you hundreds in dealer fees.
- โ Direct-Fit Replacement: Guaranteed to replace original service numbers including 89017750, 12582605, 12589463, and more.
- โ Restores Factory Performance: Corrects fuel trim, ignition timing, and transmission shift points for a smoother, more efficient ride.
Easy Installation for Your 2003-2007 Sierra Denali PCM
You can get your truck back on the road in under an hour with basic hand tools. Follow these simple steps for a successful installation.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: On most compatible trucks and SUVs (like the Sierra, Silverado, Tahoe, and Yukon), the PCM is located in the engine bay on the driver’s side, near the battery and under a plastic cover.
- Disconnect the Harnesses: Carefully lift the locking tabs on the electrical connectors and pull them straight out from the module. Never force them. Inspect the connectors for any corrosion or bent pins.
- Remove the Old Module: Unbolt the mounting bracket holding the PCM in place and remove the old unit from the vehicle.
- Install the New PCM: Mount your new, pre-programmed PCM, reconnect the electrical harnesses until they click securely in place, and re-install any covers.
- Reconnect and Start: Reconnect the negative battery terminal. The vehicle may require a security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes. Your vehicle is now ready to start.
Guaranteed Compatibility
This module is a direct replacement for a wide range of GM vehicles. It is crucial to match your vehicle’s year, make, model, and engine size. This unit replaces part numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. It fits many popular models including the Cadillac Escalade, Chevy Avalanche, Silverado, Suburban, Tahoe, GMC Sierra, Yukon, Hummer H2, and more from 2003 to 2007. Please verify fitment using the compatibility chart.