Is Your GM Truck or SUV Acting Up?
If you’re dealing with frustrating issues like stalling at stoplights, erratic shifting, a persistent check engine light, or a vehicle that simply won’t start, the problem often points directly to a failing Powertrain Control Module (PCM). As the brain of your engine and transmission, when the PCM starts to fail, it can cause a cascade of confusing and costly problems. I’ve seen it hundreds of times in my 20+ years on the shop floor: a perfectly good engine held hostage by a faulty computer.
The Direct-Fit, No-Hassle Solution
This is a replacement PCM, service number 89017750, designed as a direct-fit solution for a wide range of 2003-2007 GM trucks and SUVs, including the Silverado, Sierra, Tahoe, and Avalanche. The biggest headache with replacing a PCM is the programming—typically requiring a tow to the dealership and expensive labor fees. We eliminate that step entirely. Simply provide us with your vehicle’s VIN during checkout, and our technicians will program the module with the latest official GM software specific to your truck. It arrives at your door ready for a simple, plug-and-play installation.
Expert Pro Tip: Before installing your new PCM, take a moment to inspect and clean the harness connectors. Over the years, I’ve seen countless modules get condemned when the real issue was a corroded or bent pin on the vehicle’s harness. Use a small nylon brush and a quality electrical contact cleaner to ensure a perfect connection. This simple five-minute check can prevent intermittent issues and save you a major headache down the road.
Common Symptoms of a Failing PCM:
- ✔ Check Engine Light with communication error codes (like P0601, P0606).
- ✔ Engine stalling or cutting out unexpectedly.
- ✔ Harsh or incorrect transmission shifting.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
- ✔ Poor fuel economy and reduced engine power.
- ✔ Issues with other modules, like the instrument cluster acting erratically.
Solving Problems with a Programmed 2003-2006 Avalanche PCM
A customer’s 2005 Silverado 1500 came into my shop last month with a classic no-start condition. It had spark and fuel pressure, but the injectors weren’t getting a pulse signal from the computer. The scanner couldn’t even communicate with the factory PCM. After verifying the module had proper power and ground, the diagnosis was clear: a dead PCM. We installed one of our pre-programmed modules, and the truck fired right up on the first try. This is the reliable, straightforward fix you need to restore your vehicle’s operation and dependability.
Plug-and-Play Installation: No Dealer Visit Required
You can get your truck back on the road in under an hour with basic hand tools. Follow these simple steps:
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most of these trucks (like the Avalanche, Silverado, Sierra), it’s located in the engine bay on the driver’s side, under or near the battery tray.
- Disconnect Harnesses: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module.
- Remove Old Module: Unbolt the old PCM from its mounting bracket.
- Install New Module: Mount your new, pre-programmed PCM and securely reconnect the electrical harnesses. You should hear a ‘click’ as they lock into place.
- Reconnect Battery: Reattach the negative battery terminal. Your vehicle is now ready to start.
This module is a direct replacement for service numbers: 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. Please verify your part number and use our detailed fitment list to ensure compatibility. Don’t let a bad computer keep your truck sidelined. Order today and get a reliable, programmed solution delivered to your door.