Is Your Avalanche, Sierra, or Tahoe Acting Up?
If you’re dealing with frustrating issues like intermittent stalling, harsh shifting, a no-start condition, or a dashboard lit up with random warning lights, the problem is often the brain of your truck: the Powertrain Control Module (PCM). As a mechanic with over two decades of experience under the hood of these GM trucks, I’ve seen firsthand how a failing PCM can mimic a dozen other problems, leading to wasted time and money on parts you don’t need. This isn’t just a part; it’s the solution to getting your reliable truck back.
The Simple, Reliable Fix: VIN-Programmed and Ready to Install
Forget about expensive dealership visits and the hassle of towing your vehicle. We provide a professionally prepared PCM, part number 89017734, that arrives at your door ready for installation. We take your vehicle’s unique VIN and flash the module with the latest, most stable software updates directly from GM. This ensures perfect compatibility and optimal performance, addressing common factory software bugs that may have existed for years.
Common Symptoms of a Failing GM PCM:
- โ No-start or extended cranking times
- โ Check Engine Light (CEL) with communication error codes (U-codes)
- โ Poor fuel economy and engine performance
- โ Harsh or erratic automatic transmission shifting
- โ Apparent fuel pump or ignition system failure
- โ Stalling for no reason, either at idle or while driving
From the Shop Floor: A Real-World Diagnosis
A customer’s 2005 Sierra 1500 came in on a tow truck last month with a classic no-start. He had already replaced the fuel pump, thinking that was the obvious culprit. When we hooked up our scanner, we found no communication with the PCM. Before condemning the module, we checked the basics: power and ground pins at the PCM connector. They were perfect. The issue was internal to the original PCM; it was no longer sending the signal to energize the fuel pump relay. A new, programmed PCM like this one had him back on the road in under 30 minutes. It’s a textbook case I’ve seen hundreds of times on these GMT800 platform trucks.
Guaranteed Compatibility for Your 2003-2006 Avalanche 1500 PCM
This module is a direct replacement for a wide range of popular GM trucks and SUVs. It is fully compatible with service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. Please verify your vehicle in the fitment list to ensure a perfect match. The process is simple: after your purchase, provide us with your VIN, and we handle the rest.
Plug-and-Play Installation: No Dealer Visit Required
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most of these trucks (like the Avalanche, Silverado, Tahoe), it’s located under the hood on the driver’s side, near the battery, inside a black plastic bracket.
- Disconnect the Old Unit: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Then, unbolt the module from its mounting bracket.
- Install the New PCM: Mount your new, pre-programmed PCM and securely reconnect the wiring harnesses. You’ll hear a ‘click’ when they’re seated.
- Final Steps: Reconnect the negative battery terminal. In most cases, the vehicle will start and run perfectly. A security relearn procedure may be required, which takes about 30 minutes and can be done without any special tools.
Order today and restore the performance and reliability of your GM truck with a solution you can trust, backed by years of hands-on expertise.