Restore Peak Performance to Your GM Truck or SUV
Is your Silverado, Sierra, Tahoe, or Yukon suffering from perplexing issues like poor fuel economy, erratic shifting, or a persistent check engine light? The Powertrain Control Module (PCM), the central computer of your vehicle, is often the culprit. This vital component manages everything from fuel injection and spark timing to transmission shift points and emissions controls. When it begins to fail, it can cause a cascade of problems that are frustrating and difficult to diagnose. This replacement PCM, part number 89017734, is the definitive solution to restore your vehicle’s factory performance and reliability.
We take the guesswork and complexity out of the replacement process. Unlike a generic module from a parts store, each unit we ship is meticulously programmed to your vehicle’s specific Vehicle Identification Number (VIN). This ensures complete compatibility with your engine, transmission, and all factory-installed options. We load the latest, most stable software updates directly from GM, which can resolve underlying drivability issues you may not have even known were software-related. This is a true plug-and-play solution designed to get you back on the road quickly and confidently.
Diagnosing Your 2003-2007 GM PCM
A failing PCM can manifest in numerous ways, often mimicking other sensor or component failures. If you’ve been chasing electrical gremlins or replacing parts without success, it’s time to consider the vehicle’s brain. A faulty module can disrupt communication between critical systems, leading to unpredictable behavior and poor performance.
From the Diagnostic Bay
We had a 2005 Sierra 2500 with the 6.0L come in that was driving the owner crazy. The truck would randomly stall at idle, the transmission would slam into gear intermittently, and it threw a mix of communication and sensor codes that made no sense together. The owner had already replaced the throttle body and a few sensors. After hours of checking wiring harnesses and grounds, we hooked up our high-level scanner and monitored the PCM’s data stream. We noticed the processor would occasionally drop data packets and show erratic voltage readings internally. We swapped in one of our VIN-programmed PCMs, performed the security relearn, and the truck ran perfectly. All the phantom codes vanished, and the shifting smoothed out immediately. It was a classic case of a failing PCM causing widespread, ghost-like issues.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light: The light is on, and you may have codes related to PCM internal failure (like P0601, P0606) or multiple, unrelated system codes.
- ✔ Engine Performance Issues: Stalling, rough idling, misfiring, hesitation during acceleration, or a noticeable loss of power.
- ✔ Poor Fuel Economy: A sudden and unexplained drop in your vehicle’s gas mileage.
- ✔ Transmission Problems: Harsh shifting, delayed engagement into gear, or getting stuck in one gear (limp mode).
- ✔ No-Start Condition: The engine cranks but refuses to start, even with a good battery and starter.
- ✔ Failed Emissions Test: Inability to pass smog inspections due to PCM-related fault codes.
- ✔ Intermittent Electrical Problems: Gauges acting erratically or other electronic components malfunctioning without a clear cause.
The Importance of VIN Programming
Ordering this module is simple. After your purchase, you will provide us with your vehicle’s 17-digit VIN. Our technicians use this number to access the official GM database and download the exact software calibration file for your truck. This process ensures that the PCM recognizes your security system (VATS/Passlock), controls your specific transmission type correctly, and manages all the unique features of your trim level. Without this critical step, a replacement module simply will not function. We handle this for you, so when the part arrives, it’s ready for installation.
This module is a direct replacement for multiple service numbers, including: 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. Please verify your part number or contact us to confirm compatibility.
Frequently Asked Questions
Do I need to do any programming after I receive the PCM?
No! We program the unit to your vehicle’s VIN before shipping. However, you will need to perform a security relearn procedure after installation, which can typically be done without special tools. This procedure syncs the new PCM with your vehicle’s anti-theft system. Instructions are readily available online for your specific model. A Crankshaft Variation Relearn (CASE Relearn) may also be required, which is best done with a capable scan tool.
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 metal plate on the driver’s side of the dashboard, visible through the windshield.
Is this a difficult part to install?
For someone with basic mechanical skills, the installation is straightforward. The PCM is typically located in the engine bay, often on the driver’s side near the battery or airbox. The process involves disconnecting the battery, unplugging the electrical connectors, unbolting the old module, and then reversing the process to install the new one.
Will this fix my check engine light?
If the check engine light and associated symptoms are caused by a faulty PCM, this replacement part is the correct solution. It’s crucial to ensure that the underlying issue is not a separate failed sensor or wiring problem. This module resolves issues originating from the computer itself.
What if I have modifications on my vehicle?
This PCM is programmed with the latest factory GM software for a stock vehicle configuration. It is not designed for vehicles with significant aftermarket modifications that alter engine or transmission parameters.