Is Your GM Truck or SUV Running Rough? The PCM Might Be the Culprit.
The Powertrain Control Module (PCM) is the electronic brain of your vehicle, managing everything from fuel injection and ignition timing to transmission shift points and emissions controls. When it begins to fail, it can cause a cascade of confusing and frustrating problems that can be difficult to diagnose. You might experience a sudden drop in fuel economy, erratic shifting, a persistent check engine light, or even a no-start condition that leaves you stranded. Don’t let a faulty computer dictate your vehicle’s reliability. This direct-fit replacement PCM, part number 89017734, is the definitive solution to restore your vehicle’s performance and peace of mind.
From the Diagnostic Bay
We had a 2005 Silverado 2500HD with the 6.0L come into the shop with a complaint of harsh, erratic shifting and a check engine light for a transmission solenoid code. The owner had already replaced the solenoid pack and the transmission fluid, but the problem persisted. After hours of chasing wires and checking pressures, we hooked up our advanced scanner and monitored the data stream from the PCM. We noticed the command signals to the transmission were dropping out intermittently. The transmission was fine; the computer telling it what to do was failing. We installed a VIN-programmed PCM, and the truck shifted like it just rolled off the assembly line. It’s a classic case where the root cause is electronic, not mechanical.
Diagnosing a Failing GM PCM 89017734
A failing PCM can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following symptoms, it’s a strong indication that your powertrain control module needs attention. Replacing it with our pre-programmed unit can save you from costly and unnecessary repairs on other parts.
- ✔ Check Engine Light: The most common symptom, often with communication-related error codes (U-codes) or multiple, seemingly unrelated sensor codes.
- ✔ Poor Engine Performance: Noticeable loss of power, hesitation during acceleration, engine stumbling, or random misfires.
- ✔ Erratic Transmission Shifting: Harsh shifts, delayed engagement into gear, or getting stuck in one gear (limp mode).
- ✔ Reduced Fuel Economy: A sudden and unexplained decrease in your vehicle’s MPG is often a sign the PCM is not managing the fuel mixture correctly.
- ✔ Intermittent Stalling: The engine may stall for no apparent reason, either while driving or at idle.
- ✔ No-Start Condition: In severe cases, the PCM can fail completely, preventing the engine from starting at all, even though the battery and starter are good.
The Plug-and-Play Solution
What sets this module apart is our professional programming service. When you purchase this GM PCM 89017734, you’re not just getting a part; you’re getting a complete, ready-to-install solution. Simply provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN) during checkout. Our technicians will then flash the module with the latest, most stable software release from General Motors specific to your vehicle’s configuration. This critical step ensures perfect compatibility and optimal performance, eliminating the need for an expensive trip to the dealership for programming.
This unit is a direct replacement for multiple service numbers, including 89017750, 12582605, 12589463, 12602802, and 28042802. By consolidating these parts into one programmed module, we ensure you get the right component for a wide range of GM trucks and SUVs from 2003 to 2007, including the Hummer H2, Chevrolet Silverado, GMC Sierra, Tahoe, Yukon, and Cadillac Escalade.
Frequently Asked Questions
Is this PCM ready to install when I receive it?
Yes! This module is fully programmed to your vehicle’s VIN before it ships. In most cases, it is a plug-and-play installation. Some vehicles may require a security relearn procedure, which is a simple process that can be done without any special tools.
Where do I provide my VIN?
You can provide your 17-digit VIN in the notes section during checkout or reply to your order confirmation email. We cannot ship your part until we have this information to program it correctly.
What if my original part number is not 89017734?
That’s okay. This module replaces several service numbers, including 89017750, 12582605, 12589463, and 12602802. As long as your vehicle is on the compatibility list, this programmed module will function correctly.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM, then yes, this will resolve the issue. It’s crucial to ensure you have properly diagnosed the problem. This module will correct issues related to internal computer faults, but not issues from faulty external sensors or wiring.
Do I need to send my old PCM (core) back?
No core charge or return is required for this part. You can keep or responsibly dispose of your old module.