Restore Peak Performance to Your GM Truck or SUV
Is your 2003-2007 Silverado 2500, Sierra, or other GM vehicle running rough, shifting erratically, or showing a persistent Check Engine Light? You’re not just dealing with an annoyance; you’re facing a failure of the vehicle’s central command center: the Powertrain Control Module (PCM). As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing PCM can cause a cascade of frustrating, hard-to-diagnose problems. This isn’t just a part; it’s the solution to getting your reliable workhorse back on the road with confidence.
This replacement PCM, part number 89017750, is the definitive fix for these issues. We take the guesswork and dealership hassle out of the equation. Before we ship, our experts will program the module with the latest GM software updates, specifically matched to your vehicle’s VIN. This means it arrives at your door ready for a straightforward installation, restoring the precise fuel delivery, ignition timing, and transmission control your truck had when it was new.
From the Diagnostic Bay: The Ghost in the Machine
I remember a 2006 Silverado 2500 that came into my shop with a laundry list of complaints. The owner had already replaced the throttle body and a few sensors, but it still had a rough idle, unpredictable stalling at stoplights, and harsh 1-2 shifts. The scanner showed intermittent communication loss codes (U0100) alongside a dreaded internal controller memory error (P0601). After verifying the wiring and grounds were solid, all signs pointed to the PCM. We installed a VIN-programmed module just like this one, and it was like a new truck. All symptoms vanished. It’s a classic case I’ve seen hundreds of times; don’t chase expensive parts until you’ve ruled out the brain.
Common Signs of a Failing PCM
- ✔ Check Engine Light is on with codes like P0601, P0606, or U-series communication codes.
- ✔ Your engine cranks but refuses to start.
- ✔ Noticeable decrease in fuel economy.
- ✔ The engine misfires, runs rough, or stalls unexpectedly.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass an emissions test due to module-related faults.
- ✔ Other modules on the vehicle (like the ABS or BCM) report a loss of communication with the PCM.
A Straightforward Guide to Installation
Replacing the PCM on these GM trucks is a job most DIYers can handle in under an hour. The key is a patient and methodical approach.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental reconnection.
- Locate the PCM: On most of these trucks and SUVs, you’ll find the PCM in the engine bay on the driver’s side, typically under or next to the battery tray, or near the air filter box.
- Disconnect the Wiring: The PCM has several large multi-pin connectors. Each has a locking tab or lever. Carefully release the locks and gently pull the connectors straight out. Never force them. Inspect the pins for any corrosion or damage.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. Keep the hardware safe as you will need it for the new module.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and secure it with the original hardware.
- Reconnect Everything: Firmly press the wiring harnesses back into the new PCM until they click into place, and engage the locking levers. Reconnect the negative battery terminal.
- Security Relearn Procedure: In many cases, you will need to perform a simple security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. This allows the vehicle’s anti-theft system to recognize the new PCM. Your vehicle’s service manual will have the exact steps.
Will This Fit My Truck or SUV?
We guarantee compatibility with the following vehicles and options. This module directly replaces service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802.
2003-2006 Avalanche, Suburban, Tahoe, Yukon/Yukon XL
2003-2007 Hummer H2
2003-2006 Cadillac Escalade, ESV, EXT
2003 Isuzu Ascender 5.3L
2003 Envoy XL / Trailblazer EXT 5.3L
2003 Chevrolet SSR
Please verify your specific year and engine options using the detailed fitment list or contact us with your VIN. For ’07 models, this fits the ‘Classic’ body style.
Frequently Asked Questions
Frequently Asked Questions
Do I need to have this programmed at a dealer?
No. The main benefit of our service is that we program the PCM to your vehicle’s specific VIN before we ship it. This saves you a trip to the dealership and additional programming fees.
What information do you need from me?
After you place your order, you must provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). We cannot ship the module without it.
Is any other setup required after installation?
In most cases, you will need to perform a security relearn procedure, which is a simple process of cycling the ignition key. Some vehicles may also require a Case Relearn (Crankshaft Position System Variation Learning) for optimal performance, which can be done with many high-end scan tools or by a professional mechanic.
Where is the VIN located?
You can find your VIN on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, and on your vehicle’s registration and insurance documents.
Will this fix my specific problem?
This PCM is a direct solution for failures within the module itself, which cause a wide range of symptoms. While it resolves the most common issues, always ensure a proper diagnosis has been performed to rule out other problems like bad sensors or wiring.
What does this part replace?
This part is a direct replacement for multiple GM service numbers, including 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802.