Restore Your Truck’s Brain and Get Back on the Road
Is your 2003-2007 Sierra 1500, Silverado, or other GM truck plagued by frustrating issues like a no-start condition, a persistent check engine light, or erratic shifting? The problem often points to a failing Powertrain Control Module (PCM), the central computer that manages your engine and transmission. When it falters, your entire vehicle’s performance suffers. This replacement PCM, part number 89017750, is the reliable, straightforward solution to restore your truck’s proper function and drivability.
We take the guesswork and extra cost out of the repair. Unlike a generic module from a parts store, this PCM arrives at your doorstep pre-programmed with the latest official GM software, specifically matched to your vehicle’s VIN. This means no expensive trips to the dealership for programming. It’s a direct-fit, plug-and-play solution designed to get you back in the driver’s seat with confidence.
Case Study: A Tricky Diagnosis
I remember a 2006 Silverado 2500 that came into my bay with a bizarre, intermittent no-crank, no-start issue. The owner had already replaced the battery, starter, and ignition switch. The truck would be fine for days, then suddenly refuse to start. No codes were stored initially. After hooking up my scan tool and monitoring live data, I noticed the PCM wasn’t always sending the ‘crank’ signal to the starter relay. On these GM trucks, corrosion on the PCM’s pins or internal circuit board failure due to heat cycles is a common culprit. We installed a VIN-programmed PCM, and the problem was solved instantly. It’s a classic example of how a failing 2003-2007 Sierra 1500 PCM can mimic other component failures, making accurate diagnosis key.
Is Your GM Truck Showing These Signs?
A failing PCM can cause a wide range of symptoms. If you’re experiencing any of the following, your engine computer is a likely suspect:
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- ✔ The engine will crank but refuses to start.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A sudden drop in fuel economy for no apparent reason.
- ✔ Stalling, rough idling, or engine misfires.
- ✔ Communication errors with your scan tool.
A Straightforward Guide to Installation
Replacing the 2003-2007 Sierra 1500 PCM is a job most DIYers can handle in their own driveway. Our VIN-programming service eliminates the most difficult step. Follow this general guide for a smooth installation:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
- Locate the PCM: On most compatible trucks and SUVs (like the Sierra, Silverado, and Tahoe), the PCM is located in the engine bay on the driver’s side, often under or next to the battery tray.
- Disconnect the Old Module: Carefully unplug the electrical connectors. These GM connectors have locking tabs that need to be released. Be gentle to avoid damaging the pins or wiring harness.
- Remove the Old PCM: Unbolt the module from its mounting bracket. Keep the hardware, as you may need it to install the new unit.
- Install the New PCM: Mount your new, pre-programmed PCM and securely reconnect the electrical harnesses. You should hear a ‘click’ as they lock into place.
- Reconnect the Battery: Reattach the negative battery terminal.
- Perform Security Relearn: Your vehicle’s anti-theft system (PassLock/PassKey) may need to be relearned to the new PCM. This is a simple procedure: turn the key to the ‘ON’ position for 10-15 minutes, then off for 10 seconds. Repeat this cycle 3 times, and the truck should then start.
Will This Fit My Truck?
This PCM is a direct replacement for service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. It fits a wide range of GM vehicles. Please verify your model and year below. The VIN-specific programming ensures it works correctly with your vehicle’s options.
Compatible Models Include (2003-2007):
- GMC Sierra 1500/2500/3500 & Denali
- Chevrolet Silverado 1500/2500/3500
- Chevrolet Avalanche, Suburban, Tahoe, SSR, Trailblazer EXT
- Cadillac Escalade, ESV, EXT
- GMC Yukon, Yukon XL, Envoy XL
- Hummer H2
- Isuzu Ascender
Note: This is a partial list. Please refer to the full compatibility chart or contact us with your VIN to confirm fitment.
Frequently Asked Questions
Why do I need to provide my VIN?
Your Vehicle Identification Number (VIN) allows us to program the PCM with the exact software and calibrations your specific truck needs. This includes engine size, transmission type, and other factory options, ensuring seamless, plug-and-play operation.
Is any additional programming required after installation?
No. The module arrives fully programmed to your vehicle. The only potential step is a simple ‘security relearn’ procedure, which takes about 30 minutes and requires no special tools. We include instructions for this process.
Where is the PCM located on my 2005 Sierra?
On most 2003-2007 GM trucks, including the Sierra, the PCM is found in the engine compartment on the driver’s side, mounted near the battery and firewall.
Will this fix my P0601 code?
Yes. The diagnostic trouble code P0601 (Internal Control Module Memory Check Sum Error) indicates an internal failure of the PCM itself. Replacing the module with this pre-programmed unit is the correct and definitive repair for this code.
What happens after I place my order?
After you purchase the PCM, you will need to send us your 17-digit VIN. We cannot ship the product until we receive it. Once we have your VIN, we will program the module and typically ship it within one business day.