Restore Your Truck’s Brainpower and Performance
Is your 2003-2007 Silverado, Sierra, or other GM truck running rough, shifting poorly, or showing a stubborn Check Engine Light? The Powertrain Control Module (PCM) is the central computer of your vehicle, and when it starts to fail, it can cause a host of frustrating and hard-to-diagnose problems. This isn’t just a replacement part; it’s a reliable, long-term solution. We provide a professionally programmed PCM, part number 89017750, flashed with the latest GM factory software specifically for your truck’s Vehicle Identification Number (VIN). This ensures seamless communication between your engine and transmission, restoring the performance and reliability you depend on.
From the Diagnostic Bay: The Ghost in the Machine
I remember a 2005 Sierra 1500 that came into my shop with a problem that was driving the owner crazy. The truck would randomly hesitate, the transmission would slam into gear, and he had a persistent P0300 (Random Misfire) code that multiple shops couldn’t solve. They had replaced plugs, wires, and even a coil pack. After checking all the basics—fuel pressure, vacuum leaks—I hooked up my scope to the PCM connectors. The 5-volt reference signal, which powers many critical sensors, was fluctuating ever so slightly. It wasn’t enough to set a specific sensor code, but it was enough to corrupt the data the PCM was receiving. This is a classic sign of internal PCM failure, often caused by years of heat cycles and vibration. We installed a VIN-programmed PCM like this one, performed the security relearn, and the truck ran perfectly. The ‘ghost’ was gone. It’s a reminder that sometimes the root cause is the component that’s supposed to be doing all the thinking.
Is Your GM Truck Showing These Signs of a Bad PCM?
- ✔ Persistent Check Engine Light that won’t clear.
- ✔ Diagnostic Trouble Codes (DTCs) like P0601, P0606 (Internal Module Failure) or U-series communication codes.
- ✔ Engine stalling, stumbling, or refusing to start.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A sudden, unexplained drop in fuel economy.
- ✔ Failure to pass an emissions or smog test.
- ✔ Intermittent issues that seem to have no other cause.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- ✔ Locate the PCM: On most of these GM trucks and SUVs, the PCM is located in the engine bay on the driver’s side, often under or next to the battery tray in a plastic housing.
- ✔ Disconnect Connectors: Carefully release the locking tabs on the wiring harness connectors and pull them straight out from the module. There are typically two or three large connectors. Avoid damaging the pins.
- ✔ Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s usually held in by a few 10mm or 13mm bolts.
- ✔ Install the New PCM: Mount your new, pre-programmed PCM in place and securely fasten the bolts.
- ✔ Reconnect Everything: Plug the wiring harnesses back into the new module until they click into place. Reconnect your battery terminal.
- ✔ Perform Security Relearn: 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’ for 10 seconds, and repeating this cycle three times. This allows the new PCM to sync with your vehicle’s anti-theft system. Your truck will not start until this is completed.
Verified Vehicle Compatibility
This module, service number 89017750, is a direct replacement for a wide range of GM vehicles. It is also compatible with service numbers 12582605, 12589463, 12602802, 89017734, and 28042802. Please confirm your vehicle is on the list below. For some models, matching the ID number is critical.
Fits various 2003-2007 models including: Chevrolet Silverado 1500/2500/3500, Avalanche 1500, Suburban, Tahoe, SSR; GMC Sierra 1500/2500/3500, Sierra Denali, Yukon, Yukon XL; Cadillac Escalade, ESV, EXT; Hummer H2; Isuzu Ascender; and Buick Rainier, among others. Please use the fitment tool or contact us with your VIN to guarantee compatibility.
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential. It allows us to flash the PCM with the exact, correct software calibration from GM for your truck’s specific engine, transmission, and options. This ensures it works perfectly right out of the box.
Is this a simple plug-and-play installation?
Almost. The module is pre-programmed, so you don’t need a special scan tool. However, after installing it, you must perform a security relearn procedure, also known as a Passlock or VATS relearn. It’s a simple process that takes about 30 minutes and only requires your ignition key. We include instructions for this.
Will this fix my specific problem?
A failing PCM can cause a wide range of symptoms. While this part is a common solution for issues like no-start, poor running, and specific internal module error codes (like P0601), we always recommend a proper diagnosis by a qualified mechanic to confirm the PCM is the point of failure before ordering.
What if I have a 4.3L V6 engine?
Please note the fitment details. This specific PCM is generally not compatible with models equipped with the 4.3L V6 engine. Please verify your engine size before ordering.
What does the service number on my old PCM mean?
The service number is the original part number from the factory. Over the years, GM often consolidates and provides software updates under new service numbers. This part (89017750) is a valid replacement for all the service numbers listed in the description.