Is Your GM Truck or SUV Experiencing Engine or Transmission Problems?
If your Chevrolet Silverado, Tahoe, GMC Sierra, Yukon, or other compatible GM vehicle is suffering from issues like a persistent check engine light, erratic transmission shifting, stalling, or a no-start condition, a failing Powertrain Control Module (PCM) is often the culprit. The PCM is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to transmission shift points and emissions systems. When it fails, it can cause a cascade of frustrating and difficult-to-diagnose problems.
This replacement Powertrain Control Module, part number 89017750, is the definitive solution to restore your vehicle’s performance, reliability, and efficiency. It is a direct-fit replacement for a wide range of GM trucks and SUVs manufactured between 2003 and 2007 (classic models). To ensure a seamless installation, we program the module specifically to your vehicle using your VIN. This process installs the latest, most stable software updates from General Motors, often correcting factory flaws and improving overall drivability.
From the Diagnostic Bay
We had a 2005 Sierra 2500 with the 6.0L come in with a complaint of harsh, unpredictable shifting and what the owner described as ‘transmission slipping.’ He had already spent a significant amount of money at a transmission shop, which couldn’t find any mechanical faults. After scanning the vehicle, we found no specific transmission codes, but we did notice intermittent communication loss with the PCM. On these trucks, the PCM controls both the engine and the transmission. A failing driver circuit inside the module was sending bad signals to the transmission solenoids, causing all the shifting chaos. We installed a VIN-programmed PCM, performed the security relearn, and the truck drove like it just rolled off the assembly line. It’s a classic case where the root problem lies in the electronics, not the heavy-duty mechanical parts.
Common Symptoms of a Failing GM PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine stalling, stumbling, or misfiring.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
- ✔ Poor fuel economy and loss of engine power.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Inaccurate or non-functioning dashboard gauges.
- ✔ Failure to pass state emissions testing.
Why Choose Our Programmed 2003-2006 GM PCM?
Getting your vehicle back on the road shouldn’t be a complicated ordeal. Our process is designed to be as simple as possible. Unlike a generic module from a parts store or salvage yard, our units are prepared for your specific vehicle. When you provide your VIN during checkout, our technicians access the official GM database to flash the module with the correct calibration files. This ensures that all systems, from the engine and transmission to the anti-lock brakes and security system, communicate correctly. This is not a generic, one-size-fits-all solution; it’s a tailored fix for your truck.
This module is a direct replacement for multiple service numbers, including 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. The installation is straightforward: disconnect the battery, unplug the electrical connectors from your old PCM, unbolt it, and install the new one in its place. After reconnecting everything, you may need to perform a simple security relearn procedure, which can often be done without special tools. This ensures your vehicle starts and runs as it should, saving you a costly trip to the dealership.
Frequently Asked Questions
Do I need to have this PCM programmed by a dealer?
No. We handle all the programming for you before we ship the part. Simply provide us with your vehicle’s 17-digit VIN during or after checkout, and it will arrive ready for installation.
What is a VIN and where do I find it?
The VIN (Vehicle Identification Number) is a unique 17-digit code for your vehicle. You can typically find it on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Will I need to do anything after installing the module?
In most cases, you will need to perform a security relearn procedure, also known as a VATS relearn. This procedure pairs the new PCM with your vehicle’s anti-theft system. It’s a simple process that typically involves turning the key on and off in a specific sequence and can be done in your driveway. Instructions are readily available online for your specific model. A crankshaft variation relearn (CASE relearn) may also be needed with a scan tool to clear certain codes.
How can I be sure my PCM is the actual problem?
While the symptoms listed are very common for PCM failure, it’s always best to have a proper diagnosis performed by a qualified mechanic. Issues like bad grounds, faulty sensors, or wiring problems can sometimes mimic PCM failure. A thorough diagnosis can confirm the PCM is the root cause before you order a replacement.
Where is this part located on my vehicle?
On most GM trucks and SUVs from this era (like the Silverado, Sierra, Tahoe, and Suburban), the PCM is located in the engine bay on the driver’s side, often mounted near the battery or the air filter box.
Will this fix my harsh transmission shifting?
It very often does. The PCM controls the transmission’s hydraulic line pressure and shift solenoids. A failing module is a very common cause of shifting problems on these GM vehicles. Installing a correctly programmed module with the latest software updates can restore smooth and proper transmission function.