Restore Peak Performance to Your GM Truck or SUV
If you’re dealing with frustrating engine problems like a no-start condition, erratic performance, poor fuel economy, or a persistent Check Engine Light, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer for your engine and transmission, its proper function is critical. This replacement PCM, service number 89017750, is the reliable, straightforward solution to get your vehicle back on the road and running as it should. Forget expensive dealership visits for programming—we handle that for you.
We take the guesswork out of the repair. Before we ship your part, we will flash it with the latest official GM software updates, specifically programmed to your vehicle’s unique Vehicle Identification Number (VIN). This ensures seamless integration and communication with your vehicle’s other electronic systems. This isn’t just a replacement; it’s a restoration of your vehicle’s original operating parameters, providing a stable and dependable fix for a wide range of issues tied to the original 2003 Isuzu Ascender PCM and other compatible GM models.
From the Diagnostic Bay: The Case of the Intermittent Silverado
A customer brought in a 2004 Silverado 1500 with a problem that was driving him crazy: it would randomly fail to start. No crank, no click, nothing. Other times, it would run perfectly. He’d already replaced the battery and starter. After connecting my scan tool, I found several U-codes (communication loss) and a P0601 (Internal Control Module Memory Check Sum Error). These codes pointed directly to an internal failure of the PCM. The intermittent nature was caused by temperature changes affecting a failing processor on the circuit board. Swapping in a VIN-programmed PCM like this one resolved all communication errors and the no-start condition immediately. It’s a classic failure mode I’ve seen dozens of times on these GM platforms.
Is Your Truck or SUV Showing These Symptoms?
A faulty PCM can manifest in numerous ways. If you’re experiencing any of the following, this module is the likely solution:
- âś” Unexplained Check Engine Light
- âś” Engine cranks but will not start
- âś” Intermittent stalling or rough idling
- âś” Noticeable decrease in fuel efficiency
- âś” Harsh or incorrect automatic transmission shifting
- âś” Communication error codes, such as U0100 (Lost Communication with ECM/PCM)
- âś” Internal module failure codes, like P0601, P0602, or P0606
A Straightforward Guide to Installation
Installing your new 2003 Isuzu Ascender PCM is a manageable job for a DIY enthusiast. Since we program it beforehand, no special tools are needed for software setup.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10-15 minutes to allow all capacitors to discharge.
- Locate the PCM: On most compatible models, the PCM is found in the engine bay, on the driver’s side, either under the battery tray or next to the air filter box.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old PCM. These connectors have locking tabs that must be released before pulling. Avoid forcing them.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware, as you may need it for the new module.
- Install the New PCM: Mount the new module securely in the bracket and re-attach the wiring harness connectors. Ensure they click firmly into place.
- Reconnect Battery: Re-attach the negative battery terminal.
- Security Relearn (If Necessary): In some cases, your vehicle may require 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 before starting the engine. Consult your vehicle’s service manual for the specific procedure.
Verified Vehicle Compatibility
This module is a direct replacement for service number 89017750 and is also compatible with part numbers 12582605, 12589463, 12602802, 89017734, and 28042802. It fits a vast range of GM trucks and SUVs, including:
- Cadillac: Escalade, Escalade ESV, Escalade EXT (2003-2006)
- Chevrolet: Avalanche 1500 (2003-2006), Silverado 1500/2500/3500 (2003-2007 Classic), SSR (2003), Suburban 1500/2500 (2003-2006), Tahoe (2003-2006), Trailblazer EXT (2003)
- GMC: Envoy XL (2003), Sierra 1500/2500/3500 (2003-2007 Classic), Sierra Denali (2003-2007 Classic), Yukon (2003-2006), Yukon XL 1500/2500 (2003-2006)
- Hummer: H2 (2003-2007)
- Isuzu: Ascender (2003, with 5.3L V8)
Please verify your part number and check the detailed fitment list to ensure compatibility. If your vehicle is a 2004 or newer model and requires a specific ID (e.g., 12602802), this module is a correct replacement.
Frequently Asked Questions
Do I need to do any programming after I receive this PCM?
No. We program the module to your specific VIN before shipping. In most cases, it is a direct plug-and-play installation, though some vehicles may require a simple security relearn procedure that does not require special tools.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit VIN. You can typically add it as a note during checkout or send it to us in a message referencing your order number.
What happens if I don’t provide my VIN?
We cannot ship the module until we receive your VIN, as the programming is essential for the part to function correctly in your vehicle. This step prevents compatibility issues and ensures a successful repair.
Is this the same as an ECM?
Yes. The terms Powertrain Control Module (PCM) and Engine Control Module (ECM) are often used interchangeably for this component. It is the main computer that controls engine functions.
Will this fix my specific problem?
This module is a direct solution for failures internal to the PCM itself (e.g., code P0601). While it resolves a wide range of symptoms, it’s always best to perform a thorough diagnosis to rule out other issues like bad sensors, wiring problems, or fuel delivery issues.
Where is the part number located on my old module?
The service number is printed on a sticker on the case of your original PCM. Matching this number to 89017750 or one of the compatible service numbers is the best way to confirm you’re ordering the correct part.