Is your Isuzu Ascender or GM truck suffering from frustrating engine problems? Stalling, rough idling, poor fuel economy, or a persistent Check Engine Light can often be traced back to a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM is responsible for managing everything from fuel injection and spark timing to transmission shifting. When it fails, the entire system’s performance is compromised. This replacement Powertrain Control Module, part number 89017750, is the definitive solution to restore your vehicle’s original performance and reliability.
This isn’t just a generic, off-the-shelf part. We provide a fully programmed module tailored specifically to your vehicle. After your purchase, simply provide us with your Vehicle Identification Number (VIN), and our technicians will flash the unit with the latest, most stable software updates directly from GM. This critical step ensures seamless communication between the module and all other systems in your vehicle, eliminating the need for an expensive trip to the dealership for programming. It’s a true plug-and-play solution designed to get you back on the road quickly and confidently.
From the Diagnostic Bay
We had a 2005 Silverado 2500 come into the shop with a classic complaint: intermittent stalling at stoplights and a P0601 ‘Internal Control Module Memory Check Sum Error’ code. The owner had already replaced the throttle body and a couple of sensors, chasing the problem with no luck. We suspected the PCM right away. After confirming power and ground to the module were good, we installed one of our VIN-programmed units. The truck fired up instantly, idled smoothly, and the code was gone for good. It’s a perfect example of how correctly diagnosing the ‘brain’ first can save hundreds of dollars in unnecessary parts and labor.
Symptoms of a Failing 2003 Isuzu Ascender PCM
A faulty PCM can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following, your engine computer may be the culprit:
- ✔ Check Engine Light is illuminated with various trouble codes, especially those related to internal module failure (e.g., P0601, P0606).
- ✔ Unexplained drops in fuel efficiency.
- ✔ The engine cranks but refuses to start.
- ✔ Rough or erratic idling and stalling.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Misfire codes that persist even after replacing spark plugs, coils, and injectors.
Why Choose a VIN-Programmed Module?
Modern vehicles are complex networks of computers. The PCM must have the correct software not only for your specific engine and transmission but also for the options your vehicle was built with, such as tire size, gear ratio, and security system (Passlock/VATS). Our programming service ensures all these parameters are correctly set using your VIN. This guarantees that your new 2003 Isuzu Ascender PCM integrates perfectly, just like the original unit from the factory, but with the benefit of the latest software improvements for optimal performance and longevity.
This module is a direct replacement for service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. It fits a wide range of popular GM trucks and SUVs from 2003 to 2007, including the Chevrolet Silverado, Tahoe, Suburban, Avalanche, GMC Sierra, Yukon, Cadillac Escalade, and Hummer H2. Please verify the fitment list to ensure compatibility with your exact model and year.
Frequently Asked Questions
Do I need to get this PCM programmed by a dealer?
No. This PCM comes fully programmed to your vehicle’s specific VIN before we ship it. It is ready for installation right out of the box, saving you time and the high cost of dealership programming.
What is a CASE relearn and will I need to perform one?
A CASE (Crankshaft Angle Sensor Error) relearn is a procedure that synchronizes the new PCM with your engine’s crankshaft position sensor. In many cases, it is not required. However, if you have a persistent P1336 trouble code after installation, a CASE relearn will be necessary. This can be done by most professional repair shops with a capable bi-directional scan tool.
Where is the PCM located on my vehicle?
On most compatible GM trucks and SUVs like the Silverado, Sierra, and Tahoe, the PCM is located in the engine bay on the driver’s side, under or next to the battery tray. On models like the Isuzu Ascender or Trailblazer, it is often found next to the air filter box.
How do I provide my VIN for programming?
After you complete your purchase, you will receive instructions on how to send us your 17-digit VIN. You can typically add it as a note during checkout or reply to your order confirmation email. We cannot ship your part until we receive your VIN.
Is this a brand new part?
This is a genuine, original equipment part that has undergone a rigorous inspection and testing process to ensure it meets or exceeds all factory specifications. It is then loaded with the latest GM software for your vehicle.