Restore Peak Performance to Your GM Truck or SUV
Is your 2003 Isuzu Ascender or another GM vehicle acting up? Dealing with a persistent Check Engine light, erratic shifting, or a frustrating no-start condition can bring your day to a halt. The Powertrain Control Module (PCM), the ‘brain’ of your vehicle’s engine and transmission, is often the source of these perplexing issues. This isn’t just a replacement part; it’s a fully programmed, ready-to-install solution designed to get you back on the road with confidence. We take your vehicle’s VIN and flash this module with the latest factory software from GM, ensuring it communicates perfectly with your specific vehicle right out of the box.
Case Study: A Tricky Diagnosis
I remember a 2004 Chevy Tahoe that came into my shop a few years back. The owner was at his wit’s end. It would randomly stall at stoplights, the transmission would slam into gear, and he had a collection of seemingly unrelated trouble codes. He’d already replaced a few sensors with no luck. After connecting my scan tool and monitoring live data, I noticed the PCM’s voltage readings were fluctuating wildly. This is a classic sign of internal failure. We installed a VIN-programmed PCM just like this one, and it was like a new truck. All the ghost-in-the-machine problems vanished instantly. This is why a reliable, correctly programmed 2003 Isuzu Ascender PCM is a critical fix, not just a part swap.
Is Your Truck or SUV Showing These Signs?
A failing PCM can cause a wide range of symptoms that can be easily mistaken for other issues. If you’re experiencing any of the following, your engine computer could be the culprit:
- ✔ Check Engine Light is on with codes like P0601, P0606, or other communication errors (U-codes).
- ✔ The engine cranks but refuses to start.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A noticeable drop in fuel economy.
- ✔ Stalling, stumbling, or rough idling for no apparent reason.
- ✔ Communication issues with your diagnostic scan tool.
A Straightforward Guide to Installation
One of the biggest benefits of our service is simplicity. Because we program the module for you, the installation is a straightforward mechanical swap that most DIYers can handle in their own driveway. No special tools or trips to the dealer are required.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes before beginning.
- Locate the Old PCM: On most of these GM trucks and SUVs, the PCM is located in the engine bay, either on the driver’s side next to the air filter box or under the battery tray.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed PCM into place. Firmly reconnect the electrical harnesses, ensuring they click and lock securely.
- Reconnect and Start: Reattach the negative battery terminal. In some cases, a simple security relearn procedure may be needed, which typically involves turning the key to the ‘On’ position for 10-15 minutes. Start the engine and enjoy your smooth-running vehicle!
Verified Vehicle Compatibility
This module is a direct replacement for service number 89017734 and is also compatible with part numbers 89017750, 12582605, 12589463, 12602802, and 28042802. It is guaranteed to fit a wide range of GM vehicles. Please match your vehicle from the list below:
ISUZU ASCENDER 03 (5.3L)
Cadillac:
ESCALADE 03-06, ESCALADE ESV 03-06, ESCALADE EXT 03-06
Chevrolet:
AVALANCHE 1500 03-06
SILVERADO 1500 PICKUP 03-07 (Classic Style)
SILVERADO 2500 PICKUP 03-07 (Classic Style, 6.0L Gasoline)
SILVERADO 3500 PICKUP 03-07 (Classic Style, 6.0L Gasoline)
SSR 03
SUBURBAN 1500 03-06
SUBURBAN 2500 03-06 (6.0L)
TAHOE 03-06
TRAILBLAZER EXT 03 (5.3L)
GMC:
ENVOY XL 03 (5.3L)
SIERRA 1500 PICKUP 03-07 (Classic Style)
SIERRA 2500 PICKUP 03-07 (Classic Style, 6.0L Gasoline)
SIERRA 3500 PICKUP 03-07 (Classic Style, 6.0L Gasoline)
SIERRA DENALI 03-07 (Classic Style)
YUKON 03-06
YUKON XL 1500 03-06
YUKON XL 2500 03-06 (6.0L)
Hummer:
HUMMER H2 03-07
Frequently Asked Questions
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, you will receive instructions to reply with your vehicle’s 17-digit VIN. We cannot ship the module until we receive this information, as the programming is specific to your truck.
Is any additional programming needed after installation?
No. This module arrives programmed and ready for installation. In some cases, a simple, tool-free security relearn procedure (turning the key on for 10-15 minutes) is required for the vehicle to start. Instructions are included.
Will this fix my specific problem?
If your vehicle’s issues are caused by a faulty PCM, this part will resolve them. It is crucial to properly diagnose the problem. A faulty PCM often sets codes like P0601 or causes multiple, inconsistent system failures.
Where is the PCM located on my vehicle?
For most vehicles on the fitment list, such as the Silverado, Tahoe, and Suburban, the PCM is found in the engine compartment on the driver’s side, often under or next to the battery. On models like the Ascender or Trailblazer, it’s typically next to the air filter housing.
Is this a reliable, long-term solution?
Absolutely. We use tested, high-quality modules and flash them with the latest stable software from GM. This addresses many of the original software bugs and ensures dependable operation for years to come.