Restore Peak Performance to Your GM Truck or SUV
Is your 1998-1999 GM vehicle suffering from strange electrical gremlins, a persistent Check Engine Light, or poor running conditions? The Powertrain Control Module (PCM), the central computer of your vehicle, is often the culprit. This genuine, used OEM PCM, part number 09355699, is the reliable and cost-effective solution to get your truck or SUV running like new. We take the guesswork out of the repair by programming the module specifically to your vehicle’s VIN before it ships, ensuring a straightforward installation process.
The Brain of Your Vehicle’s Operation
The PCM is responsible for managing a complex network of sensors and systems, including fuel delivery, ignition timing, transmission shifting, and emissions controls. When it begins to fail, the symptoms can be widespread and confusing. A faulty module can leave you stranded or cause long-term damage to other components. Replacing it with a quality, correctly programmed unit is critical for your vehicle’s health and reliability.
From the Diagnostic Bay
We had a ’99 Tahoe come into the shop on a tow hook. The customer said it would crank but never start, and sometimes it would die while driving. The fuel pump was new, and the ignition system checked out. After connecting our scan tool, we found a ‘No Communication with PCM’ error. We swapped in a known-good test module, and it fired right up. The original PCM had an internal failure. We ordered one of these VIN-programmed units for the customer, performed the quick security relearn, and had them back on the road the next day. A pre-programmed module saved hours of diagnostic time and the hassle of towing it to a dealership for flashing.
Diagnosing and Replacing Your 1998 Blazer S10 PCM
If you’re experiencing issues with your vehicle, it’s essential to confirm the PCM is the root cause. While a professional diagnosis is always recommended, a failing module often presents a clear set of symptoms. This replacement part is a direct fit for a wide range of popular GM models from the era, including the Chevy Blazer, GMC Jimmy, Tahoe, Yukon, Suburban, and various pickup and van models. By providing us with your VIN, you receive a module with the latest GM software updates, tailored specifically for your vehicle’s original configuration. This ensures all systems, from the engine to the transmission, function exactly as the factory intended.
Common Symptoms of a Failing GM PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes
- ✔ Engine cranks but will not start
- ✔ Stalling, rough idling, or misfiring
- ✔ Poor fuel economy and decreased engine power
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Failure to communicate with diagnostic scan tools
- ✔ Intermittent electrical issues affecting gauges or accessories
This unit is a direct replacement for multiple part numbers, including 16266645, 9355699, 16250279, 16258815, 09366810, and 9366810. Please verify your original part number to ensure compatibility.
Frequently Asked Questions
Do I need to do any programming after I receive this PCM?
We program the module to your vehicle’s VIN before shipping, which handles the main software configuration. However, on most of these GM vehicles, you will need to perform a simple Security Relearn procedure (also known as a Passlock or VATS relearn) to sync the module with your vehicle’s anti-theft system. This can typically be done without any special tools and takes about 30 minutes. We can provide instructions for this procedure.
What is a CASE Relearn and will I need to do one?
A Crankshaft Variation Relearn (CASE Relearn) may be required to prevent a P1336 trouble code. This procedure synchronizes the PCM with the crankshaft position sensor. While not always necessary immediately, it is recommended for optimal performance and can be performed by most professional scan tools at any local repair shop.
How do I provide my VIN number?
After you complete your purchase, please send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your order until we receive this information, as the programming is a required step.
Is this a new part?
No, this is a high-quality, tested, and fully functional used OEM part sourced from a salvaged vehicle. Each unit is inspected and verified to be in excellent working condition before being programmed and shipped.
What if this doesn’t fix my problem?
While this PCM is a common solution for many issues, we always recommend a thorough diagnosis by a qualified technician. If the part does not resolve your issue, please contact us to discuss our return policy. We are committed to helping you get your vehicle repaired correctly.