Restore Your GM Truck’s Performance and Reliability
Are you experiencing frustrating issues with your 1998 Chevy Blazer, GMC Jimmy, or another compatible GM truck or van? Symptoms like a persistent check engine light, erratic engine behavior, harsh transmission shifting, or even a no-start condition can often be traced back to a single, critical component: the Powertrain Control Module (PCM). As the central computer for your engine and transmission, a failing PCM can create a cascade of problems that are often misdiagnosed, leading to costly and unnecessary repairs of other parts. This VIN-programmed PCM, part number 9355699, is the definitive solution to restore your vehicle’s factory performance and get you back on the road with confidence.
From the Diagnostic Bay
We recently had a 1999 Suburban in the shop that was driving its owner crazy. It had an intermittent stalling problem that two other shops couldn’t solve. They had replaced the fuel pump, crank sensor, and even the ignition module, but the issue persisted. When we hooked up our diagnostic scanner, we noticed that the PCM would randomly lose communication for a split second—just long enough to stall the engine. The root cause wasn’t a faulty sensor, but the main computer itself. We installed a correctly programmed PCM, and the truck has been running flawlessly ever since. It’s a classic case of symptoms pointing in multiple directions, but the true fault lies with the vehicle’s electronic brain.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with communication or internal processor fault codes.
- ✔ Unexplained stalling or engine hesitation, especially after warming up.
- ✔ Harsh, erratic, or delayed automatic transmission shifting.
- ✔ A complete no-start condition where the engine cranks but won’t fire up.
- ✔ Significant decrease in fuel economy and noticeable loss of power.
- ✔ Inability for a scan tool to communicate with the vehicle’s computer.
- ✔ Other modules, like the ABS or airbag system, may post ‘loss of communication with PCM’ codes.
The Right Solution: A VIN-Programmed 1998 Blazer S10 PCM
Simply swapping a used computer from another vehicle won’t work. Modern vehicles require the PCM to be programmed specifically to their Vehicle Identification Number (VIN). This process ensures all vehicle-specific options, emissions calibrations, and security systems function correctly. Our service eliminates the guesswork and the need for an expensive trip to the dealership. When you purchase this module, we will flash it with the latest GM-certified software updates using your vehicle’s VIN. This not only guarantees compatibility but can also resolve factory-known bugs and improve overall drivability and performance.
Simple Installation Process
This PCM is a direct-fit replacement for the original unit. While the physical installation is straightforward, please be aware that after installation, two procedures may be required for your vehicle to start and run correctly:
- Security Relearn Procedure: Your vehicle’s anti-theft system (VATS/Passlock) needs to be synchronized with the new PCM. This can often be done without special tools and instructions can be readily found for your specific model.
- Crankshaft Variation (CASE) Relearn: For optimal engine performance and to prevent a misfire-related check engine light, a CASE relearn may be necessary. This procedure requires a compatible professional-grade scan tool.
Guaranteed Fitment for Part Number 9355699
This Electronic Control Module is a direct replacement for service numbers 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, and 9366810. It is compatible with a wide range of GM trucks and vans. Please verify your vehicle is on the list below and that your original module carries one of these service numbers.
EXPRESS 2500 VAN 98 Electronic Control Module; gasoline, ID 9355699
SAVANA 1500 VAN 99 Electronic Control Module; (LH rear engine compartment), ID 9355699
ESCALADE 99 Electronic Control Module; (LH front engine compartment), ID 9355699
SAFARI (GMC) 98 Electronic Control Module; (LH front by battery), ID 9355699
SAVANA 1500 VAN 98 Electronic Control Module; ID 9355699
SUBURBAN 1500 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
ASTRO 98 Electronic Control Module; (LH front by battery), ID 9355699
SAVANA 3500 VAN 98 Electronic Control Module; gasoline, ID 9355699
BRAVADA 98 Electronic Control Module; (6-262, 4.3L), w/o build date opt ZN4; ID 9355699
EXPRESS 1500 VAN 98 Electronic Control Module; ID 9355699
SAVANA 2500 VAN 99 Electronic Control Module; (LH rear engine compartment), gasoline, ID 9355699
TAHOE 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
YUKON 98-99 Electronic Control Module; (LH engine compartment), ID 9355699
SAVANA 2500 VAN 98 Electronic Control Module; gasoline, ID 9355699
CHEVROLET 2500 PICKUP 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
ENVOY 98 Electronic Control Module; (RH front engine compartment), w/o build date opt ZN4; ID 9355699
SUBURBAN 2500 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
CHEVROLET 1500 PICKUP 99 Electronic Control Module; 5.7L, (LH engine compartment), ID 9355699
GMC 1500 PICKUP 99 Electronic Control Module; 5.0L, (LH engine compartment), ID 9355699
CHEVROLET 3500 PICKUP 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
EXPRESS 2500 VAN 99 Electronic Control Module; (LH rear engine compartment), gasoline, ID 9355699
ISUZU HOMBRE 98 Electronic Control Module; 4.3L (6 cylinder), w/o extended build date opt ZN4; ID 9355699
EXPRESS 1500 VAN 99 Electronic Control Module; (LH rear engine compartment), ID 9355699
EXPRESS 3500 VAN 98 Electronic Control Module; gasoline, ID 9355699
S10/S15/SONOMA 98 Electronic Control Module; 6-262 (4.3L), w/o build date opt ZN4; ID 9355699
BLAZER S10/JIMMY S15 98 Electronic Control Module; (RH front engine compartment), w/o build date opt ZN4; ID 9355699
EXPRESS 3500 VAN 99 Electronic Control Module; (LH rear engine compartment), gasoline, ID 9355699
GMC 1500 PICKUP 99 Electronic Control Module; 5.7L, (LH engine compartment), ID 9355699
SAVANA 3500 VAN 99 Electronic Control Module; (LH rear engine compartment), gasoline, ID 9355699
GMC 1500 PICKUP 98 Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
GMC 2500 PICKUP 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
CHEVROLET 1500 PICKUP 98 Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
GMC 3500 PICKUP 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, please send us a message with your vehicle’s 17-digit VIN. We cannot ship your module until we receive this information, as it is essential for the programming process.
Is this module ready to install when it arrives?
Yes, it comes programmed to your VIN and is ready for physical installation. However, as mentioned above, you will likely need to perform a security relearn procedure for the vehicle to start, and a CASE relearn is recommended for optimal performance.
What if my original part number is slightly different?
This module replaces several compatible service numbers, including 16266645, 16250279, and others listed. As long as your vehicle is on the fitment list and your original part number is one of the listed compatible numbers, this module will work correctly once programmed.
Is this a new part?
No, this is a quality tested, genuine used OEM part sourced from a salvaged vehicle. Each unit is inspected and verified to be fully functional before being programmed and shipped.
Do I need to return my old PCM?
No, there is no core charge or requirement to return your original computer. You can keep it or dispose of it as you see fit.