Is Your GM Van or Truck Running Rough?
If you’re dealing with a frustrating no-start condition, erratic engine behavior, a persistent Check Engine Light, or poor fuel mileage in your 1998-1999 GM vehicle, a failing Powertrain Control Module (PCM) is a very common culprit. As a technician with over two decades of experience, I’ve seen these exact issues hundreds of times. The PCM is the brain of your engine and transmission, and when it starts to fail, it can create a cascade of problems that are often misdiagnosed, leading to wasted time and money on unnecessary parts.
Real-World Diagnosis: A Customer Story
“A customer’s ’99 Chevy Suburban came into my shop last month. It would randomly stall at stoplights and sometimes wouldn’t start at all. They had already replaced the fuel pump and the ignition control module based on advice from forums, but the problem persisted. After hooking up my scan tool and monitoring live data, I saw the injector pulse width dropping out intermittentlyโa classic sign of a failing PCM driver. We installed a VIN-programmed PCM just like this one, and the truck has been running perfectly ever since. Don’t just throw parts at the problem; fix the root cause.”
The Direct-Fit Solution: A Programmed 1998-1999 Savana 1500 PCM
This isn’t just a used part pulled from a yard. This is a fully tested, OEM Powertrain Control Module that we program specifically for your vehicle before it ships. By providing us with your Vehicle Identification Number (VIN) at checkout, we flash the module with the latest official GM software updates. This process corrects known factory bugs, improves driveability, and ensures the PCM communicates perfectly with your vehicle’s specific optionsโfrom the engine and transmission to the emissions equipment.
Key Benefits of This VIN-Programmed PCM:
- โ Eliminate Guesswork: Solves common issues like harsh shifting, stalling, no-start, and false sensor codes.
- โ Plug-and-Play Installation: Arrives ready to install. No expensive trip to the dealership for programming is required.
- โ Latest GM Software: We load the most current calibration for your VIN, often improving performance and efficiency over the original software.
- โ Guaranteed Compatibility: This module, identified by service ID 9355699, is the correct replacement for a wide range of GM trucks and vans. It directly replaces part numbers including 09366810, 16266645, 16250279, and more.
Simple Installation Guide
You can get your vehicle back on the road in under 30 minutes with basic hand tools. Hereโs how:
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On a Savana or Express van, the PCM is typically located in the engine compartment on the driver’s side, near the firewall. On pickups and SUVs, it’s usually on the driver’s side fender well.
- Disconnect the Old Module: Carefully unplug the large electrical connectors. There are typically release tabs you need to lift or slide. Never force them.
- Swap the Modules: Unbolt the old PCM and install the new one in its place.
- Reconnect Everything: Firmly plug the electrical connectors into your new PCM until they click into place. Reconnect the negative battery terminal.
- Final Check: Start the vehicle. The check engine light may stay on for a short drive cycle as the computer completes its self-tests.
Expert Pro Tip: Connector Inspection
Before plugging in your new PCM, take a moment to inspect the vehicle’s harness connectors. Use a flashlight to look for any signs of corrosion (a white or green powdery substance) or any bent or pushed-out pins. A poor connection is a common point of failure and can damage your replacement module. If you see any corrosion, clean it carefully with a dedicated electronics cleaner and a small brush.
Is This the Right Part for Your Vehicle?
This PCM is the correct fit for a huge range of 1998-1999 General Motors vehicles that use the service ID 9355699. This includes the Chevrolet Express, GMC Savana, Chevy/GMC Pickups (1500/2500/3500), Tahoe, Yukon, Suburban, Escalade, and many more. Please review the detailed fitment list to confirm compatibility. Ordering this programmed 1998-1999 Savana 1500 PCM is the most reliable way to restore your vehicle’s proper function and get back on the road with confidence.