Is Your GM Truck or Van Running Rough, Stalling, or Not Starting at All?
As a mechanic with over two decades of experience, I’ve seen countless late-90s GM vehicles roll into the shop with frustrating, hard-to-diagnose electronic issues. Often, the culprit is a failing Powertrain Control Module (PCM). If you’re dealing with a persistent Check Engine Light, erratic transmission shifting, poor fuel economy, or a vehicle that just won’t fire up, you’ve likely found the source of your problem. This isn’t just a part; it’s the solution to getting your reliable workhorse back on the road.
This is a genuine, road-tested used GM Electronic Control Module, service number 9355699. We take the guesswork and high cost out of the repair. Before this module ships, we professionally program it with the latest GM software updates, tailored specifically to your vehicle using the VIN you provide. This means it arrives at your door ready for a straightforward installation, with no need for an expensive trip to the dealership for programming.
Symptoms of a Failing GM PCM:
If you’re experiencing any of the following, a faulty computer is a very likely cause. I’ve personally traced these symptoms back to the PCM on hundreds of GM trucks and vans from this era.
- ✔ No-start condition or intermittent starting
- ✔ Persistent Check Engine Light (CEL) with communication-related codes
- ✔ Poor or erratic automatic transmission shifting
- ✔ Noticeable decrease in fuel efficiency
- ✔ Engine stalling, stumbling, or misfiring
- ✔ Failure to pass an emissions test
Real-World Diagnostic Story
“A customer’s ’99 Suburban came in last week with a classic no-start. It had spark and fuel pressure, but the injectors weren’t firing. After checking all the basics, we hooked up the scan tool and found it couldn’t communicate with the PCM. We tested the power and ground pins at the PCM connector—they were perfect. That confirmed the module itself had failed internally, a common issue on these units after 20+ years of heat cycles. We installed one of our pre-programmed modules, and the truck fired right up on the first try. This is the exact fix that customer needed.”
Why Choose Our Pre-Programmed 1998-1999 Savana 3500 PCM?
This isn’t just another part pulled from a yard. It’s a complete service. We handle the complex part of the job—the programming—so you can focus on the simple installation. This module is a direct replacement for a wide range of popular GM vehicles, restoring factory performance and communication between your engine, transmission, and other vehicle systems.
Simple, Direct-Fit Installation
- Safety First: Disconnect the negative battery terminal and wait a few minutes for any residual power to drain.
- Locate the Module: On most of these trucks and vans, the PCM is located in the engine compartment, often on the driver’s side inner fender or near the battery.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old module. Inspect the pins for any corrosion or damage.
- Remove Old PCM: Unbolt the old module from its mounting bracket.
- Install New PCM: Bolt the new, pre-programmed module into place and securely reconnect the wiring harnesses. You should hear a ‘click’ as they lock in.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn (If Necessary): In some cases, a simple security relearn procedure is required. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Your vehicle’s service manual will have the specific steps.
Guaranteed Compatibility & Fitment
To ensure a perfect match, please verify that your original module has one of the following service numbers printed on the label. This unit is a direct replacement for part numbers:
09355699, 16266645, 16250279, 16258815, 09366810, 9366810
This module fits a huge range of 1998-1999 Chevrolet, GMC, Cadillac, Oldsmobile, and Isuzu models, including the Savana, Express, Suburban, Tahoe, Yukon, C/K Pickups, S10/Blazer, and more. Please use the compatibility chart to confirm fitment for your specific vehicle and options.
IMPORTANT: After purchasing, please send us a message with your vehicle’s 17-digit VIN. We cannot ship your order until we have this information to perform the programming.