Is Your GM Truck or Van Running Rough?
If your 1998-1999 GMC Savana, Chevy Express, or other compatible GM truck is suffering from frustrating issues like a persistent check engine light, stalling, rough idling, or a complete no-start condition, a failing Powertrain Control Module (PCM) is often the culprit. The PCM is the central computer of your vehicle, managing everything from fuel injection and spark timing to transmission shifting. When it fails, it can cause a wide range of perplexing and performance-robbing symptoms. Don’t let a faulty computer keep your reliable GM vehicle off the road. This is your direct, hassle-free solution.
From the Diagnostic Bay
We had a 1999 Chevy Suburban come in that was driving the owner crazy. It would run fine for days, then suddenly stall at a stoplight and refuse to restart for 20 minutes. He’d replaced the fuel pump and ignition coil, but the problem persisted. After hooking up our scanner, we noticed intermittent communication loss with the PCM. Instead of a costly and time-consuming diagnostic rabbit hole, we recommended a pre-programmed PCM. We ordered this exact unit, provided the customer’s VIN, and it arrived ready to install. After a simple security relearn procedure, the Suburban was back on the road, and the stalling issue was completely gone. It’s a testament to how a correctly programmed module can be a straightforward fix for a complex problem.
The Plug-and-Play Solution: A VIN-Programmed PCM
This isn’t just a used part pulled from a random vehicle. This is a tested, OEM Powertrain Control Module, part number 9355699, that we program specifically for your vehicle. Before we ship it, we use your vehicle’s unique Vehicle Identification Number (VIN) to flash the module with the latest, most stable software updates from General Motors. This critical step ensures that the computer has the correct parameters for your engine, transmission, and factory options, making installation as simple as possible.
Symptoms of a Failing GM PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling or cutting out intermittently.
- ✔ Rough or erratic idling.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or incorrect transmission shifting.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
- ✔ Failure to communicate with diagnostic scan tools.
Why Choose Our Programmed 1998-1999 Savana PCM?
Buying a used computer from a salvage yard means you still have to take it to a dealership for expensive programming. Our service eliminates that step. We bridge the gap by providing a reliable, OEM part that is already prepared for your vehicle. This unit is a direct replacement for multiple part numbers, including 09355699, 16266645, 16250279, 16258815, and 09366810, and fits an extensive list of GM trucks and vans from the 1998-1999 model years. By matching the part ID and providing your VIN, you ensure a perfect match and restore your vehicle’s original performance and reliability.
This module is compatible with a wide array of vehicles beyond the Savana, including the Chevrolet Express, Suburban, Tahoe, C/K Pickups, S10, Blazer, and their GMC counterparts like the Yukon, Jimmy, and Sonoma, as well as the Cadillac Escalade and Oldsmobile Bravada. Please verify your original part number and consult the detailed fitment list to confirm compatibility.
Frequently Asked Questions
What is a PCM and why is it important?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It controls the engine and transmission functions to ensure optimal performance, fuel efficiency, and emissions. A faulty PCM can lead to a wide range of drivability problems.
Why do I need to provide my VIN?
Your VIN (Vehicle Identification Number) allows us to program the PCM with the exact software and calibrations for your specific engine, transmission, and factory options. This ensures the computer works correctly right out of the box.
Is this part difficult to install?
The physical installation is typically straightforward, involving disconnecting the battery and swapping the module. While our programming makes it nearly plug-and-play, some GM vehicles of this era may require a simple ‘security relearn’ procedure, which can be done without special tools and takes about 30 minutes. Instructions are readily available online.
How can I be sure my old PCM is the problem?
While the symptoms listed are strong indicators, it’s always best to have a proper diagnosis performed by a qualified mechanic. Common checks include verifying power and ground to the module and checking for communication with a scan tool. If the module is not communicating or has internal fault codes, it’s very likely the cause.
Is this a used computer?
Yes, this is a genuine OEM computer sourced from a salvaged vehicle. Each unit is inspected and tested to ensure it is fully functional before being programmed and shipped to you. This provides OEM quality and reliability.