Restore Your Van’s Performance and Reliability
Is your GMC Savana or Chevy Express van giving you headaches? Stalling for no reason, failing to start, or showing a persistent Check Engine Light? As a technician with over two decades of experience, I’ve seen these symptoms countless times, and they often point directly to a failing Powertrain Control Module (PCM). This isn’t just an inconvenience; it’s a critical failure that affects fuel economy, emissions, and drivability. This listing is for a dependable, tested, and pre-programmed PCM that serves as the brain for your vehicle’s engine and transmission, ensuring everything works in harmony just as the factory intended.
We take the guesswork and hassle out of the repair. This is a genuine, used OEM module sourced from a salvaged vehicle, which we then program with the latest GM software updates specifically for your vehicle. All we need is your VIN. This means you get a reliable part that’s ready to install right out of the box, saving you from a costly trip to the dealership for programming. This is the straightforward, effective solution to get your workhorse back on the road and running smoothly.
From the Diagnostic Bay
I remember a 1999 Chevy Suburban that came into my shop with a maddening intermittent no-start condition. The owner had already replaced the battery, starter, and fuel pump. It would run fine for days, then refuse to start. No codes were stored initially. After hooking up my scan tool and monitoring live data during a crank/no-start event, I saw the injector pulse width was zero. The PCM wasn’t commanding the injectors to fire. A quick check of the power and grounds to the PCM confirmed they were solid. The culprit was an internal failure in the original computer, a common issue on these older GM trucks due to heat cycles and vibration. We installed a VIN-programmed module just like this one, performed the security relearn, and the truck fired up instantly. It never came back for that issue. This is why a quality, correctly programmed 1998-1999 Savana 2500 PCM is more than just a part—it’s the definitive fix.
Is Your GM Truck or Van Showing These Signs?
- ✔️ Unexplained Check Engine Light (CEL) illumination
- ✔️ Engine stalling, stumbling, or misfiring
- ✔️ Complete no-start condition where the engine cranks but won’t fire
- ✔️ Harsh or erratic automatic transmission shifting
- ✔️ Poor fuel mileage and overall performance degradation
- ✔️ Failed emissions inspection
- ✔️ Diagnostic Trouble Codes (DTCs) such as P0601, P0604, or P0605 pointing to internal module failure
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
- ✔ Locate the PCM: On most Savana/Express vans, the PCM is located in the engine compartment on the driver’s side, near the battery or air filter housing.
- ✔ Disconnect and Remove: Carefully unplug the electrical connectors. There are typically levers or tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket.
- ✔ Install the New Module: Bolt the replacement PCM into the mounting bracket and securely reconnect all electrical harnesses. Ensure they click into place.
- ✔ Reconnect Battery: Re-attach the negative battery terminal and tighten it.
- ✔ Perform Security Relearn (CRITICAL): Your vehicle’s Passlock/VATS anti-theft system must relearn the new PCM. The typical procedure is: Turn the key to the ‘ON’ position (don’t start) for 10-15 minutes, or until the ‘Security’ light on the dash stops flashing and goes out. Turn the key ‘OFF’ for 10 seconds. Repeat this cycle two more times for a total of three cycles. On the fourth attempt, the vehicle should start and run.
Verified Vehicle Compatibility
This module, identified by service number 9355699, is a direct replacement for part numbers 09355699, 16266645, 16250279, 16258815, and 9366810. It is guaranteed to fit a wide range of 1998-1999 GM trucks and vans, including:
- GMC Savana / Chevrolet Express Vans (1500, 2500, 3500): 1998-1999 (Gasoline engines)
- GMC Sierra / Chevrolet C/K Pickups (1500, 2500, 3500): 1998-1999 (Gasoline engines)
- GMC Yukon / Chevrolet Tahoe: 1998-1999 (Gasoline engines)
- Chevrolet Suburban (1500, 2500): 1998-1999 (Gasoline engines)
- Cadillac Escalade: 1999
- GMC Safari / Chevrolet Astro: 1998
- GMC Envoy / Oldsmobile Bravada / Chevrolet S10 Blazer / GMC S15 Jimmy: 1998 (4.3L V6)
- Chevrolet S10 / GMC Sonoma / Isuzu Hombre: 1998 (4.3L V6)
Note: Please match your part number or contact us with your VIN to confirm perfect fitment for your specific application. This is the correct 1998-1999 Savana 2500 PCM and fits many other models.
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the PCM with the exact software and calibrations for your van’s specific engine, transmission, and options. This ensures seamless communication and proper function, eliminating the need for dealer programming.
Is this a new part?
No, this is a high-quality, used OEM part that has been carefully removed from a salvaged vehicle. Each unit is inspected and tested before being programmed and shipped, offering a reliable and cost-effective solution.
Will I need to do anything after installing it?
Yes. After physical installation, you must perform the security relearn procedure outlined in the installation guide. This simple process syncs the new PCM with your vehicle’s anti-theft system and typically takes about 30 minutes to complete using only your ignition key.
What if my part number is slightly different?
This module is a direct replacement for several part numbers, including 09355699, 16266645, and others listed. As long as your vehicle is on the compatibility list and you provide your VIN, we will ensure it is programmed correctly for your application.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both engine and transmission functions. If the module is failing, it can cause erratic shifting, delayed engagement, or incorrect gear selection. Replacing a faulty PCM often resolves these issues.