Restore Your Van’s Core Performance and Reliability
Is your 1998 or 1999 GMC Savana 1500 van giving you headaches? Unexplained stalling, a persistent Check Engine Light, or a complete no-start situation can bring your work or travels to a grinding halt. The Powertrain Control Module (PCM) is the brain of your vehicle, managing everything from fuel delivery and spark timing to transmission shifting. When it fails, the symptoms can be unpredictable and frustrating. This isn’t just an inconvenience; it’s a reliability issue that can cost you time and money.
This is a dependable, tested, and pre-programmed replacement PCM that solves those issues. We take a genuine, used OEM computer and flash it with the latest official GM software calibrated specifically to your van’s Vehicle Identification Number (VIN). This ensures that once installed, it communicates perfectly with your engine, transmission, and all related systems, restoring the smooth operation you depend on. Forget expensive dealership visits and programming fees; this 1998-1999 Savana 1500 PCM arrives at your door ready for a straightforward installation.
From the Diagnostic Bay: The Case of the Stalling Work Van
I remember a local contractor bringing in his ’99 Savana 2500, a nearly identical setup to the 1500. His van would run fine for an hour, then stall at a stoplight and refuse to restart for 20 minutes. No consistent codes, just a P0601 (Internal Control Module Memory Check Sum Error) that would pop up intermittently. He’d already replaced the fuel pump and crank sensor. After confirming good fuel pressure and spark during a no-start event, we focused on the PCM. Heat soak was causing an internal failure. We installed a VIN-programmed module just like this one, and the van was back on the job site the next day, running without a single hiccup. It’s a classic failure mode for these older GM PCMs, and a direct replacement is the definitive fix.
Common Signs of a Failing GM PCM
- âś” Check Engine Light is on with codes like P0601, P0602, or other communication errors.
- âś” The engine cranks but will not start.
- âś” Unexpected stalling, especially after the engine warms up.
- âś” Harsh or erratic automatic transmission shifting.
- âś” A noticeable drop in fuel economy.
- âś” Misfires or rough running that can’t be traced to plugs, wires, or coils.
- âś” Failure to pass an emissions inspection.
A Straightforward Guide to Installation
Installing your replacement 1998-1999 Savana 1500 PCM is a job most DIYers can handle in under an hour with basic hand tools. This module is located in the LH rear of the engine compartment.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On your Savana van, you’ll find the PCM mounted in the engine bay, typically on the driver’s side towards the firewall.
- Disconnect the Connectors: Carefully unclip and remove the electrical wiring harnesses from the old PCM. The levers on the connectors make this easier. Inspect them for any corrosion or damage.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your replacement PCM onto the bracket and securely re-connect all wiring harnesses. You should hear a ‘click’ as they lock into place.
- Reconnect the Battery: Re-attach the negative battery terminal.
- Perform Security Relearn: Your vehicle may require a simple security relearn procedure (often called VATS or Passlock). This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Instructions are readily available online for your specific model.
Verified Vehicle Compatibility
This module, identified by service number 16266645 or Holley ID 9355699, is a direct replacement for a wide range of GM trucks and vans. While this listing is focused on the 1998-1999 Savana 1500 PCM, it also fits the following vehicles. Always match your part number or the ID number (9355699) to ensure compatibility.
- Chevrolet Express / GMC Savana 1500/2500/3500 Van (1998-1999)
- Chevrolet / GMC C/K 1500/2500/3500 Pickup (1998-1999)
- Chevrolet Tahoe / GMC Yukon (1998-1999)
- Chevrolet Suburban 1500/2500 (1998-1999)
- Cadillac Escalade (1999)
- Chevrolet Astro / GMC Safari (1998)
- Chevrolet S10 / GMC Sonoma (1998)
- Chevrolet Blazer / GMC Jimmy (1998)
- Oldsmobile Bravada (1998)
- GMC Envoy (1998)
- Isuzu Hombre (1998, 4.3L)
Note: This part fits models with specific options and engine sizes as detailed in the original fitment data. Please provide your VIN upon purchase to guarantee we send the correctly programmed module for your exact vehicle configuration.
Frequently Asked Questions
How does the VIN programming work?
After you complete your purchase, simply send us your 17-digit VIN. Our technicians use this number to access the official GM database and load the correct, updated software for your specific vehicle onto the PCM before we ship it. This ensures it works correctly right out of the box.
Is this part difficult to install myself?
Not at all for most people with basic tools. It’s a matter of disconnecting the battery, unplugging the old module, and plugging in the new one. The only extra step is a simple security relearn procedure that takes about 10-15 minutes and doesn’t require special tools.
Will I need to do anything else after installation?
Besides the security relearn, no. Since we program it beforehand, you avoid a trip to the dealer for flashing. In some rare cases, a Crankshaft Position Variation (CASE) relearn might be needed with a scan tool for optimal performance, but the vehicle will run and drive without it.
Why choose a used OEM part over a new aftermarket one?
Used OEM parts, like this one, were built to GM’s original, high-quality standards. They often offer superior reliability and a perfect fit compared to some aftermarket alternatives. Paired with fresh programming, it’s a cost-effective and dependable solution.
What if my part number is slightly different?
This module is a direct replacement for several part numbers, including 09355699, 16250279, 16258815, and 9366810. As long as your original module carries one of these numbers, this part will work perfectly once programmed to your VIN.