Is Your GM Truck or Van Running Rough?
If you’re dealing with a 1998 or 1999 GM vehicle that’s suddenly developed a mind of its ownโstalling, shifting erratically, refusing to start, or flashing a stubborn Check Engine Lightโthe problem often points directly to a failing Powertrain Control Module (PCM). As the brain of your engine and transmission, when the PCM falters, the entire vehicle’s performance suffers. I’ve seen countless work vans and daily drivers in my shop sidelined by these exact issues, leaving their owners frustrated and losing money.
The Direct-Fit Solution: A VIN-Programmed PCM
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take a reliable, tested OEM PCM and program it specifically to your vehicle’s Vehicle Identification Number (VIN). This critical step ensures that the computer has the correct software and the latest operational updates from General Motors, tailored perfectly for your engine, transmission, and factory options. By providing us with your VIN after purchase, you receive a module that is truly plug-and-play, eliminating the need for an expensive trip to the dealership for programming.
Common Symptoms of a Failing PCM:
- โ Persistent Check Engine Light with communication error codes.
- โ Engine cranks but refuses to start (no-start condition).
- โ Rough idling, stalling, or hesitation during acceleration.
- โ Poor fuel economy and noticeable loss of power.
- โ Harsh or erratic automatic transmission shifting.
- โ Inconsistent or non-functional gauges on the instrument cluster.
Expert Pro Tip from a 20-Year Technician
Before you install your new PCM, take five extra minutes to inspect and clean the main electrical connector harness. Over the decades, these connectors can accumulate dirt, oil, and moisture, leading to corrosion on the pins. A poor connection can mimic the symptoms of a failed PCM. I always use a small amount of electrical contact cleaner and a soft brush on the vehicle’s harness plug. This simple step ensures a solid connection and prevents you from chasing a problem that isn’t there.
Simple Installation for the DIYer
You don’t need to be a master mechanic to replace this module. With basic hand tools, you can get your truck or van running properly again. Our pre-programming service makes the job straightforward.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On most of these vehicles, the PCM is located in the engine compartment, typically on the driver’s side fender well or near the battery. In vans like the Savana and Express, it’s often in the LH rear engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Once unplugged, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, programmed PCM into place. Firmly reconnect the electrical harnesses, ensuring they click and lock securely.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn (If Necessary): On these specific GM models, a security relearn procedure is often required to sync the new PCM with your vehicle’s anti-theft system. This is a simple process you can do yourself in about 30 minutes with just the ignition key. We include instructions for this procedure with your order.
Guaranteed Compatibility
This module is a direct replacement for several part numbers. If your original PCM has any of the following numbers on its label, this unit is the correct fit for your vehicle:
- Service Numbers: 16250279, 16266645, 16258815, 09366810, 9366810
- Hardware ID: 09355699, 9355699
Will This Fit My Vehicle?
This 1998-1999 Savana 1500 PCM is also compatible with a wide range of GM trucks and vans from the same era that use the service ID 9355699. Please verify your part number and check the detailed fitment list below:
- Cadillac Escalade (1999)
- Chevrolet/GMC Pickups 1500, 2500, 3500 (1998-1999, Gasoline)
- Chevrolet/GMC Suburban 1500, 2500 (1998-1999, Gasoline)
- Chevrolet Tahoe / GMC Yukon (1998-1999, Gasoline)
- Chevrolet Express / GMC Savana Vans 1500, 2500, 3500 (1998-1999, Gasoline)
- Chevrolet Astro / GMC Safari (1998)
- Chevrolet S10 / GMC Sonoma S15 (1998, 4.3L)
- Chevrolet Blazer / GMC Jimmy (1998)
- Oldsmobile Bravada (1998)
- GMC Envoy (1998)
- Isuzu Hombre (1998, 4.3L)
Note: This is a tested, used OEM part sourced from a salvaged vehicle. It is guaranteed to be fully functional and is programmed with the latest software for optimal performance.