Is Your 1998 Express Van or GM Truck Running Rough?
If you’re dealing with perplexing issues like a persistent check engine light, erratic transmission shifting, a sudden no-start condition, or poor fuel economy, the problem might be deeper than a simple sensor. In my 20+ years of turning wrenches and diagnosing these exact vehicles, I’ve seen countless owners chase their tails replacing parts, when the real culprit is the vehicle’s brain: the Powertrain Control Module (PCM).
The PCM, also known as the ECM or engine computer, is the master controller for your engine and transmission. After two decades of heat, vibration, and countless electrical cycles, the delicate internal components of the original module can start to fail. This leads to a host of symptoms that can seem random and unrelated, making diagnosis a nightmare for the average DIYer.
Expert Pro Tip From a 20-Year Tech
Before you condemn the PCM, always check the basics first: battery voltage (must be above 12.4V), clean and tight battery terminals, and solid ground connections from the engine block to the chassis. I’ve seen dozens of cases where a simple bad ground mimicked a complete PCM failure. A quick check with a multimeter can save you a lot of time and money. If those are solid and you’re still getting communication errors or multiple unrelated fault codes, the PCM is your most likely suspect.
The Direct Solution: A VIN-Programmed PCM
This isn’t just a replacement part; it’s a complete solution. This PCM, service number 16250279, is the correct computer for a massive range of late-90s GM trucks, vans, and SUVs. The most critical part of the process is that we program it specifically for your vehicle using your VIN before it ships.
Why is this so important? Your vehicle’s VIN is tied to its specific optionsโengine size, transmission type, gear ratios, and even emissions equipment. Our programming service installs the latest, most stable software from General Motors directly onto the module, tailored to your exact build. This eliminates the need for an expensive trip to the dealership for flashing and ensures a true plug-and-play installation.
Key Benefits of This Programmed Module:
- โ Fixes Common Issues: Directly addresses problems like false sensor codes (especially for crank/cam sensors), harsh shifting, engine stalling, and no-communication errors with scan tools.
- โ VIN-Programmed for Your Vehicle: Arrives ready to install with the latest GM software updates for your specific truck or van. Just provide your VIN at checkout.
- โ No Dealer Visit Required: Save hundreds of dollars and the hassle of towing your vehicle to a dealership for programming.
- โ Broad Compatibility: This module is a direct replacement for part numbers 16250279, 09366810, and 09355699, fitting a wide array of popular GM models.
Will This Fit My Vehicle?
This PCM is a workhorse for the GM lineup from this era. While it’s the correct part for a 1998 Chevrolet Express 1500 Van, it also fits many other models. If your original module has the service number 16250279 printed on the label, this is the correct replacement. Common compatible vehicles include:
- โ 1998-1999 Chevrolet & GMC C/K 1500, 2500, 3500 Pickups (Gasoline)
- โ 1998-1999 Chevrolet Tahoe & GMC Yukon (Gasoline)
- โ 1998-1999 Chevrolet & GMC Suburban (Gasoline)
- โ 1998-1999 Chevrolet Astro & GMC Safari Vans
- โ 1998 Chevrolet S10, GMC Sonoma, Blazer, Jimmy, and Oldsmobile Bravada (4.3L)
- โ 1999 Cadillac Escalade
This is not an exhaustive list. Always verify your part number to ensure a perfect match. Once installed, you may need to perform a security relearn procedure, which is a simple process that can be done in your driveway with just the ignition key. Get your reliable GM workhorse back on the road with a brain that’s ready for the job.