Is Your GM Truck or Van Running Rough?
If your late-90s Chevrolet or GMC truck or van is experiencing perplexing issues like stalling, erratic idling, a no-start condition, or a persistent check engine light, the problem might be deeper than a simple sensor. The Powertrain Control Module (PCM), the electronic brain of your vehicle, is a common point of failure on these otherwise robust workhorses. When the PCM fails, it can cause a cascade of frustrating and hard-to-diagnose symptoms, leaving you stranded and your vehicle unreliable. This isn’t just an inconvenience; it’s a critical failure that affects performance, fuel economy, and safety.
The Right Solution for a Complex Problem
Replacing the PCM isn’t as simple as swapping a battery. Each module is specifically calibrated for the vehicle it came from, considering the engine size, transmission type, emissions equipment, and other factory options. Simply installing a used computer from another vehicle will almost certainly result in poor performance or a vehicle that won’t start at all. Our solution eliminates the guesswork and the need for expensive dealership programming. We offer a genuine, used GM PCM (part number 09366810 and its interchanges) that is professionally programmed to your specific Vehicle Identification Number (VIN). This ensures that the computer you receive is a perfect match for your vehicle’s original factory specifications, loaded with the latest software updates from GM for optimal performance and reliability.
From the Diagnostic Bay
We had a 1999 Suburban towed in that had its owner completely stumped. The vehicle would crank but never start. The owner, following online advice, had already replaced the fuel pump, ignition coil, and crank sensor, with no success. After a thorough diagnostic check, we found that the PCM’s internal driver for the fuel pump relay had failed. There was no signal being sent to activate the pump. We installed one of our VIN-programmed PCMs, performed the quick security relearn, and the truck fired up on the first try. It’s a classic case of how a faulty computer can mimic other, more common failures. Don’t just replace parts; solve the root problem.
Diagnosing a Faulty 1998-1999 Savana PCM
A failing Powertrain Control Module can manifest in numerous ways. If you’re experiencing any of the following, your PCM should be a primary suspect. This module is the central command for all engine and transmission operations, so its failure can have wide-ranging effects on your vehicle’s drivability.
Common Symptoms of PCM Failure
- ✔ Check Engine Light: The light may be on with communication error codes (U-codes) or codes indicating an internal processor fault.
- ✔ No-Start or Hard Starting: The engine cranks but won’t fire up, or takes an excessively long time to start.
- ✔ Engine Stalling: The engine may stall intermittently, especially when coming to a stop or at idle.
- ✔ Poor Performance & Fuel Economy: You may notice a significant drop in power, hesitation during acceleration, and a noticeable decrease in miles per gallon.
- ✔ Erratic Shifting: The automatic transmission may shift harshly, at the wrong times, or not at all.
- ✔ Intermittent Issues: Problems may appear randomly and seem to resolve themselves, often becoming more frequent over time.
Why Choose Our VIN-Programmed PCM?
This isn’t just a used part pulled from a junkyard. It’s a cost-effective, reliable solution. Each unit is sourced from a salvaged vehicle, inspected, and then meticulously programmed using professional tools and official GM software. By providing your VIN at checkout, you guarantee that the module you receive is ready for installation, effectively making it a plug-and-play repair. This process restores the original functionality and incorporates any performance and longevity improvements GM has released since your vehicle was new. This service is essential for proper function of the anti-theft system (Passlock), transmission control, and emissions systems.
This PCM is a direct replacement for multiple part numbers, including 09355699, 16266645, 16250279, 16258815, and 09366810. Our programming service ensures that regardless of the number on the case, the software inside is a perfect match for your truck or van.
Frequently Asked Questions
What information do you need from me?
After you place your order, we will need your vehicle’s 17-digit VIN (Vehicle Identification Number). This allows us to program the computer with the exact software and calibrations for your specific make, model, and options.
Is this part difficult to install?
The physical installation is straightforward for a DIY mechanic. The PCM is typically located in the engine compartment. After installation, you may need to perform a simple security relearn procedure, which can usually be done without special tools. Instructions are widely available online for GM’s Passlock or VATS systems.
Is this a new part?
No, this is a high-quality, tested used part sourced from a salvaged vehicle. This provides a reliable and affordable alternative to a costly new module from a dealership.
Will this fix my specific problem?
While this PCM will correct issues caused by a faulty computer, it’s crucial to properly diagnose your vehicle. A PCM failure can mimic other problems like a bad fuel pump or faulty sensors. We recommend a professional diagnosis to confirm the PCM is the root cause of your issue.
What vehicles does this fit?
This module fits a wide range of 1998-1999 GM trucks, vans, and SUVs, including the Savana, Express, Silverado, Sierra, Tahoe, Yukon, Suburban, and more. Please check the detailed fitment list on this page to confirm compatibility with your specific vehicle.