Is Your GM Truck or Van Running Rough?
If your 1998-1999 Chevrolet Astro, GMC Safari, or other compatible GM vehicle is suffering from erratic engine behavior, poor fuel economy, harsh shifting, or a persistent check engine light, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer for your engine and transmission, its proper function is critical to your vehicle’s performance, reliability, and efficiency. When it starts to fail, it can create a cascade of frustrating and difficult-to-diagnose issues. Don’t let a faulty computer keep your reliable GM truck off the road. This direct-replacement PCM is the definitive solution to restore your vehicle’s factory performance.
From the Diagnostic Bay
I once had a 1999 GMC Sierra 1500 in the shop with a classic complaint: intermittent stalling and a check engine light that wouldn’t stay off. The owner had already replaced the throttle position sensor, the MAF sensor, and even the fuel pump based on various codes and advice. The problem persisted. When we hooked up our professional scanner, we noticed the data stream from the PCM was dropping out and showing erratic voltage readings. The internal circuits were failing. We installed a VIN-programmed PCM just like this one, and the truck ran perfectly. It’s a powerful reminder that sometimes the problem isn’t the sensors, but the brain reading them.
The Solution: A VIN-Programmed 1998-1999 Astro PCM
This isn’t just a generic, off-the-shelf part. We provide a Powertrain Control Module that is professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This critical step ensures complete compatibility with your vehicle’s factory settings, options, and security systems. By loading the latest GM-certified software updates, we also address common factory bugs and improve overall powertrain efficiency and performance. This eliminates the need for an expensive trip to the dealership for programming, making this a true plug-and-play repair for the skilled DIYer or professional technician.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light: The light is on, and you may have codes related to sensors, emissions, or internal module failure.
- ✔ Poor Engine Performance: Noticeable loss of power, rough idling, stumbling on acceleration, or engine stalling.
- ✔ Reduced Fuel Economy: The engine may run too rich or too lean, causing a significant drop in your MPG.
- ✔ Transmission Issues: Harsh or delayed shifting, or the transmission getting stuck in one gear (limp mode).
- ✔ No-Start Condition: The engine cranks but refuses to start, often due to a lack of fuel injector or ignition coil command from the PCM.
- ✔ Failed Emissions Test: A faulty PCM can prevent the vehicle’s emissions systems from operating correctly.
Why Choose Our Pre-Programmed Module?
Choosing the right replacement PCM is crucial. Our modules are meticulously inspected and then programmed to order. You receive a component that is ready for installation right out of the box. Simply provide your VIN after purchase, and our technicians will handle the complex programming process. This service saves you time, money, and the headache of dealing with dealership appointments. This module is a direct replacement for part numbers 16250279, 09366810, and 09355699, ensuring a perfect fit and function for a wide range of GM vehicles.
Vehicle Fitment Includes (but is not limited to):
- 1998-1999 Chevrolet Astro / GMC Safari
- 1998-1999 Chevrolet & GMC C/K 1500, 2500, 3500 Pickups (Gasoline)
- 1998-1999 Chevrolet Suburban / Tahoe & GMC Yukon (Gasoline)
- 1998-1999 Chevrolet Express / GMC Savana Vans (Gasoline)
- 1999 Cadillac Escalade
- 1998 Chevrolet S10 / GMC Sonoma (4.3L)
- 1998 Chevrolet Blazer / GMC Jimmy / Oldsmobile Bravada (4.3L)
Please verify your part number or consult the detailed fitment list to ensure compatibility with your specific vehicle and options.
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship the module until we have this information, as the programming is essential for the part to work in your vehicle.
Is this a plug-and-play installation?
Yes, this module is programmed to be plug-and-play. However, some GM vehicles of this era may require a security relearn procedure (often called a CASE relearn or Passlock relearn) after installation. This procedure is simple and can typically be done without special tools. Instructions are widely available online for your specific model.
Will this fix my check engine light?
If the check engine light and associated codes are caused by a faulty PCM, this replacement module will solve the issue. It’s important to ensure that the codes are not being caused by other failing components like sensors or wiring before replacing the PCM.
Where is the PCM located on my 1999 Astro Van?
On the 1998-1999 Chevrolet Astro and GMC Safari, the Electronic Control Module is typically located in the engine compartment on the driver’s side, near the battery. Always disconnect the battery before attempting to remove or install any electronic module.
Do I need to return my old PCM?
There is no core charge or requirement to return your old, non-functioning module for this part. You can recycle your old part locally.