Programmed 1998 Astro PCM 16250279 | Engine Computer Flashed to Your VIN

Restore Your Vehicle’s Brain and Get Back on the Road

Is your 1998 Chevrolet Astro, GMC Safari, or another GM truck from that era acting up? If you’re dealing with frustrating issues like a no-start condition, erratic idling, poor fuel economy, or a persistent Check Engine Light, the problem often lies with a failing Powertrain Control Module (PCM). As the central computer, the PCM is responsible for managing everything from fuel injection and spark timing to transmission shifting. When it fails, the symptoms can be confusing and debilitating. This isn’t just an inconvenience; it’s a critical component for your vehicle’s performance and reliability.

This is a reliable, tested, and used OEM Powertrain Control Module, service number 16250279 (interchangeable with 09355699 and others listed below). We take the guesswork and hassle out of the replacement process. Before we ship it, our technicians will program the module with the latest GM software updates, specifically calibrated to your vehicle’s unique Vehicle Identification Number (VIN). This ensures seamless communication between the computer and all your vehicle’s systems, a step that would otherwise require an expensive trip to a dealership. This is the straightforward, cost-effective solution to get your truck or van running right again.

Is Your GM Vehicle Showing These Symptoms?

A failing PCM can manifest in many ways. If you’re experiencing any of the following, this module is likely the solution you need:

• ✔ Check Engine Light is on with codes related to internal module failure (like P0601, P0605) or communication errors (U-codes).
• ✔ Engine cranks but will not start.
• ✔ Harsh, erratic, or delayed transmission shifting.
• ✔ Unexplained drop in fuel mileage.
• ✔ Engine stalling, stumbling, or misfiring.
• ✔ Failure to pass an emissions test.

A Straightforward Guide to Installation

Installing your programmed 1998 Astro PCM is a job most DIYers can handle in under an hour. Since we program it beforehand, you won’t need any special scan tools.

1. Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
2. Locate the PCM: On most of these vehicles, including the Astro/Safari, the PCM is located in the engine compartment, often near the battery or on the driver’s side fender well.
3. Disconnect the Old Module: Carefully unplug the electrical connectors. These usually have a locking tab or lever that needs to be released. Never force them.
4. Swap the Modules: Unbolt the old PCM and remove it. Mount your new, programmed PCM in the same location.
5. Reconnect Everything: Plug the electrical connectors firmly into the new module until they click into place. Reconnect the negative battery terminal.
6. Perform Security Relearn: In many cases, you will need to perform a simple security relearn procedure (often called the Passlock or Passkey relearn) to sync the new PCM with your vehicle’s anti-theft system. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Instructions are widely available online for your specific model.

Will This Fit My Truck or Van?

This module is a direct replacement for units with service numbers 16250279, 09355699, 16266645, 16258815, or 09366810. It is guaranteed to fit the following vehicles, provided the ID on your original module is 9355699:

• ASTRO 98 (LH front by battery)
• BLAZER S10/JIMMY S15 98 (RH front engine compartment)
• BRAVADA 98 (6-262, 4.3L)
• CHEVROLET 1500/2500/3500 PICKUP 98-99 (Gasoline)
• ENVOY 98 (RH front engine compartment)
• ESCALADE 99 (LH front engine compartment)
• EXPRESS 1500/2500/3500 VAN 98-99 (Gasoline)
• GMC 1500/2500/3500 PICKUP 98-99 (Gasoline)
• ISUZU HOMBRE 98 (4.3L)
• S10/S15/SONOMA 98 (4.3L)
• SAFARI (GMC) 98 (LH front by battery)
• SAVANA 1500/2500/3500 VAN 98-99 (Gasoline)
• SUBURBAN 1500/2500 98-99 (Gasoline)
• TAHOE 98-99 (Gasoline)
• YUKON 98-99

Frequently Asked Questions About This 1998 Astro PCM