Get Your GM Truck or Van Running Right Again
Is your 1998 GMC Safari, Chevy Astro, or another GM truck from that era giving you headaches? If you’re dealing with a persistent check engine light, stalling, rough idling, or a no-start condition that has you scratching your head, the Powertrain Control Module (PCM) could be the culprit. As a technician with over two decades of experience under the hood, I’ve seen countless sensors and parts get replaced when the vehicle’s computer was the root cause all along. This isn’t just a replacement part; it’s a direct solution to restore your vehicle’s reliability and performance.
This is a genuine, road-tested OEM Powertrain Control Module. We take the hassle out of the repair by programming it specifically for your vehicle using your VIN. This means it arrives at your door with the latest GM software updates already installed, saving you a costly trip to the dealership and the need for expensive proprietary scan tools. This is the smart, effective fix for both seasoned mechanics and determined DIYers.
A Technician’s Notebook
I remember a 1999 Chevy Suburban that came into the bay with an intermittent stalling issue that no one could figure out. The owner had already replaced the fuel pump and ignition control module. After connecting my scope, I found the injector driver circuit inside the original PCM was failing intermittently under heat. We installed a VIN-programmed PCM just like this one, and the truck ran perfectly. The problem wasn’t a bad sensor; it was the brain telling it what to do. This highlights why starting with a correctly programmed PCM is crucial for an accurate and lasting repair.
Is Your GM Vehicle Showing These Signs?
A failing PCM can manifest in various ways. If you’re experiencing any of the following, this module is the likely solution you need:
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0605 (Internal Control Module Read Only Memory (ROM) Error).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ The transmission shifts erratically or harshly.
- ✔ Stalling for no apparent reason, either while driving or at idle.
- ✔ Failure to pass an emissions test.
- ✔ Your scan tool cannot communicate with the PCM.
A Straightforward Guide to Installation
Installing your programmed PCM is a manageable job for a DIYer with basic tools. Here’s a general guide for a vehicle like a GMC Safari or Chevy Astro:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: On most of these vans and trucks, the PCM is located in the engine compartment, often on the driver’s side near the battery or on the fender wall.
- Disconnect the Harnesses: Carefully unclip and remove the electrical wiring harnesses connected to the old module. These connectors have locking tabs that need to be released gently.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware as you may need to reuse it.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely re-fasten the bolts.
- Reconnect Everything: Plug the wiring harnesses back into the new module until they click firmly into place. Reconnect your negative battery terminal.
- Final Step – Security Relearn: On many of these GM vehicles, you may need to perform a simple security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. This allows the BCM to recognize the new PCM. Your vehicle may not start until this is completed.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 09355699, 16266645, 16250279, 16258815, and 09366810. It is confirmed to fit a wide range of GM trucks and vans. Please verify your vehicle is on this list and that the ID on your original module is 9355699.
- ASTRO: 1998
- BLAZER S10/JIMMY S15: 1998 (w/o build date opt ZN4)
- BRAVADA: 1998 (w/o build date opt ZN4)
- CHEVROLET/GMC PICKUPS (1500/2500/3500): 1998-1999 (Gasoline)
- ESCALADE: 1999
- ENVOY: 1998 (w/o build date opt ZN4)
- EXPRESS/SAVANA VANS (1500/2500/3500): 1998-1999 (Gasoline)
- ISUZU HOMBRE: 1998 (4.3L, w/o extended build date opt ZN4)
- S10/S15/SONOMA: 1998 (4.3L, w/o build date opt ZN4)
- SUBURBAN (1500/2500): 1998-1999 (Gasoline)
- TAHOE/YUKON: 1998-1999 (Gasoline)
What do I need to do after I purchase?
What do I need to do after I purchase?
After you complete your purchase, you must send us your vehicle’s 17-digit VIN (Vehicle Identification Number). We cannot program and ship your module without it. You can typically find your VIN on your vehicle’s dashboard (visible through the windshield) or on the driver’s side door jamb sticker.
Is this a plug-and-play part?
Yes, for the most part. Because we program it to your VIN, it eliminates the need for dealer-level programming. However, as noted in the installation guide, you will likely need to perform a simple security relearn procedure, which takes about 30 minutes and requires no special tools.
Why choose a used OEM part over a new aftermarket one?
Original Equipment Manufacturer (OEM) parts are designed by the vehicle manufacturer to meet strict quality and durability standards. In my experience, a tested, used OEM electronic module is often more reliable than a new, unproven aftermarket part. You get factory-level performance and fitment at a much better price point.
Will this PCM fix my vehicle’s specific problem?
This module will correct any issues directly caused by a faulty PCM. While the symptoms we’ve listed are very common for PCM failure, we always recommend a proper diagnosis by a qualified mechanic to confirm the PCM is the part you need. This part will not fix problems related to other faulty components (e.g., a bad fuel pump or a broken wire).
What if my part number isn’t 09366810 but is on the interchange list?
That’s perfectly fine. Manufacturers use several part numbers for the same component over its production life. As long as your original part number is included in our compatibility list (e.g., 09355699, 16266645, etc.), this module will function as a direct replacement once programmed to your VIN.