Restore Peak Performance to Your GM Truck or Van
Is your Chevrolet Express, GMC Savana, or another trusty GM vehicle from the late ’90s suddenly giving you headaches? If you’re dealing with a persistent check engine light, unexplained stalling, poor fuel mileage, or a frustrating no-start condition, the problem often points directly to a failing Powertrain Control Module (PCM). As a technician with over two decades of experience under the hood, I’ve seen how a faulty PCM can turn a reliable workhorse into a source of constant frustration. This isn’t just an inconvenience; it affects your work, your safety, and your wallet.
This is your straightforward, reliable solution. We are offering a genuine, used OEM Powertrain Control Module (service number 09355699) that has been meticulously tested and is ready for installation. The best part? We take care of the most critical step for you. Before this module ships, we will program it with the latest official GM software, specifically matched to your vehicle’s unique Vehicle Identification Number (VIN). This eliminates the need for an expensive trip to the dealership and ensures your vehicle operates exactly as the manufacturer intended, with all factory-issued drivability improvements included.
Case Study: A Tricky Diagnosis
I remember a 1998 Chevy C1500 that came into the bay on a tow truck. The owner said it just wouldn’t start one morning. We had spark, but the fuel pump wasn’t priming. We checked the fuse and relay—both were good. Power was going to the relay, but the PCM wasn’t providing the ground signal to activate it. After hooking up a high-level scanner, we confirmed the PCM’s fuel pump driver circuit had failed internally. It’s a classic failure mode on these units. We installed a VIN-programmed PCM just like this one, and the truck fired right up on the first turn of the key. It’s a simple swap that solves a complex electronic problem.
Is Your GM Truck or Van Showing These Symptoms?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, this module is likely the fix you need:
- ✔ Persistent Check Engine Light (CEL) with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0605 (Internal Control Module Read Only Memory (ROM) Error).
- ✔ Vehicle refuses to start or has intermittent starting problems.
- ✔ Rough or erratic engine idling.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or unpredictable automatic transmission shifting.
- ✔ Engine stalling for no apparent reason while driving or at a stop.
- ✔ Failure to pass an emissions or smog test.
A Straightforward Guide to Installation
One of the biggest benefits of our service is the plug-and-play convenience. While professional installation is always an option, this is a job many DIY mechanics can handle in their own driveway. Here are the general steps:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental reconnection.
- Locate the PCM: On most of these GM trucks and vans, the PCM is located in the engine compartment, typically on the driver’s side fender well or near the battery.
- Disconnect the Old Unit: Carefully unplug the electrical harness connectors from the old PCM. These connectors have locking tabs that may need to be gently pried or squeezed to release.
- Remove the Old PCM: Unbolt the module from its mounting bracket. Keep the hardware, as you may need it for the new installation.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely plug in the harness connectors. You should hear a ‘click’ as they lock into place.
- Reconnect and Start: Reconnect the negative battery terminal. In some cases, a simple security relearn procedure may be needed, which typically involves turning the key to the ‘On’ position for 10-15 minutes. Start the engine and enjoy your smooth-running vehicle!
Verified Vehicle Compatibility List
This module, identified by part number 09355699, serves as a direct replacement for a wide range of General Motors vehicles. It is interchangeable with part numbers 16266645, 16250279, 16258815, 09366810, and more. To guarantee compatibility, please verify that the service number on your current PCM matches one of these numbers. This part fits many models, including but not limited to:
- ✔ 1998-1999 Chevrolet & GMC C/K 1500, 2500, 3500 Pickups
- ✔ 1998-1999 Chevrolet Suburban & Tahoe
- ✔ 1998-1999 GMC Yukon
- ✔ 1998-1999 Chevrolet Express & GMC Savana Vans (1500, 2500, 3500)
- ✔ 1999 Cadillac Escalade
- ✔ 1998 Chevrolet Astro & GMC Safari
- ✔ 1998 Chevrolet S10, GMC Sonoma, Oldsmobile Bravada, Isuzu Hombre (4.3L)
No. This is the primary benefit of our service. We program the module to your vehicle’s VIN before we ship it. It arrives ready to install. In rare cases, a simple ‘Security Relearn’ procedure may be necessary, but this does not require any special tools.
After you complete your purchase, simply send us a message with your vehicle’s 17-digit VIN. We cannot process and ship your order until we receive this information.
No, this is a high-quality, tested, and fully functional used OEM part sourced from a salvaged vehicle. This allows us to provide a reliable, factory-correct part at an affordable price.
You’re in luck. This module is a direct replacement for several part numbers, including 16266645. As long as your original part number is on our interchange list, this module will fit and function correctly in your vehicle.
A standard junkyard PCM is not programmed for your specific vehicle and will not work correctly without being flashed by a dealer or a high-end shop, which is costly. Our module is tested, guaranteed to work, and comes pre-programmed with the latest GM software for your VIN, saving you time, money, and hassle.