Restore Peak Performance to Your GM Truck or Van
Is your trusty GMC Safari, Chevy Express, or Silverado suddenly giving you trouble? Issues like a no-start condition, erratic engine behavior, or a persistent Check Engine Light can often be traced back to a failing Powertrain Control Module (PCM). As a technician with over two decades of experience, I’ve seen how a faulty engine computer can bring an otherwise solid vehicle to a dead stop. This isn’t just an inconvenience; it’s a frustrating problem that needs a reliable solution. That’s exactly what this pre-programmed PCM offers—a dependable and straightforward fix to get you back on the road with confidence.
A Technician’s Notebook: The Phantom No-Communication Fault
A 1999 Chevy Suburban was towed into my bay with a classic complaint: “It cranks but won’t start.” The owner had already replaced the fuel pump and crank sensor. My scan tool, however, couldn’t communicate with the PCM. This is a huge red flag. Instead of guessing, I went straight to the source. After verifying power and ground at the PCM connectors, it was clear the module itself was internally failed. These older GM PCMs are robust, but after 20+ years, internal solder joints and capacitors can fail, severing communication. We installed a VIN-programmed module just like this one, performed the security relearn, and the truck fired up on the first try. This part solved a problem that had already cost the owner hundreds in unnecessary parts.
Is Your GM Truck or Van Showing These Signs?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, this module is the likely solution.
- ✔ Complete no-start or intermittent starting issues
- ✔ Check Engine Light is on with communication error codes (like U0100) or internal processor fault codes (P0601, P0605)
- ✔ Poor fuel economy and engine performance
- ✔ Harsh or incorrect automatic transmission shifting
- ✔ The engine stalls unexpectedly while driving or at idle
- ✔ Your scan tool cannot communicate with the engine computer
A Straightforward Guide to Installation
One of the biggest benefits of this PCM is that it arrives programmed to your vehicle’s VIN, simplifying the installation process. While professional installation is always an option, a confident DIYer can handle this job.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes for capacitors to discharge before beginning.
- 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 Module: Carefully unplug the electrical connectors. These usually have a locking tab or lever that needs to be released. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the replacement PCM into place and securely reconnect all electrical harnesses. Ensure they click into place.
- Reconnect the Battery: Reattach the negative battery terminal.
- Perform Security Relearn (If Necessary): Some GM vehicles with Passlock/VATS security systems may require a relearn procedure to allow the vehicle to start. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating two more times. Consult a service manual for your specific vehicle’s procedure.
Verified Vehicle Compatibility
This module, identified by part number 09355699, is a direct replacement for a wide range of popular 1998 and 1999 GM vehicles. It also interchanges with part numbers 16266645, 16250279, 16258815, and 09366810. Please match your part number or vehicle from the list below to ensure proper fitment.
CHEVROLET 2500 PICKUP 98-99 (Gasoline)
CHEVROLET 3500 PICKUP 98-99 (Gasoline)
EXPRESS 1500/2500/3500 VAN 98-99 (Gasoline)
GMC 1500 PICKUP 98-99
GMC 2500 PICKUP 98-99 (Gasoline)
GMC 3500 PICKUP 98-99 (Gasoline)
SAVANA 1500/2500/3500 VAN 98-99 (Gasoline)
CADILLAC ESCALADE 99
CHEVROLET ASTRO 98
GMC SAFARI 98
CHEVROLET BLAZER S10 / GMC JIMMY S15 98 (4.3L)
OLDSMOBILE BRAVADA 98 (4.3L)
GMC ENVOY 98 (4.3L)
CHEVROLET S10 / GMC SONOMA 98 (4.3L)
ISUZU HOMBRE 98 (4.3L)
CHEVROLET SUBURBAN 1500/2500 98-99 (Gasoline)
CHEVROLET TAHOE 98-99 (Gasoline)
GMC YUKON 98-99 (Gasoline)
Note: Please verify the ID 09355699 on your original part.
Frequently Asked Questions
Frequently Asked Questions
What exactly does a PCM do?
The Powertrain Control Module (PCM) is the main computer for your vehicle. It controls all essential engine and transmission functions, including fuel mixture, ignition timing, and shift points, to ensure optimal performance and efficiency.
How do I provide my VIN for programming?
After you complete your purchase, simply send us a message with your vehicle’s 17-digit Vehicle Identification Number (VIN). We will program the module with the latest GM software for your specific vehicle before we ship it.
Will I need to do anything else after installing this part?
Because this PCM comes pre-programmed, it’s designed to be a straightforward installation. However, some GM vehicles may require a simple security relearn procedure, which can typically be done without any special tools. We recommend checking your vehicle’s service manual for specific instructions.
Is this a new part?
No, this is a high-quality, tested used OEM part that has been sourced from a salvaged vehicle. Each unit is inspected and then programmed to ensure it functions correctly, offering a reliable and economical alternative to a costly new dealer part.
My original part number is 16266645. Will this work?
Yes. This PCM, part number 09355699, is a direct, compatible replacement for several part numbers, including 16266645, 16250279, 16258815, and 09366810. As long as your vehicle is on our compatibility list, this module will fit and function correctly.