Get Your GM Van or Truck Running Right Again
If you’re dealing with frustrating issues like intermittent stalling, a persistent check engine light, or a vehicle that just won’t start, a faulty Powertrain Control Module (PCM) is often the culprit. As the ‘brain’ of your vehicle, the PCM controls everything from fuel mixture and spark timing to transmission shifting. When it fails, it can cause a host of problems that are difficult to diagnose. This is a reliable, tested, and pre-programmed replacement PCM for a wide range of 1998-1999 GM vehicles, including the Chevrolet Express 1500 van.
Forget the expensive trip to the dealership. We take the hassle out of the repair by programming this module specifically for your vehicle using your VIN. This ensures it has the latest GM software updates and is ready for installation right out of the box. It’s the straightforward, cost-effective solution to get your workhorse back on the road.
A Technician’s Notebook: The Intermittent No-Start
I once had a 1999 Suburban in my bay that was driving the owner crazy. It would run perfectly for weeks, then suddenly refuse to start. No spark, no fuel injector pulse. After hours of chasing wires and testing sensors, we found the PCM was intermittently failing its internal self-check, but only when it was hot. These older GM units are tough, but heat cycles over 20+ years can cause internal solder joints to crack. Replacing the PCM with a solid, tested unit like this one solved the problem instantly. It’s a classic failure mode I’ve seen dozens of times on these trucks and vans.
Is Your GM Vehicle Showing These Symptoms?
- ✔ Unexplained Check Engine Light (CEL)
- ✔ Vehicle refuses to start or stalls unexpectedly
- ✔ Poor engine performance or decreased fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Failure to communicate with a diagnostic scan tool
- ✔ Stored diagnostic trouble codes (DTCs) such as P0601, P0605, or P0606
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
- ✔ 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 Harnesses: Carefully unclip and remove the electrical wiring harnesses connected to the old PCM. The connectors have locking tabs that need to be released. Avoid pulling on the wires themselves.
- ✔ Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware as you will need it to install the new unit.
- ✔ Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely connect the wiring harnesses. You should hear a ‘click’ as they lock into place.
- ✔ Reconnect the Battery: Re-attach the negative battery terminal.
- ✔ Perform Security Relearn (If Needed): In many cases, you will need to perform a simple security relearn procedure. Typically, this involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. Your vehicle’s service manual will have the exact procedure.
Will This Fit My Truck or Van?
This PCM is a direct replacement for service number 09366810 and is compatible with several other part numbers including 09355699, 16266645, 16250279, and 16258815. It fits a wide variety of GM models. Please verify your vehicle is on the list below and that the service ID on your original module matches. This module fits the following vehicles with ID 9355699:
CHEVROLET 2500 PICKUP 98-99 (Gasoline)
CHEVROLET 3500 PICKUP 98-99 (Gasoline)
EXPRESS 1500 VAN 98-99
EXPRESS 2500 VAN 98-99 (Gasoline)
EXPRESS 3500 VAN 98-99 (Gasoline)
SUBURBAN 1500 98-99 (Gasoline)
SUBURBAN 2500 98-99 (Gasoline)
TAHOE 98-99 (Gasoline)
ASTRO 98
BLAZER S10 98 (w/o build date opt ZN4)
S10/S15/SONOMA 98 (4.3L, w/o build date opt ZN4)
GMC 1500 PICKUP 98-99 (Gasoline)
GMC 2500 PICKUP 98-99 (Gasoline)
GMC 3500 PICKUP 98-99 (Gasoline)
SAVANA 1500 VAN 98-99
SAVANA 2500 VAN 98-99 (Gasoline)
SAVANA 3500 VAN 98-99 (Gasoline)
YUKON 98-99
SAFARI (GMC) 98
JIMMY S15 98 (w/o build date opt ZN4)
BRAVADA 98 (w/o build date opt ZN4)
ENVOY 98 (w/o build date opt ZN4)
ESCALADE 99
ISUZU HOMBRE 98 (4.3L, w/o build date opt ZN4)
Why do I need to provide my VIN?
Why do I need to provide my VIN?
Your Vehicle Identification Number (VIN) is essential for us to program the PCM correctly. It allows us to load the exact GM-specified software for your vehicle’s engine, transmission, and factory options. This ensures perfect compatibility and function without a trip to the dealer.
Is this a new part?
No, this is a high-quality, tested used part sourced from a salvaged vehicle. Each unit is inspected and verified to be fully functional before being programmed and shipped. This provides a reliable, affordable alternative to a new dealership part.
Will I need to do anything else after installing it?
In many cases, you will need to perform a security relearn procedure, also known as a VATS relearn. This is a simple process that syncs the new PCM with your vehicle’s anti-theft system and typically does not require special tools. We include general instructions, but you can also find vehicle-specific steps online or in a service manual.
How do I find my original part number?
Your original part number or service number is printed on a sticker on the PCM itself. You will need to locate the module in your engine bay to physically inspect it. This replacement is compatible with multiple part numbers, including 09366810 and 09355699.