Restore Your Vehicle’s Brain and Get Back on the Road
As a technician with over two decades of experience under the hood, I’ve seen countless drivers frustrated by mysterious engine problems. Stalling, poor fuel mileage, erratic shifting, or a persistent Check Engine Light can often be traced back to one critical component: the Powertrain Control Module (PCM). This isn’t just another part; it’s the central computer managing everything from your engine’s fuel mixture to your transmission’s shift points. When it fails, your vehicle’s performance and reliability suffer dramatically.
This is a reliable, tested, and VIN-programmed PCM, service number 9355699, for a wide range of late-90s GM trucks and vans. We take the guesswork and hassle out of the replacement process. Instead of paying steep dealership prices and extra programming fees, you get a cost-effective solution that arrives ready for installation. Simply provide your vehicle’s VIN at checkout, and our experts will flash this module with the latest GM software updates specific to your vehicle. This ensures seamless communication with your vehicle’s other systems and restores original factory performance.
A Technician’s Notebook
I remember a 1999 Chevy Suburban that came into the shop with a laundry list of complaints: intermittent no-start, rough idle, and the transmission would occasionally get stuck in gear. The owner had already replaced the fuel pump and multiple sensors, chasing what seemed like a ghost. After hooking up the scan tool, I saw a P0601 code (Internal Control Module Memory Check Sum Error). This is a dead giveaway. The PCM’s internal memory was corrupted. We installed a VIN-programmed module just like this one, and the truck ran like it just rolled off the assembly line. It’s a reminder that sometimes the most complex problems have a straightforward, central solution.
Is Your Truck or Van Showing These Symptoms?
A failing PCM can cause a wide array of issues that can be mistaken for other component failures. If you’re experiencing any of the following, your engine computer could be the culprit:
- ✔ Check Engine Light is on with codes like P0601, P0602, P0604, or P0606.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drop in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine stalling, sputtering, or misfiring.
- ✔ Communication errors with your scan tool.
A Straightforward Guide to Your PCM Installation
Installing your replacement 1998 Bravada PCM is a job most DIYers can handle with basic tools. Following the correct procedure is key to a successful repair.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes to allow capacitors to discharge.
- Locate the PCM: On most of these GM vehicles, the PCM is located in the engine compartment, often on the driver’s side fender well or near the battery. Refer to your vehicle’s service manual for the exact location.
- Disconnect the Harnesses: Carefully unplug the electrical connectors from the old PCM. These connectors have locking tabs that must be released. Do not force them.
- Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely bolt it in place.
- Reconnect Everything: Plug the wiring harnesses back into the new module, ensuring they click securely into place. Reconnect the negative battery terminal.
- Security Relearn (If Necessary): In many cases, the vehicle will start and run perfectly. However, some GM vehicles may require a simple security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Consult your service manual for the specific procedure for your model.
Verified Vehicle Compatibility List
This PCM is a direct fit for vehicles requiring service number 9355699 or one of its interchangeable part numbers (16266645, 16250279, 16258815, 09366810, 9366810). Please match your part number and verify your vehicle is on the list below to ensure proper fitment.
CHEVROLET 2500 PICKUP 98-99 (Gasoline)
CHEVROLET 3500 PICKUP 98-99 (Gasoline)
GMC 1500 PICKUP 98-99 (Gasoline)
GMC 2500 PICKUP 98-99 (Gasoline)
GMC 3500 PICKUP 98-99 (Gasoline)
ASTRO 98
BLAZER S10/JIMMY S15 98 (w/o build date opt ZN4)
BRAVADA 98 (4.3L, w/o build date opt ZN4) – The perfect 1998 Bravada PCM replacement.
ENVOY 98 (w/o build date opt ZN4)
ESCALADE 99
EXPRESS/SAVANA 1500 VAN 98-99
EXPRESS/SAVANA 2500 VAN 98-99 (Gasoline)
EXPRESS/SAVANA 3500 VAN 98-99 (Gasoline)
ISUZU HOMBRE 98 (4.3L, w/o extended build date opt ZN4)
S10/S15/SONOMA 98 (4.3L, w/o build date opt ZN4)
SAFARI (GMC) 98
SUBURBAN 1500/2500 98-99 (Gasoline)
TAHOE/YUKON 98-99 (Gasoline)
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the PCM with the exact software and calibrations your specific vehicle requires. This ensures proper engine and transmission function, and compatibility with options like your engine size and security system.
Is this part difficult to install?
No, for most individuals with basic mechanical skills, this is a straightforward replacement. It’s typically held in by a few bolts and has several easy-to-remove electrical connectors. Our installation guide above provides the general steps.
What does ‘used’ condition mean for this part?
This PCM is a genuine OEM part carefully recovered from a salvaged vehicle. Each unit is inspected and tested to ensure it is fully functional before being programmed and shipped. It’s a reliable and affordable alternative to a new dealer part.
Will I need to do any additional programming?
No. This PCM comes pre-programmed to your VIN. In most cases, it is a plug-and-play installation. Some vehicles may require a simple security relearn procedure that does not require any special tools.
Does this fix a P0601 Check Engine Light code?
Yes, a P0601 code indicates an internal memory failure within the PCM itself. Replacing the module is the correct and definitive repair for this specific diagnostic trouble code.