Restore Your Vehicle’s Brain and Get Back on the Road
Is your truck or SUV experiencing frustrating issues like a no-start condition, a persistent check engine light, or erratic engine behavior? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that manages your engine’s performance. This isn’t just an inconvenience; it can leave you stranded. This genuine OEM engine computer, part number 9355699, is the reliable, cost-effective solution you need. We take the guesswork and extra expense out of the repair by programming the module to your vehicle’s specific VIN before it ships. This ensures it works seamlessly with your existing systems right out of the box.
A Technician’s Notebook: The Ghost in the Machine
I remember a 1998 GMC Jimmy that came into my bay with a complaint that stumped two other shops. It would randomly stall and refuse to restart for hours. There were no consistent trouble codes, just a ‘no communication’ error with the scan tool when the problem occurred. We checked all the usual suspects—power, grounds, and the CAN bus wiring. Everything tested fine. From experience with hundreds of these GM platforms, I know that the internal processors on these older PCMs can fail intermittently due to heat cycles and age. We swapped in a known-good, programmed PCM like this one, and the problem vanished instantly. The customer went from considering selling the truck to having his reliable daily driver back. This part solves those phantom problems that are otherwise impossible to pin down.
Is Your Truck Exhibiting These Failure Signs?
A faulty PCM can cause a wide range of symptoms. If you’re noticing any of the following, it’s a strong indicator that your engine computer needs replacement:
- ✔ Check Engine Light is on with communication-related Diagnostic Trouble Codes (DTCs) like P0601, P0605, or U-series codes.
- ✔ The engine cranks but will not start.
- ✔ Poor or erratic automatic transmission shifting.
- ✔ A significant, unexplained drop in fuel economy.
- ✔ Rough idling, stalling, or hesitation during acceleration.
- ✔ The anti-theft or security light stays on, preventing the engine from starting.
A Straightforward Guide to Installation
Replacing the PCM on these vehicles is a job most DIYers can handle. Since we program the unit beforehand, you won’t need a trip to the dealer. Just follow these basic steps:
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most of these trucks and vans, the PCM is located in the engine compartment, often on the driver’s side fender or near the battery.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old PCM. They have locking tabs that need to be released before pulling. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Bolt your new, pre-programmed PCM into place and securely reconnect the wiring harnesses. You should hear a ‘click’ as they lock in.
- Reconnect the Battery: Reattach the negative battery terminal.
- Perform Security Relearn: In many cases, you will 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 your vehicle’s anti-theft system to recognize the new PCM.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM trucks and SUVs. Please verify your original part number matches one of the following: 09355699, 16266645, 16250279, 16258815, 09366810, or 9366810. This unit is confirmed to fit the following vehicles with service ID 9355699:
Fits various 1998-1999 models including Chevrolet/GMC Pickups (1500, 2500, 3500), Suburban, Tahoe, Yukon, Express/Savana Vans, S10/S15/Sonoma, Blazer/Jimmy, as well as the Oldsmobile Bravada, Cadillac Escalade, Isuzu Hombre, and more. Please use the compatibility chart or contact us with your VIN to confirm fitment.
Why do you need my VIN?
We require your Vehicle Identification Number (VIN) to program the PCM with your vehicle’s exact software and calibration files from GM. This ensures perfect compatibility with your engine, transmission, and options, making the installation plug-and-play.
Is this a new part?
No, this is a high-quality, tested, and guaranteed used OEM part sourced from a salvaged vehicle. We find OEM parts to be more reliable and a better value than many aftermarket alternatives.
Will I need to do anything after installation?
After physically installing the module, you will likely need to perform a simple ‘Security Relearn Procedure’ to sync the PCM with your vehicle’s anti-theft system. This process takes about 30 minutes and does not require any special tools.
What if my part number is slightly different?
This module replaces several part numbers, including 16266645, 16250279, and others listed in the description. As long as your original module carries one of these numbers, this part will work correctly.
What’s the benefit of getting a pre-programmed module?
The main benefit is saving time and money. A dealership can charge $100-$200 or more just for programming. Our service includes programming, so you receive a part that’s ready for installation without any extra trips or hidden fees.