Get Your GM Truck Running Right Again
If you’re dealing with a frustrating no-start condition, erratic engine performance, or a check engine light that won’t go away on your 1998-1999 GM truck or van, a failing Powertrain Control Module (PCM) is often the culprit. After 20+ years in the bay, I’ve seen how a faulty computer can cause mechanics and DIYers to chase their tails, replacing perfectly good sensors. This tested, reliable OEM PCM is the direct solution to get your vehicle back on the road with confidence.
This isn’t just a used part pulled from a yard. We take a quality, salvaged OEM unit and program it specifically for your vehicle using your VIN. This means it arrives with the latest official GM software updates, addressing common drivability concerns and ensuring optimal engine and transmission performance. By providing us with your VIN at checkout, you get a module that’s ready for installation, saving you a trip to the dealership and their expensive programming fees. This is the smart, efficient fix for your 1998-1999 Chevrolet 1500 PCM problems.
Case Study: A Tricky Diagnosis
I remember a ’99 GMC Sierra 5.7L that came into my shop with an intermittent stalling problem that no one could figure out. The owner had already replaced the fuel pump and ignition control module. Scans showed no consistent codes, just random communication errors. Experience told me to look at the PCM. After swapping in a known-good, programmed module like this one, the truck ran perfectly. The original PCM had internal board fractures from years of heat and vibration that only caused issues when warm. This single part saved the customer hundreds more in diagnostic fees and unnecessary parts.
Is Your Truck’s Brain Failing?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, it’s time to consider a replacement:
- ✔ Check Engine Light is on with codes like P0601, P0604, or P0606 (Internal Control Module Errors)
- ✔ Vehicle will not start or is very hard to start
- ✔ Poor or erratic automatic transmission shifting
- ✔ Random engine stalling or stumbling
- ✔ Noticeable drop in fuel economy
- ✔ Communication issues with your scan tool
A Straightforward Guide to Installation
Installing your new PCM is a manageable job for a DIYer with basic tools. While a CASE Relearn procedure with a capable scan tool is recommended for optimal performance, the vehicle will typically start and run without it. Always consult a service manual for your specific vehicle.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most of these trucks and vans, the PCM is located in the engine compartment, typically on the driver’s side fender well.
- Disconnect Connectors: Carefully unclip and remove the electrical harness connectors from the old PCM. Inspect them for any corrosion or damage.
- Remove Old Unit: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install New Unit: Mount your new, pre-programmed PCM into the bracket and securely re-attach the electrical connectors.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn (if needed): Turn the key to the ‘ON’ position for 10-15 minutes, then off for 10 seconds. Repeat this cycle three times to allow the vehicle’s security system to recognize the new PCM. The vehicle should now start.
Verified Vehicle Compatibility
This module, identified by service number 16250279 or Hollander ID 590-05202 (which corresponds to ID 9355699), is a direct replacement for a wide range of GM vehicles. It is compatible with the following part numbers: 09355699, 16266645, 16258815, and 09366810. Please verify your part number or contact us with your VIN to confirm fitment.
- ✔ Chevrolet/GMC C/K 1500, 2500, 3500 Pickups (1998-1999)
- ✔ Chevrolet Tahoe & GMC Yukon (1998-1999)
- ✔ Chevrolet & GMC Suburban (1998-1999)
- ✔ Cadillac Escalade (1999)
- ✔ Chevrolet Express & GMC Savana Vans (1998-1999)
- ✔ Chevrolet Astro & GMC Safari Vans (1998)
- ✔ Oldsmobile Bravada (1998)
- ✔ Chevrolet S10, GMC Sonoma, Isuzu Hombre (1998)
- ✔ Chevrolet Blazer, GMC Jimmy, GMC Envoy (1998)
Why do I need to provide my VIN?
Your Vehicle Identification Number (VIN) is essential for us to program the PCM with the correct software and calibrations for your truck’s specific engine, transmission, and options. This ensures it works correctly right out of the box.
Is this part new?
No, this is a high-quality, tested computer that was sourced from a salvaged vehicle. Each unit is inspected and verified to be fully functional before being programmed and shipped.
Will I need to do anything after installation?
In most cases, the vehicle will start and run after the simple key-cycle security relearn. For optimal performance and to clear certain codes, a Crankshaft Variation (CASE) Relearn procedure is recommended using a professional scan tool. Many local repair shops can perform this service.
Does this fix transmission shifting problems?
Yes, the PCM controls both engine and transmission functions. If your hard or erratic shifting is caused by a faulty computer, this part is the correct solution.
What if my part number is slightly different?
This PCM is a direct replacement for several part numbers, including 09355699, 16266645, and others listed. As long as your vehicle is on the compatibility list, this module will function correctly once programmed to your VIN.