Is Your Chevy Truck Stalling, Running Rough, or Refusing to Start?
If your 1998 or 1999 Chevrolet 1500 is giving you headaches with unpredictable performance, a persistent Check Engine Light, or frustrating electrical gremlins, the problem often points directly to a failing Powertrain Control Module (PCM). As the central computer of your truck, a faulty PCM can wreak havoc on everything from fuel economy to transmission shifting. Don’t keep throwing parts at the problem hoping for a fix.
From the Shop Floor: A Real-World Diagnosis
“A customer’s ’99 Silverado 1500 came in last week with a no-start condition and a fuel gauge that was reading empty, even with a full tank. They’d already replaced the fuel pump, thinking that was the issue. After a quick scan, I found no communication with the PCM. A simple check of the main power and ground circuits to the module showed they were good. This told me the internal circuitry of the PCM itself had failedโa common issue I’ve seen on hundreds of these GMT400 trucks due to heat cycles and age. This pre-programmed module is the exact, hassle-free fix for that scenario.”
The Direct Solution: A 1998-1999 Chevrolet 1500 PCM Programmed for You
This isn’t just a used part pulled from a shelf. This is a reliable, tested OEM PCM that we program specifically for your vehicle before it ever leaves our facility. By providing us with your Vehicle Identification Number (VIN), you receive a module that is truly plug-and-play. We load the latest GM factory software updates, which can resolve issues the original programming didn’t account for. This process restores your truck’s original performance and reliability without a mandatory, expensive trip to the dealership.
Key Symptoms of a Failing PCM:
- โ Persistent Check Engine Light (CEL) with various codes
- โ Vehicle won’t start or stalls intermittently
- โ Rough or erratic idling
- โ Poor acceleration and loss of power
- โ Decreased fuel efficiency
- โ Harsh or incorrect transmission shifting
- โ Communication errors with diagnostic scan tools
Simple, Straightforward Installation Guide
You can get your truck back on the road in under an hour with basic hand tools. No complex procedures are required.
- Safety First: Always disconnect the negative terminal from your truck’s battery.
- Locate the PCM: On most 1998-1999 GM trucks, the PCM is located in the engine compartment, typically on the driver’s side fender well.
- Disconnect Harnesses: Carefully unclip and remove the colored wiring harness connectors from the old module. Inspect the pins for any corrosion or damage.
- Remove Old Module: Unbolt the old PCM from its mounting bracket.
- Install New Module: Secure this programmed PCM onto the bracket.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new module until they click. Reconnect the negative battery terminal.
- Final Step: Turn the key to the ‘ON’ position for 10-15 seconds before starting the engine. This allows the other modules to recognize the new PCM. In some cases, a simple security relearn procedure may be necessary, which involves a few key cycles.
Guaranteed Compatibility
This module, part number 9366810, is a direct replacement for several service numbers. If your original module has one of the following numbers, this unit will work perfectly for your vehicle:
Interchangeable Part Numbers: 09355699, 16266645, 9355699, 16250279, 16258815, 09366810
This PCM fits a wide range of 1998-1999 GM trucks and vans, including the Chevrolet Silverado, Suburban, Tahoe, Express, GMC Sierra, Yukon, Savana, Cadillac Escalade, and more. Please verify the part number on your original module or consult the detailed fitment list to ensure compatibility.