Is Your 1998-1999 GM Truck or Van Running Rough?
If your Tahoe, Suburban, or Express Van is experiencing frustrating issues like stalling, erratic shifting, a persistent check engine light, or even a complete no-start condition, the problem often points directly to a failing Powertrain Control Module (PCM). As the brain of your vehicle, when the PCM starts to fail, it can create a cascade of problems that are often misdiagnosed. I’ve seen countless customers in my shop spend hundreds on new fuel pumps or ignition components, only to find the root cause was the engine computer all along.
This isn’t just a replacement part; it’s a direct solution. We are offering a reliable, used OEM PCM that is fully tested and then professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN). This ensures all factory settings and the latest GM software updates are loaded, restoring the precise control your engine and transmission need to operate correctly.
Common Symptoms of a Failing GM PCM:
- โ No-start or intermittent starting problems
- โ Check Engine Light is on with various communication or sensor codes
- โ Harsh or incorrect automatic transmission shifting
- โ Poor fuel economy and engine performance
- โ Stalling for no apparent reason
- โ Failure to pass an emissions test
From the Shop Floor: A Real-World Scenario
“A customer’s ’99 Suburban came in last week with these exact symptomsโit would crank but not start, and when it did run, it shifted hard from 1st to 2nd. The owner had already replaced the fuel filter and was about to order a fuel pump. I hooked up my scan tool and couldn’t communicate with the PCM. After checking powers and grounds, it was clear the computer itself had failed internally. We installed one of our programmed PCMs, and the truck fired right up and shifted perfectly. It’s a classic issue on these GMT400 platforms that a good diagnostic process can pinpoint every time.”
Easy Installation for the DIY Mechanic
Replacing the PCM on these trucks is a straightforward job you can do in your own driveway. Because we program the module before shipping, you won’t need a costly trip to the dealership for additional programming. Just follow these simple steps:
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most of these trucks and vans, it’s located in the engine compartment on the driver’s side, near the fender or firewall.
- Disconnect the Harnesses: Carefully unclip and remove the electrical connectors from the old PCM.
- Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New PCM: Bolt your new, pre-programmed PCM into the bracket.
- Reconnect Everything: Firmly plug the electrical harnesses back into the new module and reconnect your battery terminal.
- Perform Security Relearn (If Needed): In some cases, a simple 10-minute security relearn procedure is required. Turn the key to the ‘ON’ position for 10 minutes, then ‘OFF’ for 10 seconds, and repeat two more times. Your truck should then start normally.
Guaranteed Compatibility for Your 1998-1999 Tahoe PCM
This module is a direct replacement for several part numbers, ensuring a perfect fit for a wide range of GM vehicles. Please verify that your original module has one of the following part numbers printed on its label:
Compatible Part Numbers: 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, 9366810
After your purchase, simply provide us with your vehicle’s 17-digit VIN. Our technicians will handle the programming, making this a true plug-and-play solution to get you back on the road with confidence.