Is Your GM Truck or Van Acting Up? Get Back on the Road with Confidence.
If your 1998-1999 Suburban 2500 is suffering from frustrating issues like a persistent check engine light, erratic shifting, a no-start condition, or poor fuel economy, a failing Powertrain Control Module (PCM) is often the culprit. I’ve seen it hundreds of times in my shop: these reliable workhorses start showing their age, and the brain of the operation gives out. This isn’t just an inconvenience; it’s a problem that can leave you stranded. This genuine, used OEM PCM is your direct, cost-effective solution to restore your vehicle’s performance and reliability.
The Simple, No-Hassle Solution: Programmed & Ready to Install
Forget expensive dealership visits and the headache of finding someone to program a new module. We handle the critical step for you. Before this PCM leaves our facility, we flash it with the latest official GM software updates, specifically matched to your vehicle using the VIN you provide. This ensures optimal performance, fuel efficiency, and transmission function, often correcting issues present in the original factory software.
Expert Pro Tip: Check Your Grounds First!
Before you condemn your PCM, take 10 minutes to check the main engine-to-chassis ground strap. On these GMT400 platform trucks, I’ve seen dozens of cases where a corroded or loose ground strap (often near the alternator or on the frame rail) causes bizarre electrical issues that perfectly mimic a failed PCM—like random stalling or flickering gauges. A simple cleaning with a wire brush can save you hundreds of dollars. It’s the first thing I check on any vehicle from this era.
Common Symptoms of a Failing 1998-1999 Suburban 2500 PCM:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Vehicle won’t start or starts intermittently
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Noticeable decrease in fuel mileage
- ✔ Engine stumbling, stalling, or running rough
- ✔ Communication error codes with a scan tool
- ✔ Failure to pass an emissions test
Plug-and-Play Installation: No Dealer Visit Required
Installing this module is a straightforward job you can do in your own driveway. While a security relearn procedure may be necessary on some models (a simple process we can guide you through), no advanced tools are required. Follow these steps for a successful replacement:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most Suburbans and pickups of this generation, the PCM is located in the engine bay on the driver’s side, near the fender or firewall.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors. Inspect them for any green corrosion or bent pins—clean them if necessary.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New PCM: Bolt your new, pre-programmed PCM into place and securely reconnect the wiring harnesses.
- Reconnect the 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, then start the vehicle. This allows the vehicle’s security system to sync with the new PCM.
Guaranteed Compatibility
This unit is a direct replacement for a wide range of GM vehicles from this era. If your original module has one of the following part numbers, this is the correct part for you:
Part Numbers: 09355699, 16266645, 16250279, 16258815, 09366810
This module is compatible with dozens of models, including the Chevrolet Tahoe, GMC Yukon, Express/Savana Vans, S10/Blazer, and Cadillac Escalade. By providing your VIN, you guarantee we send a perfectly matched and programmed computer for your specific application.