Is Your Late 90s GM Truck or Van Running Rough?
If you’re dealing with a frustrating no-start condition, a persistent check engine light, poor fuel economy, or erratic engine behavior in your 1998-1999 GM vehicle, a failing Powertrain Control Module (PCM) is often the culprit. Over my 20+ years in the shop, I’ve seen countless GMT400 and Express/Savana platforms sidelined by these exact issues. The PCM is the brain of your engine, and when it starts to fail, it can cause a cascade of problems that are difficult to diagnose.
This isn’t just a replacement part; it’s a direct solution. We are offering a reliable, used OEM Powertrain Control Module that comes professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN). This means it arrives at your door ready for a straightforward installation, loaded with the latest GM software updates to ensure optimal performance and reliability.
Your Direct Solution for Common PCM Failures
A faulty PCM can manifest in many ways. If you’re experiencing any of the following, this module is the likely fix you’ve been looking for:
- โ Complete no-start or intermittent starting problems.
- โ Check Engine Light (CEL) is on with various communication or sensor codes.
- โ Poor or declining fuel mileage.
- โ The engine stalls unexpectedly while driving or at idle.
- โ Failed emissions or smog test.
- โ Harsh or incorrect automatic transmission shifting.
Expert Pro Tip from a 20-Year Veteran Mechanic
Before you condemn your old PCM, take a moment to inspect the main connector harnesses. On these GM trucks and vans, the PCM is often located in the engine bay where it’s exposed to heat and moisture. I’ve seen cases where simply cleaning the connector pins with a quality electronics cleaner and ensuring the connector seals are intact has resolved intermittent communication issues. It’s a 5-minute check that can save you a lot of diagnostic headaches. If the connections are clean and tight and the problem persists, the PCM itself is the next logical step.
Why Choose Our VIN-Programmed 1998-1999 Chevrolet 1500 PCM?
Forget the hassle and high cost of a dealership visit. A new computer from the dealer requires towing your vehicle in for expensive programming. Our service eliminates that step entirely. By providing us with your VIN during checkout, we handle all the programming for you. This used OEM unit is sourced from a salvaged vehicle, inspected for quality, and then flashed with the correct software for your exact make, model, and engine configuration. It’s the most efficient and cost-effective way to get your truck or van back in top running condition.
Plug-and-Play Installation: No Dealer Visit Required
Installing your programmed PCM is a job most DIY mechanics can handle in under an hour with basic tools. Follow these steps for a smooth installation:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes for any residual power to dissipate.
- Locate the PCM: On most 1998-1999 GM trucks and vans (like the Chevrolet 1500, Tahoe, Suburban, and Express), the PCM is located in the engine compartment, typically on the driver’s side fender well or near the battery.
- Disconnect the Harnesses: Carefully release the locking tabs and disconnect all electrical connectors from the old module. Inspect them for any corrosion or damage.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely reconnect all the electrical harnesses. You should hear a ‘click’ as they lock into place.
- Reconnect the Battery: Re-attach the negative battery terminal. Your vehicle is now ready to start. A security relearn procedure may be required on some models, which typically involves cycling the key.
This module is a direct replacement for part numbers 09355699, 16266645, 16250279, 16258815, and 09366810. Please verify the part number on your original module and consult our detailed fitment list to ensure compatibility.