Get Your GM Truck Running Right Again
Is your 1998-1999 Chevrolet Suburban 1500 giving you headaches? If you’re dealing with a persistent check engine light, erratic engine behavior, stalling, or a no-start condition that has you stumped, the Powertrain Control Module (PCM) is often the culprit. As the central computer for your engine and transmission, when it fails, it can cause a host of frustrating and difficult-to-diagnose problems. I’ve seen it countless times in my shop: a customer comes in after replacing multiple sensors, only to find the root cause was the PCM itself.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take a reliable, tested OEM computer and flash it with the latest GM-certified software specifically for your vehicle. By providing us with your Vehicle Identification Number (VIN) at checkout, you ensure this module arrives at your door perfectly matched to your truck’s original specifications. This critical step eliminates the need for an expensive trip to the dealership for programming, saving you time and money and getting you back on the road faster.
Case Study: A Tricky Diagnosis
I remember a ’99 Tahoe that came into the bay with a bizarre intermittent no-start condition. It would run perfectly for days, then refuse to crank. The owner had already replaced the battery, starter, and ignition switch. We checked all the grounds and power feeds to the PCM, which all looked good. On a hunch, we connected our diagnostic tool and noticed that when the no-start occurred, we’d lose communication with the PCM entirely. After swapping in a pre-programmed PCM like this one, the problem vanished. The internal board on the original unit had a micro-fracture that would separate when it cooled down, cutting power internally. It’s a classic failure mode for these older modules.
Is Your Suburban Showing These Signs?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, this module is the likely solution:
- ✔ Check Engine Light is on with communication error codes like P0601, P0605, or P0606.
- ✔ Vehicle will not start or is difficult to start.
- ✔ Stalling or rough idling for no apparent reason.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass an emissions inspection.
- ✔ Seemingly random sensor codes that don’t resolve after replacing the sensor.
A Straightforward Guide to Installation
Installing your programmed 1998-1999 Suburban 1500 PCM is a job most DIYers can handle in under an hour with basic hand tools. Our pre-programming makes it a direct-fit replacement.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most of these trucks and SUVs, the PCM is located in the engine bay, typically on the driver’s side inner fender or near the firewall.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old PCM. There are usually several multi-pin connectors with locking tabs. Do not force them.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware as you will need it for the new unit.
- Install the New PCM: Mount the new, pre-programmed PCM onto the bracket and secure it with the original hardware.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn: You will need to perform the GM Security Relearn Procedure. This simple process involves turning the key to ‘ON’ for 10-15 minutes, then ‘OFF’, and repeating two more times. This allows your vehicle’s anti-theft system to recognize the new PCM. Your truck will then start and run correctly.
Verified Vehicle Compatibility
This module is a direct replacement for service number 16250279 and will also fit vehicles requiring part numbers 09355699, 16266645, 16258815, and 09366810. It is compatible with a wide range of GM trucks and vans. Please verify your vehicle is on the list below and that your original module carries the ID 9355699.
SUBURBAN 1500/2500 (1998-1999)
TAHOE/YUKON (1998-1999)
ESCALADE (1999)
EXPRESS/SAVANA 1500/2500/3500 VAN (1998-1999)
ASTRO/SAFARI VAN (1998)
BLAZER S10/JIMMY S15 (1998)
S10/S15/SONOMA (1998)
BRAVADA (1998)
ENVOY (1998)
ISUZU HOMBRE (1998)
*Fitment depends on specific options and engine type. Always match the ID number (9355699) from your original module.