Is Your 1998-1999 GM Truck or SUV Running Rough?
If you’re dealing with frustrating issues like a persistent check engine light, poor acceleration, erratic shifting, or even a no-start condition in your Chevrolet Suburban 2500, the root cause is often a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, the PCM’s health is critical for your vehicle’s performance, reliability, and fuel economy. When it begins to fail, it can create a cascade of problems that are often misdiagnosed, leading to expensive and unnecessary repairs on other components.
This replacement Powertrain Control Module, part number 09355699, is the definitive solution to restore your vehicle’s factory performance. Unlike generic modules that require expensive programming at a dealership, this unit arrives at your door fully programmed to your specific vehicle using your VIN. We install the latest GM-certified software updates, which can correct original factory flaws, improve transmission shifting logic, and enhance overall engine efficiency. This is a direct-fit, plug-and-play solution designed to get you back on the road quickly and confidently.
From the Diagnostic Bay
I remember a customer with a ’99 Tahoe who had spent nearly a thousand dollars chasing a ghost. His truck would randomly stall at stoplights and had a rough idle. He’d replaced the spark plugs, wires, throttle position sensor, and even the fuel pump based on advice from forums and a parts store scanner. The check engine light was intermittent. When he finally brought it to our shop, we connected a professional scan tool and monitored the live data. We saw erratic readings from multiple sensors and inconsistent injector pulse widths—all pointing back to the PCM. A new, properly programmed module solved every single one of his issues. It’s a classic case of treating the disease, not just the symptoms.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or misfiring.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A noticeable decrease in fuel economy.
- ✔ The vehicle fails to start, even with a good battery and starter.
- ✔ Failure to pass state emissions testing.
- ✔ Communication errors with diagnostic scan tools.
Why Choose Our Programmed 1998-1999 Suburban PCM?
Getting your truck back to peak condition shouldn’t be a hassle. Our process is designed for the DIY mechanic and professional alike. By providing us with your vehicle’s VIN during checkout, you ensure that the module you receive is a perfect match. The programming process accounts for your vehicle’s specific engine, transmission, and emissions equipment. This eliminates any guesswork and the need for additional dealer services. This module is a direct replacement for service numbers 16250279, 09366810, and 09355699, making it a versatile solution for a wide range of GM vehicles from this era, including the Tahoe, Yukon, C/K pickups, and Express/Savana vans.
Installation is Straightforward
Replacing the PCM is typically a simple process. It’s located in the engine compartment, usually on the driver’s side. After disconnecting the battery, you simply unplug the electrical connectors, unbolt the old module, and install the new one. Once installed and the battery is reconnected, you may need to perform a simple security relearn procedure, which involves cycling the key in the ignition. This procedure is detailed in many online resources and ensures the new PCM communicates correctly with your vehicle’s anti-theft system.
Frequently Asked Questions
Do I need to have this module programmed?
No. We handle all programming for you before shipment. Simply provide your vehicle’s 17-digit VIN when you place your order, and the module will arrive ready for installation.
Where is the PCM located on my 1999 Suburban 2500?
On most 1998-1999 GM full-size trucks and SUVs, the PCM is located in the engine compartment on the driver’s side, near the fender or firewall. It’s a silver metal box with multiple large electrical connectors.
What is a security relearn, and is it difficult?
A security relearn, or Passlock relearn, syncs the new PCM with your vehicle’s anti-theft system. It’s a simple procedure that usually involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating this two more times. No special tools are required.
Will this fix my check engine light?
If the check engine light is caused by a fault within the PCM itself, then yes, this part will resolve the issue. After installation, it’s recommended to clear any stored trouble codes with a basic code reader.
Is this compatible with part number 16250279?
Yes, this module is a direct, compatible replacement for several service numbers, including 16250279 and 09366810, in addition to 09355699.