Get Your Truck Running Right Again
Is your 1998 or 1999 Suburban, Tahoe, or another GM truck giving you headaches? If you’re dealing with frustrating issues like stalling, poor fuel economy, or a persistent Check Engine Light, a failing Powertrain Control Module (PCM) is often the culprit. As a technician with over 20 years of experience, I’ve seen how a faulty PCM can create a cascade of problems that are tough to diagnose. This isn’t just a replacement part; it’s a reliable, cost-effective solution to restore your vehicle’s performance and dependability.
This is a thoroughly tested, used OEM PCM that we program specifically for your vehicle before it ships. Simply provide us with your 17-digit Vehicle Identification Number (VIN) after your purchase, and we’ll flash the module with the latest official GM software updates. This ensures perfect communication between the engine, transmission, and other systems, just like it came from the factory. You get a part that’s ready to install right out of the box, saving you from an expensive trip to the dealership for programming.
A Technician’s Notebook
I remember a ’99 Yukon that came into my shop with a maddeningly intermittent no-start condition. The owner had already replaced the battery and fuel pump with no luck. After connecting my scan tool, I noticed communication with the PCM was dropping out randomly. Instead of a clear fault code, the module was just going silent. This is a classic sign of internal PCM failure. We sourced a quality used module like this one, programmed it to the Yukon’s VIN, and performed the security relearn. The truck fired up instantly and the problem never returned. It’s a fix I’ve performed hundreds of times on these GMT400 platform trucks.
Is Your GM Truck Showing These Signs?
A failing PCM can manifest in various ways. If you’re experiencing any of the following, this module is likely the solution you need:
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault)
- ✔ The engine cranks but refuses to start
- ✔ Unexplained stalling, especially when warm
- ✔ Rough or erratic idling
- ✔ Harsh or incorrect transmission shifting
- ✔ Noticeable decrease in fuel economy
- ✔ Failure to pass an emissions test
A Straightforward Guide to Installation
Replacing the 1998-1999 Suburban 1500 PCM is a job most DIYers can handle in under an hour with basic hand tools. Follow these steps carefully:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: On most of these trucks and vans, the PCM is located in the engine compartment, typically on the driver’s side fender well.
- Disconnect Connectors: Carefully unclip and remove the electrical harness connectors from the old module. There are usually several color-coded connectors; they only fit one way, so you can’t mix them up.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Bolt your new, pre-programmed PCM into the mounting bracket.
- Reconnect Everything: Firmly plug the harness connectors back into the new PCM until they click into place. Reconnect your negative battery terminal.
- Perform Security Relearn (If Necessary): Your vehicle may not start until you complete a simple security relearn procedure to sync the new PCM with your vehicle’s anti-theft system. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Instructions are readily available online for your specific model.
Will This Fit My GM Vehicle?
This PCM is a direct replacement for part numbers 09366810, 09355699, 16266645, 16250279, and 16258815. It is guaranteed to fit the following vehicles, provided your original module carries a compatible service ID number (often 9355699):
- ✔ 1998-1999 Chevrolet & GMC Suburban 1500/2500 (Gasoline)
- ✔ 1998-1999 Chevrolet & GMC C/K Pickups 1500/2500/3500 (Gasoline)
- ✔ 1998-1999 Chevrolet Tahoe & GMC Yukon (Gasoline)
- ✔ 1999 Cadillac Escalade
- ✔ 1998-1999 Chevrolet Express & GMC Savana Vans 1500/2500/3500 (Gasoline)
- ✔ 1998 Chevrolet Astro & GMC Safari
- ✔ 1998 Chevrolet S10, GMC Sonoma, Oldsmobile Bravada, Chevrolet Blazer, GMC Jimmy, Isuzu Hombre (4.3L V6 models)
- ✔ 1998 Oldsmobile Bravada & GMC Envoy (w/o build date opt ZN4)
Please verify the part number on your current module to ensure an exact match.
Frequently Asked Questions
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming before we ship the part. It will arrive flashed with the latest GM software for your specific VIN, making it ready for installation.
What is a security relearn procedure?
It’s a simple, tool-free process that syncs the new PCM to your vehicle’s anti-theft system. It usually takes about 30 minutes and involves a few cycles of turning the ignition key. Your vehicle will not start until this is completed.
Why should I buy a used PCM?
A tested, correctly programmed used OEM module is a highly reliable and budget-friendly alternative to a costly new part from a dealer. These original GM units are robust and built to last.
What information do you need from me?
After you place your order, we will need the 17-digit Vehicle Identification Number (VIN) from your vehicle’s dashboard or driver’s door jamb sticker to perform the programming.
How do I find the part number on my old module?
The part number is printed on a sticker directly on the case of your existing PCM. Matching this number is the best way to confirm compatibility.