Get Your GM Truck Running Right Again
Is your trusty 1998-1999 GMC Suburban 2500, or another classic GM truck, suddenly giving you headaches? If you’re dealing with perplexing issues like random stalling, erratic shifting, a persistent check engine light, or a complete no-start situation, the culprit is often a failing Powertrain Control Module (PCM). As a technician with over two decades of experience, I’ve seen how a faulty PCM can turn a reliable workhorse into a source of constant frustration. This isn’t just a part; it’s the brain of your vehicle’s engine and transmission, and when it falters, everything else does too.
We offer a straightforward, reliable solution. This is a thoroughly tested, used OEM PCM, part number 09355699, sourced from a salvaged vehicle. The real value, especially for the DIY mechanic or independent shop, is our professional programming service. Before we ship it, we flash the module with the latest GM software updates and program it specifically to your vehicle’s VIN. This critical step ensures the PCM communicates perfectly with your truck’s systems right out of the box, saving you from a costly and time-consuming trip to the dealership for programming.
From the Diagnostic Bay
I remember a 1999 Tahoe that came into my shop. The owner was at his wit’s end. It would start and run fine for a week, then suddenly refuse to start for two days. He had already replaced the fuel pump and crank sensor. When I connected my scan tool, I got an intermittent ‘No Communication’ error with the PCM. On these GMT400 platforms, the PCM is mounted in the engine bay where it’s exposed to constant heat and vibration. After 20+ years, internal solder joints and components can fail. We installed a VIN-programmed PCM just like this one, and the Tahoe fired up instantly. The key was bypassing the guesswork and addressing the core electronic failure. That’s the confidence this part provides.
Is Your Vehicle Showing These Telltale Signs?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, this module is likely the solution you need. Look out for:
- ✔ Check Engine Light is on with communication-related DTCs (e.g., P0601, P0605).
- ✔ Vehicle will not start or stalls intermittently.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Noticeable decrease in fuel economy.
- ✔ Engine performance issues like misfiring or hesitation.
- ✔ Problems with the anti-theft system (Passlock/VATS) that may require a security relearn after install.
A Straightforward Guide to Installation
Replacing the PCM on these GM trucks is a job most DIYers can handle. Our pre-programming service simplifies the process significantly. Here are the basic steps:
- 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 vans, the PCM is located in the engine compartment, typically on the driver’s side fender well or near the battery.
- Disconnect Connectors: Carefully unclip and remove the electrical harness connectors from the old PCM. There are usually colored levers or tabs that need to be released.
- Remove Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install New Module: Mount your new, VIN-programmed PCM onto the bracket and securely re-fasten the bolts.
- Reconnect Harnesses: Firmly plug the electrical connectors into the new PCM. Ensure they click into place and the locking tabs are engaged.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn (If Needed): For some vehicles, you may need to perform a simple security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Consult a service manual for your specific model’s procedure. This step recalibrates the anti-theft system to the new PCM.
Verified Compatibility for Your Vehicle
This PCM is a direct fit for a wide range of GM vehicles. Please match your original part number or verify your vehicle is on this list. This module, identified by service number 09355699, is compatible with the following part numbers: 16266645, 16250279, 16258815, and 09366810.
- Cadillac Escalade: 1999
- Chevrolet/GMC C/K 1500, 2500, 3500 Pickups (Gasoline): 1998-1999
- Chevrolet/GMC Suburban 1500, 2500 (Gasoline): 1998-1999
- Chevrolet Tahoe / GMC Yukon (Gasoline): 1998-1999
- Chevrolet Express / GMC Savana 1500, 2500, 3500 Vans (Gasoline): 1998-1999
- Chevrolet Astro / GMC Safari: 1998
- Chevrolet S10 / GMC Sonoma (4.3L): 1998
- Chevrolet Blazer / GMC Jimmy / Oldsmobile Bravada (4.3L): 1998
- GMC Envoy: 1998
- Isuzu Hombre (4.3L): 1998
Frequently Asked Questions
How do I provide my VIN number?
After completing your purchase, please send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot program and ship your module without it. You can typically find your VIN on your vehicle’s dashboard (driver’s side), door jamb sticker, or on your registration/insurance documents.
Is any additional programming required after installation?
In most cases, no. Our service covers the primary programming. However, some vehicles may require a Crankshaft Variation Relearn (CASE Relearn) to clear a P1336 code and optimize misfire detection. This is a simple procedure that can be done with many professional-grade scan tools.
Why choose a used, programmed PCM over a new one?
The primary benefits are cost and convenience. A new PCM from a dealership can be prohibitively expensive, and that price often doesn’t include the mandatory programming fee. Our tested, used OEM modules provide the same factory function at a fraction of the price, with the essential programming already completed for you.
Is this part difficult to install for a DIYer?
Not at all. For most of the listed vehicles, the PCM is easily accessible in the engine bay. The physical swap involves just a few bolts and electrical connectors. Our pre-programming service eliminates the most complex part of the job, making it a very manageable DIY repair.
What if my original part number is slightly different?
This module is compatible with several part numbers, including 16266645, 16250279, 16258815, and 09366810. As long as your vehicle is listed in our compatibility chart and your original module is one of these numbers, this part will function correctly once programmed to your VIN.