Restore Peak Performance to Your GM Truck or SUV
Is your trusty Chevrolet, GMC, or Isuzu suddenly acting up? If you’re dealing with a frustrating no-start condition, erratic engine behavior, poor fuel mileage, or a persistent Check Engine Light, the root cause is often a failing Powertrain Control Module (PCM). As the central computer of your vehicle, a faulty PCM can create a cascade of problems that are difficult to diagnose. This module, part number 16263494, is the definitive solution, arriving at your door fully programmed with the latest GM software updates specific to your vehicle’s VIN.
Over my 20 years in the shop, I’ve seen countless owners replace sensor after sensor, only to find the core issue was the PCM all along. A failing module can send incorrect signals, making good parts seem faulty. By replacing your old computer with this pre-programmed unit, you’re not just swapping a part; you’re restoring the vehicle’s operational logic. This is the most direct path to fixing those stubborn electronic gremlins and getting your dependable truck or van back on the road. This is the correct fix for a faulty 1999 Suburban 2500 PCM and many other GM vehicles.
A Technician’s Notebook
I remember a 1999 Chevy Tahoe that came into the bay with a complaint of intermittent stalling and harsh 1-2 shifting. The owner had already replaced the throttle position sensor and the mass air flow sensor with no luck. The scanner wasn’t showing consistent codes, just a random misfire now and then. After checking wiring and grounds, we focused on the PCM. On these older GM trucks, heat cycles and vibrations can cause internal solder joints in the module to fail over time, leading to exactly these kinds of unpredictable issues. We installed a VIN-programmed PCM, and the problems vanished instantly. The shifts were smooth, and the engine idled perfectly. It’s a classic case where the “brain” was the problem, not the sensors it was controlling.
Is Your Vehicle Showing These Symptoms?
A failing PCM can manifest in various ways. If you’re experiencing any of the following, it might be time for a replacement:
- ✔ Check Engine Light is on with codes like P0601, P0604, or P0606 (Internal Control Module Errors).
- ✔ Vehicle will not start or is very hard to start.
- ✔ Rough or unstable idle.
- ✔ Poor or declining fuel economy.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Failure to pass an emissions inspection.
- ✔ Intermittent stalling for no apparent reason.
A Straightforward Guide to Installation
One of the biggest benefits of this module is its simple, direct-fit installation. Because we program it to your VIN before shipping, you can avoid a costly trip to the dealership. Here’s how easy it is:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Old PCM: On most compatible vehicles, the PCM is found in the engine compartment, often on the driver’s or passenger’s side fender well, sometimes near or under the battery tray.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old module. They have locking tabs that may need to be gently pried up. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. It’s typically held in place by a few small bolts.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely fasten the bolts.
- Reconnect and Secure: Plug the wiring harnesses firmly into the new module until they click into place. Reconnect your vehicle’s negative battery terminal.
- Final Step: In some cases, a security relearn procedure may be necessary, which can typically be done without special tools. Instructions are readily available online for your specific model.
Verified Vehicle Compatibility
This module is a direct replacement for part number 16263494 and interchanges with 16265035, 8162634940, 218-11787, and 21811787. It is guaranteed to fit a wide range of GM models. Please verify your part number or match your vehicle from the list below. This is the correct 1999 Suburban 2500 PCM and is also compatible with:
- Astro Van (1999-2001)
- Blazer S10 / Jimmy S15 (1998-2000)
- Bravada (1998-2000)
- Chevrolet/GMC Pickup 1500, 2500, 3500 (1999-2000)
- Escalade (1999-2000)
- Envoy (1998-2000)
- Express / Savana Van 1500, 2500, 3500 (1999-2002)
- Hombre (1998-2000)
- S10 / S15 / Sonoma (1998-2000)
- Safari Van (1999-2001)
- Sierra / Silverado 1500 (1999-2000, 4.3L V6)
- Suburban 1500 / 2500 (1999)
- Tahoe / Yukon (1999-2000)
Ordering a reliable, pre-programmed 1999 Suburban 2500 PCM is the smartest way to get your vehicle running right again, saving you time, money, and diagnostic headaches.
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, you will receive an email prompting you for your vehicle’s 17-digit VIN. You can also add your VIN in the ‘notes’ section at checkout. We cannot ship your part until we receive the VIN.
Is this a plug-and-play part?
Yes. Because we flash the module with your vehicle’s specific VIN and the latest GM software, it is ready for installation right out of the box. In some rare cases, a simple key relearn procedure may be required, which does not need special tools.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls engine performance and transmission shift points. If the module is faulty, it can cause harsh, late, or erratic shifts. A new PCM often resolves these issues.
What is the difference between a PCM and an ECM?
The terms are often used interchangeably. ECM (Engine Control Module) traditionally controlled just the engine, while PCM (Powertrain Control Module) controls both the engine and transmission. For the vehicles on this fitment list, this module functions as the PCM.
Do I need to return my old PCM (core)?
No core return is required for this part. You can keep or responsibly dispose of your old module.