If you’re wrestling with a 1999 or 2000 Chevy Tahoe, or another GM truck from that era, that just won’t run right, you know the frustration. You might be dealing with a persistent check engine light, baffling transmission behavior, or an engine that idles rough and stalls for no reason. As a technician with over two decades of experience, I’ve seen these symptoms hundreds of times, and the culprit is often a failing Powertrain Control Module (PCM).
Your vehicle’s PCM is its central computer, managing everything from fuel mixture and spark timing to transmission shift points. When it starts to go, it can create a cascade of problems that are often misdiagnosed, leading you to replace perfectly good sensors and parts. This isn’t just a replacement part; it’s a permanent solution. We take a high-quality PCM and flash it with the latest GM-approved software, specifically matched to your truck’s VIN. This ensures all factory drivability and performance updates are included, often correcting issues the original software had from day one.
A Technician’s Notebook
I remember a 2000 GMC Yukon that came into my bay with a complaint of a random, harsh 1-2 shift and an intermittent no-start. The owner had already replaced the transmission fluid, filter, and even the ignition switch. No codes were stored. On a hunch, I monitored the PCM data stream during a test drive and saw the output signals to the shift solenoids momentarily drop out. The internal processor was failing under heat. We installed a VIN-programmed PCM like this one, and the truck has been running perfectly for the owner ever since. Sometimes, the problem lies right at the source.
Is Your Truck or Van Showing These Symptoms?
A faulty PCM can manifest in many ways. If you’re experiencing any of the following, this module is likely the fix you need:
- âś” Check Engine Light is on with codes like P0601 (Internal Memory Fault) or P0606 (PCM Processor Fault).
- âś” Unexplained engine misfires or a persistent P0300 (Random Misfire) code.
- âś” Harsh or erratic automatic transmission shifting.
- âś” The engine cranks but refuses to start (no-start condition).
- âś” Poor fuel economy that has gotten progressively worse.
- âś” Communication errors with scan tools or other modules (U-codes).
- âś” Failure to pass an emissions or smog test.
A Straightforward Guide to Installation
You don’t need to be a master mechanic to install this part. The key is our VIN programming service, which makes this a plug-and-play repair. Just follow these simple steps:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes for the system capacitors to discharge.
- Locate the Old PCM: On most of these trucks and vans (like the Tahoe, Yukon, and Silverado), the PCM is located in the engine compartment, typically on the driver’s side fender or near the battery.
- Disconnect the Connectors: Carefully unlatch and remove the electrical harness connectors from the old module. Inspect them for any corrosion or damage.
- Swap the Module: Unbolt the old PCM from its mounting bracket and set it aside. Mount your new, pre-programmed module in its place.
- Reconnect and Finalize: Securely plug the harness connectors into the new PCM. Reconnect the negative battery terminal. You may need to perform a simple security relearn procedure (instructions are easily found online or in your owner’s manual), which typically involves cycling the key.
Verified Vehicle Compatibility
This module is a direct replacement for part number 16263494 and is also compatible with 16265035, 8162634940, 218-11787, and 21811787. It fits a wide range of GM vehicles. Please confirm your model and year from the list below to ensure a perfect match.
EXPRESS 1500 VAN 99-02
EXPRESS 2500 VAN 99-02 (gasoline)
EXPRESS 3500 VAN 99-02 (gasoline)
SAVANA 1500 VAN 99-02
ASTRO 99-01 (4.3L)
GMC 3500 PICKUP 99-00 (gasoline)
S10/S15/SONOMA 98-00 (4.3L)
ISUZU HOMBRE 98-00 (4.3L)
SAFARI (GMC) 99-01
GMC 1500 PICKUP 99 (5.0L, 5.7L)
BLAZER S10/JIMMY S15 98-00
TAHOE 99-00 (Classic style)
YUKON 99-00 (incl. Denali)
ESCALADE 99-00
BRAVADA 98-00
ENVOY 98-00
SIERRA 1500 PICKUP 99-00 (6 cylinder)
SUBURBAN 1500/2500 99 (gasoline)
CHEVROLET 1500 PICKUP 99 (5.7L, 5.0L)
SILVERADO 1500 PICKUP 99-00 (6 cylinder)
GMC 2500 PICKUP 99-00 (gasoline)
SAVANA 2500 VAN 99-02 (gasoline)
SAVANA 3500 VAN 99-02 (gasoline)
*Please verify your part number (ID 16263494) or contact us with your VIN if you have any questions.*
Frequently Asked Questions
Frequently Asked Questions
Do I need to program this module?
No. We handle all the programming before we ship. Simply provide your vehicle’s VIN at checkout, and it will arrive ready to install with the latest GM software updates.
What is the ‘security relearn’ and is it difficult?
The security relearn, or anti-theft relearn, syncs the new PCM with your vehicle’s keys. On most of these GM models, it’s a simple procedure that involves turning the key to the ‘ON’ position for 10-12 minutes, then off, and repeating two more times. It requires no special tools.
Will this fix my check engine light for good?
If the check engine light is caused by a faulty PCM (e.g., internal error codes), then yes, this module will resolve the issue. It’s crucial to ensure other potential problems like bad sensors or wiring have been ruled out.
Where do I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on a metal plate on the driver’s side of the dashboard (visible through the windshield), or on the sticker inside the driver’s side door jamb.
Is this a reliable, long-term fix?
Absolutely. We use high-quality hardware and flash it with stable, factory-approved software. This is designed to restore your vehicle’s original performance and reliability for years to come.
What part numbers does this PCM replace?
This unit is a direct replacement for service number 16263494 and is also fully compatible with 16265035, 8162634940, 218-11787, and 21811787.