Restore Peak Performance to Your GM Truck or Van
Is your trusty 1999-2000 GMC Sierra 1500, or another compatible GM vehicle, suddenly giving you headaches? If you’re dealing with a persistent check engine light, rough idling, poor fuel mileage, or even a no-start condition that has you stumped, the problem often traces back to a failing Powertrain Control Module (PCM). As a technician with over two decades of experience under the hood, I’ve seen how a faulty engine computer can mimic a dozen other problems, leading to wasted time and money on unnecessary parts. This isn’t just a replacement part; it’s a reliable, plug-and-play solution designed to get your vehicle running right again.
This module is the brain of your engine and transmission, and when it fails, your vehicle’s performance suffers. We take the guesswork and high costs out of the repair. Simply provide us with your vehicle’s VIN at checkout, and our experts will program this PCM with the latest, most stable software updates directly from GM. This ensures perfect communication with your vehicle’s systems, restoring the smooth operation and efficiency you expect. This is the same service a dealership provides, but without the exorbitant cost and hassle of towing your vehicle in for programming. Get the right fix, the first time, with a properly prepared 1999-2000 Sierra 1500 PCM.
A Technician’s Notebook
I remember a 2000 Chevy Express van that came into the shop with a complaint of intermittent stalling. The owner had already replaced the fuel pump and filter, convinced it was a fuel delivery issue. The scan tool showed no hard codes, just a history of random communication faults. After checking fuel pressure and ignition, everything seemed fine. On a hunch, I tapped on the original PCM while the engine was running, and it immediately stumbled. The internal circuit boards on these older modules can develop micro-fractures from years of heat cycles and vibration, causing unpredictable problems that don’t always set a specific code. A new, programmed PCM fixed it instantly. It’s a classic case where the ‘brain’ was the problem, not the ‘body’.
Is Your Truck Showing These Symptoms?
A failing PCM can cause a wide array of confusing issues. If you’re experiencing any of the following, your engine computer is a likely culprit:
- ✔ Unexplained Check Engine Light (CEL) illumination
- ✔ Diagnostic Trouble Codes (DTCs) such as P0601 (Internal Memory Error) or P0606 (PCM Processor Fault)
- ✔ Vehicle won’t start or is very difficult to start
- ✔ Rough, erratic idling or stalling
- ✔ Noticeable decrease in fuel economy
- ✔ Harsh or incorrect automatic transmission shifting
- ✔ Failure to pass an emissions test
A Straightforward Guide to Installation
Replacing the PCM on these GM trucks is a job most DIYers can handle in their own driveway. Our VIN programming makes it a simple swap.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
- Locate the Module: On the 1999-2000 Sierra/Silverado, the PCM is typically found in the engine compartment on the driver’s side, sometimes under the battery tray. On vans, it’s often in the LH rear of the engine compartment.
- Disconnect Connectors: Carefully unlatch and remove the electrical harness connectors from the old PCM. These connectors have locking tabs that need to be released. Avoid pulling on the wires themselves.
- Remove the Old PCM: Unbolt the module from its mounting bracket. Keep the hardware, as you may need to reuse it.
- Install the New PCM: Mount your new, pre-programmed PCM and securely re-attach the electrical connectors. You should hear a ‘click’ as they lock into place.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn: In many cases, you will need to perform a simple security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. This allows the new PCM to sync with your vehicle’s anti-theft system.
Verified Vehicle Compatibility
This 1999-2000 Sierra 1500 PCM is a direct-fit replacement for a wide range of GM vehicles. Please match your original part number (e.g., 16263494) or verify your vehicle is on the list below. This unit is compatible with part numbers: 16263494, 16265035, 8162634940, 218-11787, 21811787.
CHEVROLET 2500 PICKUP 00 Electronic Control Module; gasoline (LH front engine compartment)
EXPRESS 1500 VAN 00 Electronic Control Module; (LH rear engine compartment)
EXPRESS 2500 VAN 00 Electronic Control Module; (LH rear engine compartment), gasoline
EXPRESS 3500 VAN 00 Electronic Control Module; (LH rear engine compartment), gasoline
SAVANA 1500 VAN 01-02 Electronic Control Module; (LH rear engine compartment), ID 16263494
ASTRO 00-01 Electronic Control Module; (LH front by battery), ID 16263494
GMC 3500 PICKUP 00 Electronic Control Module; gasoline (LH front engine compartment)
EXPRESS 2500 VAN 01-02 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
S10/S15/SONOMA 99-00 Electronic Control Module; (RH front engine compartment), 4.3L
SAVANA 1500 VAN 00 Electronic Control Module; (LH rear engine compartment)
ASTRO 99 Electronic Control Module; (LH front by battery), (4.3L), ID 16263494
ISUZU HOMBRE 99-00 Electronic Control Module; (RH front engine compartment), 4.3L (6 cylinder)
SAFARI (GMC) 99-01 Electronic Control Module; (LH front by battery), ID 16263494
SAVANA 3500 VAN 01-02 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
EXPRESS 1500 VAN 99 Electronic Control Module; (LH rear engine compartment), ID 16263494
GMC 1500 PICKUP 99 Electronic Control Module; 5.0L, (LH engine compartment), ID 16263494
BLAZER S10/JIMMY S15 98 Electronic Control Module; (RH front engine compartment), w/build date opt ZN4
GMC 1500 PICKUP 99 Electronic Control Module; 5.7L, (LH engine compartment), ID 16263494
SAVANA 3500 VAN 99 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
SAVANA 3500 VAN 00 Electronic Control Module; (LH rear engine compartment), gasoline
TAHOE 00 Electronic Control Module; Classic style (LH front engine compartment)
YUKON 99 Electronic Control Module; (LH engine compartment), ID 16263494
ESCALADE 99 Electronic Control Module; (LH front engine compartment), ID 16263494
ESCALADE 00 Electronic Control Module; (LH front under battery)
EXPRESS 2500 VAN 99 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
S10/S15/SONOMA 98 Electronic Control Module; 6-262 (4.3L), w/build date opt ZN4
YUKON 00 Electronic Control Module; (LH front under battery), Denali
BRAVADA 98 Electronic Control Module; (6-262, 4.3L), w/build date opt ZN4
CHEVROLET 3500 PICKUP 00 Electronic Control Module; gasoline (LH front engine compartment)
ENVOY 99-00 Electronic Control Module; (RH front engine compartment)
EXPRESS 1500 VAN 01-02 Electronic Control Module; (LH rear engine compartment), ID 16263494
EXPRESS 3500 VAN 99 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
GMC 3500 PICKUP 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
ISUZU HOMBRE 98 Electronic Control Module; 4.3L (6 cylinder), w/extended build date opt ZN4
SIERRA 1500 PICKUP 99-00 Electronic Control Module; (LH front under battery), 6 cylinder
SAVANA 2500 VAN 00 Electronic Control Module; (LH rear engine compartment), gasoline
SUBURBAN 1500 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
CHEVROLET 1500 PICKUP 99 Electronic Control Module; 5.7L, (LH engine compartment), ID 16263494
EXPRESS 3500 VAN 01-02 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
GMC 2500 PICKUP 00 Electronic Control Module; gasoline (LH front engine compartment)
SILVERADO 1500 PICKUP 99-00 Electronic Control Module; (LH front under battery), 6 cylinder
SUBURBAN 2500 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
BLAZER S10/JIMMY S15 99-00 Electronic Control Module; (RH front engine compartment)
CHEVROLET 3500 PICKUP 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
SAVANA 1500 VAN 99 Electronic Control Module; (LH rear engine compartment), ID 16263494
TAHOE 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
BRAVADA 99-00 Electronic Control Module; (RH front engine compartment)
CHEVROLET 1500 PICKUP 99 Electronic Control Module; 5.0L, (LH engine compartment), ID 16263494
SAVANA 2500 VAN 99 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
SAVANA 2500 VAN 01-02 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
ENVOY 98 Electronic Control Module; (RH front engine compartment), w/build date opt ZN4
GMC 2500 PICKUP 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the PCM with the exact software and calibrations your specific vehicle requires. This includes engine size, transmission type, and emissions equipment, ensuring a perfect match and seamless operation without a trip to the dealer.
Is this a plug-and-play part?
Yes, for the most part. Because we program it to your VIN, it eliminates the need for expensive scan tools. However, you will likely need to perform a simple ‘security relearn’ procedure at home, which takes about 30 minutes and only requires your ignition key. We include instructions for this.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM (like code P0601), then yes, this will resolve the issue. However, if the light is on for another reason (e.g., a bad oxygen sensor), you will still need to repair that separate problem. A proper diagnosis is always recommended.
How do I find my original part number?
The part number is printed on a sticker on the case of your current PCM. You may need to remove the module to see it clearly. Matching the part number is a great way to confirm compatibility, in addition to using our fitment list.
What if I have a different problem? Can I return it?
We stand by our products. However, because each module is specifically programmed for a customer’s VIN, it’s crucial to diagnose your vehicle’s problem correctly before ordering. Please review our return policy or contact us if you are unsure about your diagnosis.