Is your 1999-2000 Silverado 1500 acting up? If you’re dealing with a persistent check engine light, erratic shifting, a no-start condition, or poor fuel mileage, the problem often points directly to a failing Powertrain Control Module (PCM). As the brain of your truck’s engine and transmission, when the PCM falters, it can cause a cascade of frustrating issues. This isn’t just a part; it’s the central command for your vehicle’s performance and reliability.
This replacement Powertrain Control Module is the definitive solution for getting your GM truck or van back to factory-spec operation. We take the guesswork and hassle out of the repair by programming the module specifically for your vehicle using your VIN. This means it arrives at your door loaded with the latest GM software updates, ready for installation. You get a reliable fix that restores performance without the expensive trip to a dealership for programming.
Case Study: The Ghost in the Machine
A customer brought in his 2000 Sierra 1500 with the 4.3L V6, a sibling to the Silverado. The complaint was a random, harsh 1-2 shift and an intermittent stall at idle. He’d already replaced the throttle position sensor and the idle air control valve, but the problem persisted. My scan tool showed no hard codes, just a history of communication loss with the transmission module. After checking the wiring harness for a solid 30 minutes, I suspected the PCM. These early V6 truck PCMs, often mounted under the battery, are susceptible to corrosion from battery acid leaks and internal board failure from heat cycles. We swapped in a VIN-programmed 1999-2000 Silverado PCM like this one, performed the quick security relearn, and the truck ran perfectly. It’s a classic case I’ve seen dozens of times: the PCM fails internally, sending faulty signals that make you chase perfectly good sensors.
Is Your Truck Showing These Symptoms?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement:
- ✔ Persistent Check Engine Light (CEL) that won’t clear
- ✔ Engine cranks but refuses to start
- ✔ Unexplained drop in fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Stalling, stumbling, or rough idling
- ✔ Failed emissions test
- ✔ Communication error codes, such as U0100 (Lost Communication with ECM/PCM)
- ✔ Internal module failure codes like P0601, P0604, or P0606
A Straightforward Guide to Installation
Installing your new 1999-2000 Silverado PCM is a manageable job for a confident DIYer. With the module pre-programmed, you’ll be back on the road in no time.
- Safety First: Always disconnect the negative terminal from your truck’s battery and secure it away from the post to prevent accidental reconnection.
- Locate the PCM: On 1999-2000 Silverado/Sierra 1500 models with the 6-cylinder engine, the PCM is typically found on the driver’s side of the engine bay, under the battery tray. You will need to remove the battery to access it.
- Disconnect the Connectors: Carefully unclip and remove the electrical wiring harness connectors from the old PCM. Inspect the connectors for any signs of corrosion or damage and clean them if necessary.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your new, VIN-programmed PCM into the bracket and securely re-fasten the bolts.
- Reconnect Everything: Plug the wiring harness connectors firmly into the new module. Reinstall the battery and its tray, then reconnect the negative battery terminal.
- Perform Security Relearn (If Needed): Some GM vehicles of this era require a simple security relearn procedure. Typically, this involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. Your vehicle may then start and run normally.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 16263494, 16265035, 8162634940, 218-11787, and 21811787. It is guaranteed to fit the following vehicles with the specified options. Please verify your part number or contact us with your VIN to ensure compatibility.
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
Don’t let a faulty computer keep your reliable GM truck off the road. Order this pre-programmed 1999-2000 Silverado PCM today and restore the performance and dependability you count on.
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship your module until we receive this information, as the programming is essential for it to function correctly in your truck.
Is this part difficult to install?
For someone with basic mechanical skills, the installation is very manageable. The most important part is disconnecting the battery first. Since we program the module for you, there’s no need for special computer tools, saving you a trip to the dealer.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM or an internal module error (like code P0601), then yes, this part will resolve the issue. It’s always best to have the codes read with a scanner to confirm the diagnosis before ordering.
What is a CASE Relearn and will I need to do one?
CASE (Crankshaft Angle Sensor Error) Relearn is a procedure that synchronizes the new PCM with the engine’s crankshaft position sensor. While our programming gets the module 99% of the way there, some vehicles may require this final step, which can be done with a capable bi-directional scan tool. The truck will often run fine without it, but may have a lingering P1336 code.
Is this a new or a used part?
This is a high-quality, tested, and verified replacement part. Each module is inspected and programmed with the latest software to ensure it meets or exceeds original equipment performance and reliability.