Restore Peak Performance to Your GM Truck or Van
Is your reliable Chevrolet, GMC, or Isuzu suddenly giving you headaches? If you’re dealing with a frustrating check engine light, erratic engine behavior, harsh shifting, or even a no-start condition, the problem often points directly to a failing Powertrain Control Module (PCM). As the central computer of your vehicle, a faulty PCM can cause a cascade of issues that can be difficult to diagnose. This isn’t just a replacement part; it’s a complete, reliable solution to get your vehicle back on the road with confidence.
We take the guesswork and high cost out of the equation. Before this module ships, our experts will program it with the latest GM factory software, specifically matched to your vehicle’s VIN. This ensures seamless integration and optimal performance, restoring the fuel efficiency, shifting patterns, and engine response you expect from your truck. This is the same process a dealership would use, but without the hassle or expense of towing your vehicle and waiting for service.
A Technician’s Notebook
I remember a 1999 Chevy 2500 pickup that came into the shop with a ghost problem. The owner said it would randomly stall at red lights, but only after it was fully warmed up. No consistent codes, just pure frustration. We checked fuel pressure, sensors, and wiring—everything looked fine. On a hunch, I monitored the PCM data streams as the engine bay got hot. Sure enough, the processor started dropping data packets. The internal components were failing under heat. We installed one of these VIN-programmed PCMs, and the problem was solved instantly. It’s a classic failure mode on these workhorse trucks, and a fresh, correctly programmed module is the definitive fix.
Is Your GM Vehicle Showing These Signs of PCM Failure?
- ✔ Persistent Check Engine Light, especially with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- ✔ Unexplained drop in fuel economy.
- ✔ The engine cranks but refuses to start.
- ✔ Harsh, erratic, or delayed transmission shifting.
- ✔ Intermittent stalling, stumbling, or misfiring.
- ✔ Communication errors with your scan tool.
A Straightforward Guide to Your PCM Installation
Installing your new 1999 Suburban 2500 PCM is a job most DIYers can handle in their own driveway. Follow these steps for a smooth installation.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Old PCM: On most trucks like the Suburban, Silverado, and Sierra, the PCM is located in the engine compartment on the driver’s side, often near the battery or firewall. On Express/Savana vans, it’s typically in the LH rear of the engine compartment.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old module. These connectors have locking tabs that may need to be lifted or slid to release. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware, as you’ll need it for the new module.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and secure it with the original hardware.
- Reconnect Everything: Firmly plug the wiring harnesses into the new module until they click into place. Reconnect your vehicle’s battery terminal.
- Final Step – Security Relearn: In many cases, you will need to perform a security relearn procedure to sync the new PCM with your vehicle’s anti-theft system. This simple procedure typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. Your vehicle should then start and run correctly.
Guaranteed Fitment for Your GM Vehicle
This module is a direct, pre-programmed replacement for a wide range of GM trucks, vans, and SUVs. Please verify your vehicle is on this list and that your original part number matches one of the compatible numbers: 16263494, 16265035, 8162634940, 218-11787, or 21811787. Providing your VIN at checkout is essential for us to ensure perfect compatibility and programming.
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
Frequently Asked Questions
Do I need to program this module?
No. We handle all the programming for you before shipment. It will arrive ready to be installed in your vehicle.
What information do you need from me?
After you complete your purchase, you will need to provide us with your vehicle’s 17-digit VIN. This is crucial for us to load the correct software for your specific vehicle configuration.
Is this a difficult part to install?
For most individuals with basic mechanical skills, this is a very straightforward installation that typically takes less than an hour. Our guide above outlines the simple steps.
Will this fix my check engine light?
If your check engine light is caused by an internal failure of the PCM (common codes P0601-P0606), then this part will resolve the issue. It’s important to properly diagnose the cause of the light before ordering.
What is a CASE Relearn and will I need to do it?
CASE stands for Crankshaft Position System Variation. After installing a new PCM, this relearn procedure may be required to sync the crankshaft sensor with the new module. It often requires a capable bi-directional scan tool and is something a professional mechanic can perform quickly.
Which part numbers does this module replace?
This unit is a direct replacement for service numbers 16263494, 16265035, 8162634940, 218-11787, and 21811787.