Restore Your Truck’s Performance with a Reliable Powertrain Control Module
Is your Chevrolet, GMC, or Isuzu truck or van acting up? Dealing with a frustrating no-start condition, rough idling, poor fuel mileage, or a persistent Check Engine Light can bring your work or weekend to a halt. As the central computer of your vehicle, the Powertrain Control Module (PCM) is responsible for managing everything from fuel delivery and spark timing to transmission shifting. When it fails, the symptoms can be unpredictable and difficult to diagnose. This is the dependable, straightforward solution you need.
This isn’t just a replacement part; it’s a complete fix. We professionally program this PCM with the latest GM software updates specifically for your vehicle using the VIN you provide. This critical step ensures that all systems communicate correctly, restoring the original performance and efficiency of your engine. By ordering this pre-programmed 1999-2000 Chevrolet 3500 PCM, you bypass the expensive trip to the dealership for programming, saving you time and money.
From the Diagnostic Bay: A Tricky Intermittent Stall
A customer brought in his 2000 Chevy Express van that would randomly stall at traffic lights. No check engine light, no obvious codes. We checked fuel pressure, ignition components—everything seemed fine. After days of testing, I hooked up a lab scope to the injector control circuits directly at the PCM. Sure enough, during one of the stalling events, I saw the signal for two injectors drop out completely. The PCM’s internal driver was failing intermittently under heat load. We installed one of these pre-programmed modules, performed the security relearn, and the van ran perfectly. It’s a classic example of how a failing PCM can create ghost-like problems that are nearly impossible to trace without replacing the core component.
Is Your GM Truck or Van Showing These Signs of PCM Failure?
A failing computer can manifest in many ways. If you’re experiencing any of the following, a faulty PCM is a likely culprit:
- ✔ Check Engine Light is on with communication-related or internal module fault codes (e.g., P0601, P0605, P0606).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The engine stumbles, misfires, or runs rough.
- ✔ Your vehicle fails an emissions test.
- ✔ Loss of power or sluggish acceleration.
A Straightforward Guide to Installation
Installing your new PCM is a job most DIYers can handle in under an hour with basic hand tools. Follow these steps to get your vehicle back in top shape.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the Old PCM: On most trucks like the Chevrolet 3500, the PCM is located in the engine compartment on the driver’s side, near the firewall or fender. On vans like the Express/Savana, it’s often in the rear of the engine compartment.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed PCM into place and securely reconnect the wiring harnesses. Ensure they click into place.
- Reconnect the Battery: Reattach the negative battery terminal.
- Perform Security Relearn (CRITICAL): Your vehicle’s anti-theft system (PassLock/VATS) must be synchronized with the new PCM. Turn the key to the ‘ON’ position for 10-12 minutes, then ‘OFF’ for 10 seconds. Repeat this cycle two more times (for a total of three 10-minute cycles). The vehicle should then start and run normally.
Guaranteed Fitment for Your GM Vehicle
This module is a direct replacement for part number 16263494 and is also compatible with service numbers 16265035, 8162634940, 218-11787, and 21811787. It is guaranteed to fit the following makes and models. Please match your part number or vehicle to this list to ensure compatibility.
CHEVROLET 1500 PICKUP 99 Electronic Control Module; 5.7L, (LH engine compartment), ID 16263494
CHEVROLET 2500 PICKUP 99-00 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
CHEVROLET 3500 PICKUP 99-00 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
SILVERADO 1500 PICKUP 99-00 Electronic Control Module; (LH front under battery), 6 cylinder
S10/S15/SONOMA 98 Electronic Control Module; 6-262 (4.3L), w/build date opt ZN4
S10/S15/SONOMA 99-00 Electronic Control Module; (RH front engine compartment), 4.3L
BLAZER S10/JIMMY S15 98 Electronic Control Module; (RH front engine compartment), w/build date opt ZN4
BLAZER S10/JIMMY S15 99-00 Electronic Control Module; (RH front engine compartment)
TAHOE 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
TAHOE 00 Electronic Control Module; Classic style (LH front engine compartment)
SUBURBAN 1500 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
SUBURBAN 2500 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
ASTRO 99-01 Electronic Control Module; (LH front by battery), ID 16263494
EXPRESS 1500 VAN 99-02 Electronic Control Module; (LH rear engine compartment), ID 16263494
EXPRESS 2500 VAN 99-02 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
EXPRESS 3500 VAN 99-02 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
GMC 1500 PICKUP 99 Electronic Control Module; 5.0L/5.7L, (LH engine compartment), ID 16263494
GMC 2500 PICKUP 99-00 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
GMC 3500 PICKUP 99-00 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
SIERRA 1500 PICKUP 99-00 Electronic Control Module; (LH front under battery), 6 cylinder
YUKON 99 Electronic Control Module; (LH engine compartment), ID 16263494
YUKON 00 Electronic Control Module; (LH front under battery), Denali
SAVANA 1500 VAN 99-02 Electronic Control Module; (LH rear engine compartment), ID 16263494
SAVANA 2500 VAN 99-02 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
SAVANA 3500 VAN 99-02 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
SAFARI (GMC) 99-01 Electronic Control Module; (LH front by battery), ID 16263494
BRAVADA 98-00 Electronic Control Module; (RH front engine compartment), check build date opt ZN4 for 98
ENVOY 98-00 Electronic Control Module; (RH front engine compartment), check build date opt ZN4 for 98
ISUZU HOMBRE 98-00 Electronic Control Module; 4.3L, (RH front engine compartment), check build date opt ZN4 for 98
ESCALADE 99 Electronic Control Module; (LH front engine compartment), ID 16263494
ESCALADE 00 Electronic Control Module; (LH front under battery)
Frequently Asked Questions
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, you will receive an email with instructions, or you can add a note with your 17-digit VIN during checkout. We cannot ship the module until we have this information.
Is any additional programming needed after installation?
No. This 1999-2000 Chevrolet 3500 PCM arrives fully programmed to your vehicle. The only procedure you must perform is the security relearn, which requires no special tools and is detailed in our installation guide.
Will this fix my specific problem?
This module corrects issues directly caused by a faulty PCM. While it solves a wide range of common problems, you should ensure your vehicle has been properly diagnosed. This part will not fix problems related to other failed sensors or mechanical issues.
My original part number is not 16263494, but it’s on the compatible list. Will this work?
Yes. Manufacturers often use several part numbers for the same component. As long as your vehicle and original part number are listed in our compatibility data, this module is the correct replacement for your truck or van.