Restore Peak Performance to Your GM Van or Truck
As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing Powertrain Control Module (PCM) can bring a perfectly good vehicle to its knees. If your 1999-2002 Savana 1500 Van is suffering from baffling issues like a persistent check engine light, poor fuel mileage, rough idling, or even a no-start condition, the PCM is often the culprit. This isn’t just a part; it’s the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to transmission shifting. When it falters, the entire powertrain suffers.
This isn’t just a generic replacement. We offer a reliable, direct-fit solution with this 1999-2002 Savana 1500 PCM. The most critical service we provide is programming it specifically to your vehicle’s Vehicle Identification Number (VIN) before it ships. This means it arrives loaded with the latest GM software updates, ready for installation without needing a trip to the dealership for expensive programming. It’s a straightforward fix that restores the precise, factory-intended operation of your engine and transmission.
A Technician’s Notebook
I remember a 2001 Savana 2500 work van that came into my shop. The owner, a plumber, was at his wit’s end. The van would randomly stall at traffic lights, but never threw a consistent code. We checked fuel pressure, sensors, and wiring harnesses for days. Finally, on a hunch, I monitored the PCM’s live data during a long test drive. I saw the processor voltage dip erratically just before a stall. We swapped in a VIN-programmed PCM, and the problem vanished instantly. It’s a classic example of how internal module failure can create ghost-like symptoms that defy standard diagnostics.
Is Your Vehicle Exhibiting These PCM Failure Signs?
A faulty PCM can manifest in numerous ways. If you’re experiencing any of the following, this module is the likely solution:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Stalling, stumbling, or rough idling
- ✔ Drastic decrease in fuel economy
- ✔ Harsh or erratic transmission shifting
- ✔ Engine cranks but refuses to start
- ✔ Failure to pass an emissions test
- ✔ Diagnostic trouble codes (DTCs) pointing to internal module failure, such as P0601, P0604, or P0606.
- ✔ Communication errors with scan tools.
A Straightforward Guide to Installation
Replacing the PCM is a job most DIYers with basic tools can handle. Following these steps ensures a smooth process:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes to allow the system to fully discharge.
- Locate the Module: On most Savana and Express vans, the PCM is found in the engine compartment, typically on the driver’s side (LH rear engine compartment). On some trucks or other models, it may be on the passenger side or under the battery tray. Confirm the location for your specific vehicle.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old PCM. These connectors have locking tabs; be gentle to avoid breaking them. There are typically 2 to 4 large connectors.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s usually held in place by a few bolts or nuts.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and secure it.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
- Security Relearn (If Necessary): In some cases, a security relearn procedure may be required. This can typically be done without special tools by cycling the key. We include instructions for this simple procedure if it applies to your vehicle.
Confirmed Compatibility for Your GM Vehicle
This module is a direct replacement for part numbers 16263494, 16265035, 8162634940, and 218-11787. It is guaranteed to fit a wide range of GM trucks and vans. Please verify your vehicle is on the list below. Providing your VIN at checkout ensures we send the correctly programmed unit for your specific application.
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 VIN is essential. It allows us to load the exact, correct software from GM for your vehicle’s specific engine, transmission, and options. This ensures perfect compatibility and function right out of the box, preventing drivability issues and error codes.
Is any additional programming needed after installation?
No, this module arrives fully programmed to your VIN. In some instances, a simple ‘Security Relearn Procedure’ is needed, which involves cycling the ignition key. We provide easy-to-follow instructions for this if it’s required for your vehicle. No special tools or dealer visits are necessary.
What is the difference between a PCM and an ECM?
ECM stands for Engine Control Module and PCM stands for Powertrain Control Module. For these GM vehicles, the terms are often used interchangeably. The PCM is a more accurate term as this single module controls both the engine and the transmission functions.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM itself (like codes P0601-P0606), then yes, this part will resolve the issue. However, if the light is on due to a faulty sensor or other component, you will still need to repair that underlying problem.
How do I know my old PCM is actually bad?
The best way is through proper diagnosis. This includes checking for specific PCM-related trouble codes, verifying power and ground at the module, and ruling out other possibilities like sensor or wiring failures. The symptoms listed above are strong indicators of a failing module.