Restore Peak Performance to Your GM Truck or Van
Is your trusty Chevrolet Express 2500 Van or another GM vehicle suddenly giving you trouble? If you’re dealing with a persistent Check Engine Light, unpredictable stalling, rough idling, or harsh transmission shifting, the culprit is often a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, its health is critical. This isn’t just an annoyance; it affects your vehicle’s reliability, fuel economy, and safety. This replacement 1999-2002 Express 2500 PCM is the definitive solution to get your workhorse back in top form.
We take the guesswork and high costs out of the repair. Unlike a generic part from a big box store, this module arrives at your door fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We load it with the latest GM factory software updates, ensuring optimal performance and communication with all other onboard systems. This means you can skip the expensive trip to the dealership for programming—a savings of both time and money.
From the Diagnostic Bay
I remember a customer with a 2001 Savana 3500, a contractor’s van that was his livelihood. It had a baffling no-start condition that was intermittent. He’d already replaced the battery, alternator, and starter. When we hooked up the scan tool, we saw a slew of U-codes (communication loss) and a hard P0601 ‘Internal Control Module Memory Check Sum Error’. This pointed directly to a failed PCM. The internal processor was failing, causing it to lose communication with the rest of the van. We installed a VIN-programmed module just like this one, and the van fired right up and has been reliable ever since. These symptoms are classic signs, and a pre-programmed module is the most efficient fix.
Is Your Vehicle Showing These Telltale Signs?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, it’s time to consider a replacement:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Diagnostic Trouble Codes (DTCs) like P0601, P0606, or other communication errors.
- ✔ Engine stalling or shutting off while driving.
- ✔ Rough or erratic engine idling.
- ✔ Harsh or delayed transmission shifting.
- ✔ A no-start condition where the engine cranks but won’t fire.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Failure to pass an emissions inspection.
A Straightforward Guide to Installation
Replacing the PCM is a job most DIYers can handle with basic tools. Our pre-programmed module makes it even simpler. Here’s a general guide:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most Express/Savana vans, it’s in the LH rear of the engine compartment. On trucks and SUVs, it’s often on the LH side, sometimes near or under the battery tray. Refer to your service manual for the exact location.
- Disconnect the Connectors: Carefully unlatch and remove the wiring harness connectors from the old module. Inspect them for any corrosion or damage.
- 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, pre-programmed PCM in place and securely fasten it.
- Reconnect Everything: Plug the wiring harnesses back into the new module until they click securely in place. Reconnect the negative battery terminal.
- Final Steps: In some cases, a security relearn procedure (often called Passlock or Passkey) may be required. This can typically be done without special tools and involves a sequence of key cycles. Instructions are widely available online for your specific model.
Verified Vehicle Compatibility
This module, identified by part number 16263494, is a direct replacement for a wide range of GM vehicles. It is also a compatible replacement for part numbers 16265035, 8162634940, 218-11787, and 21811787. Please verify your vehicle is on the list below. Providing your VIN at checkout is essential for correct programming.
CHEVROLET 3500 PICKUP 99-00 (gasoline)
CHEVROLET 1500 PICKUP 99 (5.0L/5.7L, ID 16263494)
SILVERADO 1500 PICKUP 99-00 (4.3L V6)
S10/S15/SONOMA 98-00 (4.3L)
BLAZER S10/JIMMY S15 98-00
ASTRO 99-01 (ID 16263494)
EXPRESS 1500 VAN 99-02 (ID 16263494)
EXPRESS 2500 VAN 99-02 (gasoline, ID 16263494)
EXPRESS 3500 VAN 99-02 (gasoline, ID 16263494)
SUBURBAN 1500/2500 99 (gasoline, ID 16263494)
TAHOE 99-00 (gasoline, ID 16263494)
GMC 1500 PICKUP 99 (5.0L/5.7L, ID 16263494)
GMC 2500 PICKUP 99-00 (gasoline)
GMC 3500 PICKUP 99-00 (gasoline)
SIERRA 1500 PICKUP 99-00 (4.3L V6)
SAVANA 1500 VAN 99-02 (ID 16263494)
SAVANA 2500 VAN 99-02 (gasoline, ID 16263494)
SAVANA 3500 VAN 99-02 (gasoline, ID 16263494)
SAFARI (GMC) 99-01 (ID 16263494)
YUKON 99-00 (ID 16263494)
ESCALADE 99-00
BRAVADA 98-00
ENVOY 98-00
ISUZU HOMBRE 98-00 (4.3L)
Frequently Asked Questions
What exactly is VIN programming?
VIN programming is the process of loading your vehicle’s unique 17-digit Vehicle Identification Number and its associated factory software into the PCM. This ensures the module works perfectly with your specific engine, transmission, and options, just like the original one did.
Do I need to do anything after installing this 1999-2002 Express 2500 PCM?
Because the module comes pre-programmed, no dealer visit is needed. However, some GM vehicles of this era may require a simple security relearn procedure to sync the new PCM with the anti-theft system. This can usually be done in your driveway by cycling the ignition key and takes about 30 minutes.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit VIN. You can typically find it on your driver’s side dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Is this a reliable part?
Absolutely. We supply high-quality, tested modules and use official GM software for programming. This ensures a dependable repair that restores your vehicle’s factory operation and performance, solving the root cause of your issues.
Will this fix my check engine light?
If the check engine light is caused by an internal PCM failure (like codes P0601-P0606), then yes, this module is the correct fix. It’s always best to have the codes read with a scanner to confirm the diagnosis before ordering.