Get Your Workhorse Back on the Job
Is your 1999-2002 Savana 2500 Van or GM truck suddenly unreliable? A failing Powertrain Control Module (PCM), the vehicle’s main computer, is often the culprit behind a host of frustrating issues. From a stubborn Check Engine Light to poor engine performance and erratic transmission shifting, a faulty PCM can bring your work to a halt. This isn’t just an inconvenience; it’s a problem that affects your vehicle’s core operations. We offer a dependable and straightforward solution: a replacement PCM, professionally programmed with the latest GM software updates specifically for your vehicle.
The process is simple. After your purchase, you provide us with your vehicle’s 17-digit VIN. Our technicians then flash the module, ensuring it’s a perfect match for your truck’s specific configuration. This means no expensive trips to the dealership for programming. You receive a component that is ready for installation right out of the box, designed to restore the performance and reliability you depend on. This is the definitive fix for getting your vehicle running correctly again.
From the Diagnostic Bay
I remember a 2001 Express 2500 that came into my shop with a complaint that stumped two other mechanics. The van would randomly stall at idle, the gauges would flicker, and it threw a mix of communication codes (U-codes) and a P0601 for internal memory checksum error. The owner had already replaced the battery and alternator. After checking the main power and ground circuits to the PCM, it was clear the module itself was failing internally. These older GM PCMs are notorious for solder joint failures from years of heat cycles. We installed one of our VIN-programmed modules, performed the 30-minute security relearn, and the van ran perfectly. It’s a classic case where chasing symptoms is a waste of time; replacing the core component is the only real fix.
Is Your GM Truck or Van Showing These Signs?
A failing PCM can cause a wide range of problems. If you’re experiencing any of the following, this module is likely the solution you need:
- ✔ Check Engine Light is on with codes like P0601, P0602, or P0606
- ✔ Vehicle won’t start or has intermittent starting issues
- ✔ Poor fuel economy
- ✔ Rough or unstable engine idle
- ✔ Harsh or incorrect transmission shifting
- ✔ Communication errors with scan tools
- ✔ Failure to pass an emissions test
A Straightforward Guide to Installation
Installing your new PCM is a manageable job for a DIYer or any professional technician. Follow these steps to get back on the road:
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most Savana and Express vans, the PCM is located in the engine compartment, on the driver’s side, near the rear. On pickups like the Silverado or S10, it’s often on the driver’s or passenger’s side fender well.
- Disconnect and Remove: Carefully unplug the electrical 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 electrical harnesses. Ensure they click into place.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn (CRITICAL): This step is essential. Turn the key to the ‘ON’ position (don’t start the engine) for 10-15 minutes, or until the ‘Security’ light on the dash turns off. Turn the key off for 10 seconds. Repeat this cycle two more times (for a total of three cycles). The vehicle should now start and run with the new PCM.
Verified Compatibility for Your Vehicle
This module is a direct replacement for a wide range of GM trucks and vans. It is compatible with part numbers 16263494, 16265035, 8162634940, 218-11787, and 21811787. While it fits many models, key applications include:
- ✔ 1999-2002 Chevrolet Express & GMC Savana Vans (1500, 2500, 3500)
- ✔ 1999-2000 Chevrolet & GMC C/K Pickups (1500, 2500, 3500)
- ✔ 1999-2000 Chevrolet Silverado & GMC Sierra 1500 (4.3L V6)
- ✔ 1999-2000 Chevrolet Tahoe & GMC Yukon
- ✔ 1999-2001 Chevrolet Astro & GMC Safari
- ✔ 1998-2000 Chevrolet S10, GMC Sonoma, Oldsmobile Bravada, Isuzu Hombre (4.3L)
- ✔ 1999-2000 Cadillac Escalade
Please use the detailed fitment list to confirm your exact vehicle and options. Providing your VIN ensures we send the correctly programmed part for your specific application.
Frequently Asked Questions
Do I need to program this module?
No. We handle all the programming for you before shipment. Simply provide your VIN during or after checkout, and the module will arrive ready for installation and the security relearn procedure.
What is a VIN and where do I find it?
The VIN is your vehicle’s 17-digit Vehicle Identification Number. It’s like a fingerprint for your car. You can find it on your driver’s side dashboard (visible through the windshield), on the driver’s door jamb sticker, or on your vehicle’s registration and insurance documents.
Where is the PCM located on my 1999-2002 Savana 2500 Van?
On the Savana and Express vans of this era, the PCM is typically found in the engine compartment on the driver’s side, mounted near the firewall or inner fender.
Is the security relearn procedure difficult?
Not at all. It requires no special tools, just patience. The 3-cycle key-on/key-off process takes about 30 minutes and is a standard procedure for many GM vehicles when replacing security-related components like the PCM.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both engine and transmission functions. If the module is failing, it can send incorrect signals to the transmission, causing harsh shifts, delayed engagement, or hunting for gears. A new, properly functioning PCM often resolves these issues.