Restore Peak Performance to Your GM Workhorse
As a technician with over two decades of experience, I’ve seen firsthand how a failing Powertrain Control Module (PCM) can bring a perfectly good work van or truck to a dead stop. If your 1999-2002 Savana 3500 Van is suffering from erratic behavior, poor fuel economy, or a persistent check engine light, you’ve come to the right place. This isn’t just a replacement part; it’s a reliable, long-term solution. The PCM is the brain of your vehicle, controlling everything from fuel injection and spark timing to transmission shifting. When it fails, the symptoms can be frustrating and difficult to diagnose.
We take the guesswork and extra cost out of the repair. Each module is professionally programmed with the latest official GM software updates, specifically matched to your vehicle’s VIN. This means no expensive trips to the dealership for programming. It’s designed to be a direct-fit, plug-and-play solution to get your vehicle running smoothly and reliably again.
A Technician’s Notebook: The Intermittent No-Start Mystery
I once had a 2001 Savana 3500 work van in my bay that was a real head-scratcher. The owner, a local plumber, said it would randomly refuse to start. No crank, no click, nothing. Then, an hour later, it would fire right up. We checked the battery, starter, and ignition switch—all perfect. The scanner showed intermittent U-codes, indicating a communication loss with the PCM. After checking the wiring harness for corrosion (a common issue on these vans), we pinpointed the fault to the internal circuitry of the original Savana 3500 Van PCM. A replacement module, properly programmed to the van’s VIN, solved the problem for good. It’s a classic example of how a failing computer can mimic a mechanical failure.
Is Your Van Exhibiting These PCM Failure Signs?
A faulty PCM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs attention:
- ✔ Check Engine Light is on with codes like P0601, P0605, or other internal processor faults.
- ✔ Vehicle refuses to start or has intermittent starting problems.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Engine stalling, stumbling, or running rough.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass an emissions inspection.
- ✔ Loss of communication with the scan tool.
A Straightforward Guide to Your PCM Installation
Replacing the Savana 3500 Van PCM is a job most DIYers can handle with basic tools. On these vans, the module is typically located in the engine compartment on the driver’s side.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: Find the module in the left-hand (driver’s side) rear of the engine compartment.
- Disconnect the Connectors: Carefully unlatch and remove the electrical wiring harness connectors. Inspect them for any corrosion or damage.
- Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely tighten the bolts.
- Reconnect Everything: Plug the wiring harness connectors firmly back into the new module until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn: You will likely need to perform a simple security relearn procedure. Typically, this involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeating this two more times. Your vehicle’s service manual will have the exact steps.
Verified Compatibility for Your GM Vehicle
This module, part number 16265035, is a direct replacement for service number 16263494 and others. It is guaranteed to fit a wide range of GM trucks and vans. Please verify your vehicle is on this list:
– Astro Van (1999-2001)
– Blazer S10 (1998-2000)
– Express Van 1500/2500/3500 (1999-2002)
– S10 Pickup (1998-2000)
– Silverado/C/K Pickup 1500/2500/3500 (1999-2000)
– Suburban (1999)
– Tahoe (1999-2000)
GMC:
– Envoy (1998-2000)
– Jimmy S15 (1998-2000)
– Safari Van (1999-2001)
– Savana Van 1500/2500/3500 (1999-2002)
– Sierra/C/K Pickup 1500/2500/3500 (1999-2000)
– Sonoma S15 (1998-2000)
– Yukon / Yukon Denali (1999-2000)
Cadillac:
– Escalade (1999-2000)
Oldsmobile:
– Bravada (1998-2000)
Isuzu:
– Hombre (1998-2000)
Frequently Asked Questions
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, you will receive instructions to reply with your 17-digit Vehicle Identification Number (VIN). We cannot ship your module until we receive this information, as it is essential for correct programming.
Is any additional programming required after installation?
No. This module arrives fully programmed to your VIN with the latest GM software. However, you will need to perform a simple security relearn procedure (also known as a CASE relearn or Passlock relearn), which takes about 30 minutes and does not require special tools.
Why is a VIN-programmed module better than one from a salvage yard?
A salvage yard module will be programmed for the donor vehicle’s options and VIN, which will cause compatibility issues, a no-start condition, and incorrect operation in your vehicle. Our modules are a clean slate, programmed specifically for your van’s configuration.
What if my original part number is not 16265035?
This module is a direct replacement for several part numbers, including 16263494, 8162634940, 218-11787, and 21811787. As long as your vehicle is on the compatibility list, this module will function correctly.
Will this fix my transmission shifting problems?
In many cases, yes. The Savana 3500 Van PCM controls transmission line pressure and shift points. If the module is the source of the fault, this replacement will resolve erratic shifting. However, this will not fix mechanical issues within the transmission itself.