Programmed 1999-2002 Savana 1500 PCM 16265035 | VIN Flashed ECM

Restore Your Van’s Reliability and Performance

Is your 1999-2002 GMC Savana 1500 van running rough, stalling unexpectedly, or showing a persistent check engine light? A failing Powertrain Control Module (PCM), often called the ECM, is a common culprit behind these frustrating issues. As the brain of your vehicle’s engine and transmission, a faulty PCM can cause a cascade of problems, from poor fuel economy to a no-start condition that leaves you stranded. This replacement PCM is the definitive solution, arriving at your door programmed with the latest GM software updates, specifically matched to your vehicle’s VIN.

Is Your Van Exhibiting These PCM Failure Symptoms?

A failing computer can manifest in many ways. If you’re a professional technician or a hands-on DIYer, you’ve likely seen these before. Check if your vehicle is showing any of these classic signs of a bad 1999-2002 Savana 1500 PCM:

• ✔ Unexplained Check Engine Light (CEL) illumination
• ✔ Engine stalling, stumbling, or misfiring
• ✔ Harsh or erratic automatic transmission shifting
• ✔ A complete no-start or difficult starting condition
• ✔ Noticeable decrease in fuel efficiency
• ✔ Communication-related Diagnostic Trouble Codes (DTCs) like U0100
• ✔ Internal module failure codes such as P0601, P0603, or P0606

Straightforward Installation to Get Your Van Running Right

Installing your new PCM is a manageable job for a DIYer with basic tools. Our pre-programming service eliminates the need for expensive dealer-only equipment. Just follow these general steps to get back on the road.

1. Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
2. Locate the PCM: On most Savana and Express vans, the PCM is located in the engine compartment on the left-hand (driver’s side) rear area. On some trucks and SUVs, it may be on the fender or near the battery.
3. Disconnect Connectors: Carefully unclip and remove the wiring harness connectors from the old module. Inspect them for any corrosion or damage.
4. Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
5. Install the New PCM: Mount your new, pre-programmed PCM in the same location and securely re-attach the wiring harness connectors.
6. Reconnect Battery: Re-attach the negative battery terminal.
7. Perform Security Relearn: You will likely need to perform a GM Security Relearn Procedure (VATS/Passlock) to sync the new PCM with your vehicle’s anti-theft system. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. See your owner’s manual for the exact procedure.

Verified Compatibility for Your GM Vehicle

This module is a direct replacement for part number 16265035 and is also compatible with part numbers 16263494, 8162634940, 218-11787, and 21811787. It fits a wide range of GM trucks, vans, and SUVs. Please verify your vehicle from the list below: