Programmed 1999-2001 Astro PCM 8162634940 | Powertrain Control Module

Restore Your Van’s Reliability and Performance

Is your 1999-2001 Chevrolet Astro or GMC Safari giving you headaches? If you’re dealing with a persistent Check Engine light, stalling, rough idling, or a no-start condition that has you stumped, the culprit is often the Powertrain Control Module (PCM). As the electronic brain of your vehicle, the PCM controls everything from fuel delivery and spark timing to transmission shifting. When it fails, it can cause a wide range of frustrating and hard-to-diagnose problems.

This isn’t just a replacement part; it’s a complete solution. We take the guesswork and extra expense out of the repair by programming this module specifically for your vehicle using your VIN. This means it arrives at your door with the latest GM software updates, ready for a straightforward installation. You can bypass the costly trip to the dealership for programming and get your reliable workhorse back on the road yourself.

Is Your Vehicle Showing These Symptoms?

A failing PCM can manifest in many ways. If you’re experiencing any of the following, it’s a strong indicator that your module may need replacement:

• ✔ Unexplained Check Engine Light, especially with codes like P0601 (Internal Memory Error) or P0606 (PCM Processor Fault).
• ✔ The engine cranks but refuses to start.
• ✔ Sudden stalling or stumbling while driving.
• ✔ Harsh or erratic automatic transmission shifting.
• ✔ A noticeable decrease in fuel economy.
• ✔ Failure to pass an emissions test.
• ✔ Other modules on the vehicle’s data network are not communicating.

A Straightforward Guide to Installation

Installing your new 1999-2001 Astro PCM is a job most DIYers can handle in their own driveway. Follow these steps for a smooth replacement.

1. Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to allow the system to fully discharge.
2. Locate the PCM: On the Astro and Safari vans, the PCM is typically located in the engine compartment on the driver’s side, near the battery.
3. Disconnect the Harnesses: Carefully unclip and remove the electrical wiring harnesses connected to the old module. These connectors have locking tabs that need to be released before pulling.
4. Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware, as you may need to reuse it.
5. Install the New Module: Mount your new, pre-programmed PCM onto the bracket and secure it with the bolts.
6. Reconnect Everything: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
7. Final Steps: In some cases, a security relearn procedure may be necessary. This can typically be done by turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine.

Verified Vehicle Compatibility

This module is a direct-fit replacement for several part numbers, including 16263494, 16265035, and 8162634940. It is guaranteed to fit a wide range of GM trucks and vans. Please verify your vehicle is on the list below and provide your VIN upon purchase for correct programming.

This module fits many 1998-2002 GM models, including but not limited to:

• Chevrolet Astro & GMC Safari (1999-2001)
• Chevrolet S10, GMC Sonoma, Isuzu Hombre (1998-2000)
• Chevrolet Blazer, GMC Jimmy, Oldsmobile Bravada (1998-2000)
• Chevrolet & GMC Full-Size Pickups (1500/2500/3500)
• Chevrolet Express & GMC Savana Vans (1500/2500/3500)
• Chevrolet Tahoe, GMC Yukon, Cadillac Escalade

Note: Always match the part number (ID 16263494) when specified in the fitment data.