1998 – 1999 GMC 2500 Powertrain Control Module (PCM) 09355699 – Programmed to Your VIN

Struggling with erratic engine performance in your 1998-1999 GMC 2500? A faulty powertrain control module often triggers check engine lights, stalling, or poor throttle response. As a seasoned automotive advisor with decades in diagnostics, I’ve seen these issues sideline trucks during critical hauls. This pre-programmed PCM, flashed with the latest GM updates using your VIN, restores smooth operation and reliability. Provide your VIN after purchase for exact matching—we handle the programming before shipping.

Key Features & Benefits

This PCM arrives ready-to-install, compatible with part numbers 16250279, 09366810, and 09355699. It optimizes fuel injection, ignition timing, and emissions control for your specific vehicle setup.

• Latest GM Flashing: Ensures compatibility with modern diagnostics, reducing future error codes and improving drivability.
• VIN-Specific Programming: Matches your truck’s exact configuration, eliminating generic module mismatches that cause ongoing problems.
• Enhanced Reliability: Fixes intermittent failures, boosting performance during heavy loads or long drives.
• Cost-Effective Solution: Avoid dealership markups—get a direct replacement that performs like new without the hassle.

In my experience, owners of 1998-1999 GMC models notice better fuel efficiency and smoother shifts after installation. Imagine towing a trailer up a steep grade without hesitation; this module makes that possible by fine-tuning engine parameters.

Common Issues & How This Fixes Them

Picture this: You’re on a job site, and your GMC 2500 suddenly idles roughly or refuses to start after a rainstorm. Water intrusion or electrical glitches commonly corrupt the original PCM, leading to symptoms like misfires or limp mode.

Key problems I’ve diagnosed include:

• Check Engine Light with DTC P0601 (Internal Control Module Memory Check Sum Error): This signals corrupted software. Our programmed PCM clears it by reloading fresh, VIN-matched data.
• No-Start Conditions or Stalling: Often from failed sensors not communicating properly. The replacement restores signal processing, getting you back on the road fast.
• Poor Fuel Economy and Rough Running: Caused by outdated calibrations. This module applies GM’s newest updates, optimizing air-fuel ratios for efficiency.
• Transmission Shift Issues: In trucks with automatic transmissions, a bad PCM disrupts gear changes. Our unit resolves this, ensuring seamless performance.

From years in the shop, I recommend checking for corrosion on connectors first—clean them with electrical contact cleaner to prevent recurrence. This PCM directly addresses these by providing a stable, updated control hub, preventing repeat failures.

Easy Installation Guide

Swapping the PCM in your 1998-1999 GMC 2500 takes about 30-45 minutes with basic tools. Always disconnect the battery to avoid shocks.

1. Locate the module in the left front engine compartment (near the battery on some models).
2. Remove mounting bolts and unplug harnesses carefully—label them if needed.
3. Install the new PCM, reconnect everything, and secure it.
4. Reconnect the battery and clear any stored codes with an OBD-II scanner.
5. Test drive to verify smooth operation; the system may need a short relearn period.

Pro tip: If you’re not comfortable, a local mechanic can handle it affordably. I’ve guided countless owners through this, saving them time and money.

Fitment Details

This PCM fits a range of 1998-1999 GM vehicles, focusing on gasoline engines. It’s ideal for models like the GMC 2500 with the module in the left front engine compartment, ID 16250279.

Compatible with:

• 1998-1999 GMC 2500 (gasoline, LH front engine compartment, ID 16250279)
• Other models including Yukon, Tahoe, Suburban 1500/2500, Express/Savana vans, Astro/Safari, and select Chevrolet trucks from the same era with matching IDs like 16250279 or 16258815 (without ZN4 option).
• Also suits Blazer, Envoy, Bravada, S10/Sonoma, and Isuzu Hombre variants with 4.3L or 5.7L engines.

Verify part numbers; provide VIN for confirmation. Don’t let a failing PCM disrupt your routine—order now and experience reliable performance tailored to your truck. With my expertise backing this, you’ll drive confidently again.