1998-1999 Chevrolet 3500 Powertrain Control Module (PCM) 09355699 – Programmed to Your VIN

Struggling with erratic engine performance in your 1998-1999 Chevrolet 3500? Imagine hauling a heavy load uphill only to face sudden stalling or rough idling—frustrating, right? As a seasoned automotive advisor with over two decades in diagnostics and parts, I’ve seen how a faulty powertrain control module can turn reliable drives into headaches. This pre-programmed PCM, part number 09355699, arrives flashed with the latest GM updates tailored to your VIN, restoring smooth operation and peace of mind. Let’s dive into why this is your go-to solution for 1998-1999 Chevrolet 3500 PCM issues.

Key Features & Benefits

This PCM isn’t just a replacement—it’s optimized for your exact vehicle. We program it using your provided VIN, ensuring it matches GM’s newest software for enhanced fuel efficiency and emissions control. Compatible with part numbers like 16250279, 09366810, and 09355699, it supports gasoline engines in models from that era.

• VIN-Specific Programming: Eliminates generic mismatches, preventing check engine lights from common calibration errors.
• Latest GM Updates: Improves throttle response and idle stability, ideal for demanding tasks like towing or off-road use.
• Direct Fit: Located in the left front engine compartment, it integrates seamlessly without modifications.
• Reliability Boost: Reduces risks of overheating or misfires, extending engine life in high-mileage trucks.

From my experience, owners often notice better acceleration after installation, especially in cold starts or heavy traffic—real benefits that keep your 3500 running strong.

Common Issues & How This Fixes Them

Dealing with a failing PCM in your 1998-1999 Chevrolet 3500? Symptoms like intermittent no-start conditions, poor fuel economy, or transmission shifting problems are telltale signs. I’ve diagnosed countless cases where corrosion or electrical faults trigger diagnostic trouble codes (DTCs) such as P0601 (internal control module memory error) or P0102 (mass airflow sensor circuit low input).

For instance, if your truck hesitates during acceleration on highways, it could stem from outdated software failing to adjust fuel mixtures properly. This programmed PCM resolves that by recalibrating sensors and actuators, clearing those DTCs and restoring optimal performance.

Another scenario: Rough idling after rain? Water intrusion often shorts the module, leading to erratic behavior. Replacing with this updated unit seals out issues, ensuring consistent engine management. Pro tip: Always check battery connections first—weak voltage can mimic PCM failures, saving you time and hassle.

Expert advice: Scan for codes with an OBD-II tool before swapping. If you see P0300 (random misfire) or similar, this PCM often fixes it by fine-tuning ignition timing. In my shop days, I’d tell customers this swap cuts diagnostic time in half, getting you back on the road faster.

Easy Installation Guide

Swapping the PCM in your 1998-1999 Chevrolet 3500 is straightforward for DIYers or pros. Tools needed: Socket set, screwdriver, and anti-static wrist strap to avoid damaging electronics.

1. Disconnect the battery to reset the system and ensure safety.
2. Locate the module in the left front engine compartment (near the battery on some variants).
3. Remove mounting bolts and unplug connectors carefully—note their positions.
4. Install the new PCM, reconnect, and tighten securely.
5. Reconnect the battery and clear any stored codes with a scanner.

Test drive to verify—expect smoother shifts and no warning lights. If issues persist, double-check wiring harnesses for damage, a common oversight I’ve fixed many times.

Fitment Details

This PCM fits a range of 1998-1999 GM vehicles with gasoline engines, focusing on left-front engine compartment placements. It’s ideal for your Chevrolet 3500, but also compatible with similar models like Tahoe, Yukon, Suburban 1500/2500, Express vans, Astro, Safari, Blazer, S10/Sonoma, Bravada, Envoy, and Isuzu Hombre (specific IDs like 16250279 or 16258815 without ZN4 option).

For 1998-1999 Chevrolet 3500 electronic control module replacement, confirm your ID matches. Provide your VIN post-purchase for precise programming—we handle the rest before shipping.

Ready to fix those 1998-1999 Chevrolet 3500 PCM problems and regain reliable power? Order now and supply your VIN for a hassle-free match. Don’t let engine glitches sideline your workhorse—act today for smoother drives tomorrow!