Is Your GM Truck or Van Running Rough?
If you’re dealing with a persistent Check Engine Light, erratic engine performance, harsh shifting, or even a no-start condition in your 1998-1999 GM vehicle, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer for your engine and transmission, its health is critical. This isn’t just a part; it’s the brain of your vehicle. When it fails, it can be incredibly frustrating, leaving you stranded or with an unreliable ride. I’ve seen it hundreds of times in my shopโa perfectly good engine held back by a faulty computer.
Real-World Diagnosis: A Customer’s Story
“A customer’s ’99 Tahoe came in last week with these exact symptoms. It would randomly stall at stoplights and had a transmission that shifted hard from first to second. They had already replaced the throttle position sensor and the mass air flow sensor with no luck. After connecting my scanner, I saw erratic data streams from the PCM. We swapped in a VIN-programmed module just like this one, and the truck ran like it just rolled off the factory floor. Itโs a common failure point I’ve diagnosed on over 200 of these GMT400 platform trucks.”
The Direct Solution: A VIN-Programmed PCM
This is a genuine, tested, and reliable used OEM PCM that is the direct solution for your vehicle’s issues. We take the guesswork and high dealership costs out of the equation. Before we ship it, our technicians will program the module with the latest GM software updates, specifically matched to your vehicle’s unique Vehicle Identification Number (VIN). This ensures all factory parameters for your engine, transmission, and options are correctly loaded, making for a seamless installation.
Common Symptoms of a Failing GM PCM:
- โ Persistent Check Engine Light (CEL) with various codes
- โ Engine stalling, stumbling, or misfiring
- โ Harsh or erratic automatic transmission shifting
- โ Complete no-start or intermittent starting problems
- โ Poor fuel economy and loss of power
- โ Communication errors with diagnostic scan tools
Easy Installation for the DIYer or Professional
Replacing the 1998-1999 Suburban 2500 PCM is a straightforward job that can be done with basic hand tools. Because we program it to your VIN, you won’t need a trip to the dealer for expensive flashing or security relearn procedures in most cases.
- Safety First: Disconnect the negative battery terminal and wait a few minutes for the system to discharge.
- Locate the PCM: On most of these trucks and vans, it’s located in the engine compartment, typically on the driver’s side inner fender.
- Disconnect Connectors: Carefully unclip the wiring harness connectors. Inspect the pins for any corrosion or damage.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed PCM into place and securely reconnect the wiring harnesses.
- Reconnect Battery: Reattach the negative battery terminal. Your vehicle is now ready to start.
Expert Pro Tip: Connector Health is Key
Before plugging in your new PCM, take a moment to inspect the vehicle’s harness connectors. Over 20+ years, moisture and dirt can cause corrosion on the pins. Use a small brush and some quality electrical contact cleaner to gently clean both the male and female pins. A clean, solid connection is vital for the PCM to function correctly and can prevent a host of future issues.
Guaranteed Compatibility
This module is a direct replacement for several part numbers. Please verify that your original module has one of the following numbers printed on its label to ensure a perfect match:
Part Numbers: 16258815, 09355699, 16266645, 9355699, 16250279, 09366810, 9366810.
Broad Vehicle Fitment
This Electronic Control Module (ECM/PCM) with service ID 9355699 is compatible with a wide range of gasoline-powered GM vehicles from 1998 and 1999. While this listing is focused on the 1998-1999 Suburban 2500 PCM, it also fits the following models:
- Cadillac: Escalade (1999)
- Chevrolet: Astro Van (1998), Blazer S10 (1998), C/K 1500/2500/3500 Pickups (1998-1999), Express 1500/2500/3500 Vans (1998-1999), S10 Pickup (1998), Suburban 1500 (1998-1999), Tahoe (1998-1999)
- GMC: C/K 1500/2500/3500 Pickups (1998-1999), Envoy (1998), Jimmy S15 (1998), Safari Van (1998), Savana 1500/2500/3500 Vans (1998-1999), Sonoma S15 (1998), Yukon (1998-1999)
- Isuzu: Hombre (1998, 4.3L)
- Oldsmobile: Bravada (1998)
IMPORTANT: After purchase, please send us a message with your vehicle’s 17-digit VIN. We cannot ship your order until we have this information to complete the programming.