Restore Peak Performance to Your GM Truck or Van
Is your 1998-1999 Suburban 1500, Tahoe, or Express van acting up? Experiencing frustrating issues like stalling, rough idling, a persistent Check Engine Light, or poor fuel mileage? The problem often points directly to a failing Powertrain Control Module (PCM), the electronic brain of your vehicle. Don’t let a faulty computer keep your reliable GM workhorse off the road. This is your direct-fit, cost-effective solution.
This is a genuine, road-tested OEM PCM, part number 09355699, sourced from a salvaged vehicle. The real value here is our in-house programming service. Before we ship it, we flash the module with the latest official GM software updates, specifically matched to your vehicle using the VIN you provide. This means it arrives at your door ready for installation, with no need for an expensive trip to the dealership for programming. It’s the smart, straightforward fix for DIYers and professional mechanics alike.
From the Diagnostic Bay: The Intermittent Stall Case
I remember a ’99 Yukon that came into my shop with a problem that was driving the owner crazy. It would run perfectly for days, then suddenly stall at a stoplight and refuse to restart for 10-15 minutes. No consistent Check Engine Light codes were stored, just a history of random communication errors. The owner had already replaced the fuel pump and ignition coil based on other shops’ guesses. After confirming fuel pressure and spark were good during a no-start event, we focused on the PCM. On these GMT400 platforms, heat soak can cause internal solder joints in the PCM to fail intermittently. We swapped in a known-good, programmed PCM, and the problem vanished instantly. This module is the exact fix for that kind of elusive, heat-related failure I’ve seen countless times.
Is Your Vehicle Showing These Symptoms?
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (PCM Processor Fault).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough, erratic idling.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or failed transmission shifting.
- ✔ Communication errors with your scan tool.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- ✔ Locate the PCM: On most of these trucks and vans, the PCM is located in the engine compartment, typically on the driver’s side fender well or near the battery.
- ✔ Disconnect the Connectors: Carefully unplug the wiring harness connectors from the old PCM. There are usually release tabs you’ll need to press. Inspect the connectors for any corrosion or bent pins.
- ✔ Remove the Old Module: Unbolt the old PCM from its mounting bracket. It’s usually held in by a few 10mm bolts.
- ✔ Install the New Module: Mount your new, pre-programmed PCM into the bracket and securely re-connect the wiring harnesses. Ensure they click into place.
- ✔ Reconnect the Battery: Re-attach the negative battery terminal.
- ✔ Perform Security Relearn (If Necessary): In most cases, you will need to perform a simple security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. This allows the new PCM to sync with your vehicle’s anti-theft system. Your truck should then start normally.
Verified Vehicle Compatibility
This PCM, identified by service number 09355699, is a direct replacement for a wide range of GM vehicles. Please match your part number or vehicle from the list below to ensure compatibility. It interchanges with part numbers: 16266645, 9355699, 16250279, 16258815, 09366810, and 9366810.
ASTRO 98 (LH front by battery)
BLAZER S10/JIMMY S15 98 (RH front engine compartment)
BRAVADA 98 (4.3L)
CHEVROLET/GMC PICKUP 1500/2500/3500 98-99 (Gasoline, LH engine compartment)
ESCALADE 99 (LH front engine compartment)
ENVOY 98 (RH front engine compartment)
EXPRESS/SAVANA VAN 1500/2500/3500 98-99 (Gasoline)
ISUZU HOMBRE 98 (4.3L)
S10/S15/SONOMA 98 (4.3L)
SAFARI (GMC) 98 (LH front by battery)
SUBURBAN 1500/2500 98-99 (Gasoline, LH front engine compartment)
TAHOE/YUKON 98-99 (Gasoline, LH engine compartment)
Note: Some models have specific options; please verify ID 09355699.
Frequently Asked Questions
What do I need to do after I purchase?
After you complete your purchase, simply reply to your order confirmation email with your vehicle’s 17-digit VIN. We cannot program and ship the module without it. This ensures we load the correct software for your specific vehicle configuration.
Is this part really plug-and-play?
Yes, for the most part. Because we pre-program it to your VIN, it eliminates the need for dealer-level scan tools. However, you will likely need to perform a simple security relearn procedure, which takes about 30 minutes and only requires your ignition key. We include instructions for this easy process.
Is a CASE Relearn required?
A Crankshaft Variation Relearn (CASE Relearn) may be needed to clear a P1336 trouble code after installation. While the truck will run without it, this procedure syncs the crank sensor signal to the new PCM for optimal timing. Most local repair shops can perform this for a small fee if you don’t have a capable bi-directional scan tool.
This is a used part. How can I trust it?
As a seasoned technician, I understand the concern. That’s why every module we sell is sourced from a running, driving vehicle and is visually inspected and electronically tested to ensure full functionality. By pairing a reliable OEM part with the latest GM software, you get a dependable solution without the new-part price tag.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM also controls transmission functions like shift points and line pressure. If your transmission issues are electronic and caused by a faulty PCM, this module will resolve them. However, it will not fix internal mechanical failures within the transmission itself.