Restore Peak Performance to Your GMC Van
As a technician with over two decades of experience under the hood, I’ve seen firsthand the frustration a failing Powertrain Control Module (PCM) can cause. Your 2003 GMC Safari is a dependable workhorse, but when its electronic brain starts to falter, you can face a nightmare of confusing symptoms—from stalling and rough idling to a persistent check engine light that won’t go away. This isn’t just an annoyance; it affects your vehicle’s reliability, fuel economy, and safety. This replacement PCM is the definitive, hassle-free solution to get your van running like new again.
This module, part number 89017733, is more than just a replacement part. It’s a complete fix. We take the guesswork and extra cost out of the equation by programming it specifically for your vehicle using your VIN. This critical step ensures all communications between the engine, transmission, and other systems are perfectly synchronized. It arrives at your door loaded with the latest GM software updates, ready for a straightforward installation. You get a reliable repair without the need for an expensive trip to the dealership for programming.
A Technician’s Notebook: The Intermittent Gremlin
I remember a 2003 Astro van—mechanically identical to the Safari in many ways—that came into my bay with a truly maddening problem. The owner said it would randomly stall at stoplights, but never consistently. It would also occasionally have a hard, jerky shift from 1st to 2nd. We checked everything: fuel pressure, sensors, wiring harnesses. No codes were stored. After days of diagnostics, we hooked up a high-speed data logger and saw the PCM was momentarily dropping its 5-volt reference signal, but so quickly it wouldn’t set a fault. A new, properly programmed PCM fixed it instantly. It’s a classic example of how a failing module can create phantom issues that even experienced techs struggle to pin down.
Is Your GMC Showing These Symptoms?
- ✔ Check Engine Light is on with no obvious cause, sometimes with communication codes like U0100.
- ✔ The engine cranks but refuses to start.
- ✔ Your vehicle experiences random stalling, stumbling, or rough idling.
- ✔ You’ve noticed a sudden drop in fuel efficiency.
- ✔ The automatic transmission is shifting erratically or harshly.
- ✔ Your scanner can’t communicate with the PCM, or you have internal module codes like P0601 or P0606.
Your Straightforward Guide to Installation
Replacing the 2003 GMC Safari PCM is a job most DIYers can handle with basic tools. The key is to work carefully and ensure all connections are secure.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes for the system capacitors to discharge.
- Locate the Module: On the GMC Safari and Chevy Astro, the PCM is typically located on the driver’s side of the engine compartment, near the battery.
- Disconnect Connectors: Carefully unclip and remove the electrical wiring harness connectors from the old PCM. Inspect them for any corrosion or damage.
- Remove the Old PCM: Unbolt the module from its mounting bracket. It’s usually held in by a few small bolts.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and secure it.
- Reconnect Everything: Firmly plug the wiring harness connectors into the new module. You should hear a click. Reconnect the negative battery terminal.
- Final Step: Some vehicles may require a security relearn procedure, which can often be done by cycling the key. Start the vehicle and let it idle for a few minutes to allow the systems to sync.
Verified Vehicle Compatibility
This PCM is a direct replacement for service number 89017733 and is compatible with a wide range of GM vehicles. We program it based on your VIN for guaranteed function. It fits models including:
- 2003 GMC Safari (LH front by battery)
- 2003 Chevrolet Astro (LH front by battery)
- 2003 Chevrolet Express / GMC Savana Vans (1500, 2500, 3500)
- 2003 Chevrolet Silverado / GMC Sierra Pickups (with 4.3L or 8.1L Gasoline engines)
- 2003 Chevrolet S10 / GMC Sonoma (with 4.3L engine)
- 2003 Chevrolet Blazer / GMC Jimmy (S-series)
- 2003 Chevrolet Suburban / GMC Yukon XL 2500 (with 8.1L engine)
- 2003 Chevrolet Avalanche 2500
- 2004 Cadillac CTS & Chevrolet Corvette (matching ID 12581565)
This professionally programmed 2003 GMC Safari PCM is the most reliable way to solve your vehicle’s electronic issues and restore its performance. Don’t let a faulty module keep you off the road.
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming before shipment. This module arrives ready to install. All you need to do is provide us with your vehicle’s VIN at checkout.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM or a software-related issue that the latest GM updates address, then yes, this will resolve it. It’s crucial to ensure other mechanical or sensor issues have been ruled out first.
Where is the PCM located on my 2003 GMC Safari?
The Powertrain Control Module is typically found in the engine bay, on the driver’s side, mounted near the battery and firewall area.
What is a VIN and why do you need it?
VIN stands for Vehicle Identification Number. It’s a unique 17-digit code for your specific vehicle. We use it to load the exact factory software and calibrations your GMC Safari needs to run correctly, ensuring perfect compatibility.
Is this a simple plug-and-play installation?
Yes, for most users. After the physical installation, your vehicle is typically ready to go. In some rare cases, a security or crank variation relearn procedure may be needed, which can often be performed without special tools.