Restore Peak Performance to Your GM Vehicle
If you’re dealing with frustrating engine problems in your 2003 Chevrolet Astro or another compatible GM vehicle, a failing Powertrain Control Module (PCM) is often the culprit. As the brain of your vehicle’s engine and transmission, a faulty PCM can cause a cascade of issues, from poor fuel economy and rough idling to a no-start condition that leaves you stranded. This replacement PCM, part number 89017733, is the reliable, direct-fit solution to get your vehicle running smoothly again.
What sets this module apart is our professional programming service. Before we ship your part, we flash it with the latest official GM software updates, tailored specifically to your vehicle’s Vehicle Identification Number (VIN). This critical step ensures seamless communication between all your vehicle’s systems, eliminating the need for an expensive trip to the dealership for programming. You receive a part that is truly ready for installation right out of the box.
Case Study: A Tricky Diagnosis
I remember a 2003 Chevy Express van that came into my shop with a complaint that stumped two other mechanics: it would randomly refuse to start, but only after being driven for over an hour. There were no consistent trouble codes, just a general feeling that the van was ‘tired.’ We checked fuel pressure, spark, and battery connections—all were fine. On a hunch, I monitored the PCM data stream during a long test drive. Just as the customer described, after about 75 minutes, the data feeds for the camshaft and crankshaft position sensors went haywire before cutting out completely. The van stalled and wouldn’t restart. After it cooled for 30 minutes, it fired right up. This heat-soak failure pointed directly to an internal breakdown in the 2003 Astro Powertrain Control Module. A new, correctly programmed module fixed the issue permanently.
Common Signs of a Failing PCM
A failing engine computer can manifest in various ways. If your vehicle is experiencing any of the following, it might be time to inspect your PCM. Look out for Diagnostic Trouble Codes (DTCs) like P0601, P0606, or other communication errors.
- ✔ Unexplained Check Engine Light illumination
- ✔ Engine stalling, stuttering, or misfiring
- ✔ Failure to start or intermittent starting problems
- ✔ Noticeable decrease in fuel efficiency
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Communication errors with diagnostic scan tools
A Straightforward Guide to Installation
Installing your new 2003 Astro Powertrain Control Module is a manageable job for a confident DIYer. For the Astro and Safari vans, the module is located on the driver’s side of the engine bay, near the battery.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes to allow capacitors to discharge.
- Locate the PCM: On the 2003 Astro, find the module mounted by the battery on the driver’s side fender well.
- Disconnect Connectors: Carefully unclip the wiring harness connectors. These have locking tabs that may need to be gently pried or slid to release. Never force them.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. Keep the hardware, as you may need to reuse it.
- Install the New Module: Mount the new PCM onto the bracket and securely fasten it.
- Reconnect and Secure: Plug the wiring harnesses into the new module. You should hear a distinct click as they lock into place. Reconnect the negative battery terminal.
- Security Relearn: In many cases, you may need to perform a simple security relearn procedure (often called the ‘passlock’ or ‘passkey’ relearn). This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Consult your vehicle’s service manual for the exact procedure.
Verified Vehicle Compatibility
This module, service number 89017733, is a direct replacement for a wide range of GM trucks, vans, and cars. Please verify your part number and application from the list below. Providing your VIN at checkout guarantees we send the correctly programmed part for your specific vehicle.
AVALANCHE 2500 03 (LH front under battery)
BLAZER S10/JIMMY S15 03 (RH front engine compartment)
CORVETTE 04 (RH engine compartment, ID 12581565)
CTS 04 Base (RH engine compartment, ID 12581565)
EXPRESS/SAVANA 1500, 2500, 3500 VAN 03 (LH rear engine compartment)
S10/S15/SONOMA 03 4.3L (RH front engine compartment)
SAFARI (GMC) 03 (LH front by battery)
SIERRA/SILVERADO 1500 PICKUP 03 4.3L (LH front under battery)
SIERRA/SILVERADO 2500 PICKUP 03 8.1L Gasoline (LH front under battery)
SIERRA/SILVERADO 3500 PICKUP 03 8.1L Gasoline (LH front under battery)
SUBURBAN 2500 03 8.1L (LH front under battery)
YUKON XL 2500 03 8.1L (LH front under battery)
Frequently Asked Questions
Frequently Asked Questions
How does the VIN programming process work?
After you complete your purchase, you will need to provide us with your vehicle’s 17-digit VIN. Our technicians use this number to access the latest GM software updates for your specific make, model, and options. We then flash this software onto the module before shipping it to you.
Is this part truly plug-and-play?
Because we program the module to your VIN, it eliminates the most complex step. For most vehicles, the only additional step required after physical installation is a simple security relearn procedure, which does not require special tools. This makes it a straightforward job for most DIY mechanics.
Will this fix my Check Engine Light?
If the Check Engine Light is caused by an internal failure of the old PCM (like code P0601), then this replacement 2003 Astro Powertrain Control Module will resolve the issue. However, if the light is on due to a faulty sensor or other component, that separate issue will still need to be addressed.
What is the difference between a PCM, ECM, and ECU?
The terms are often used interchangeably. ECU (Engine Control Unit) is a general term. ECM (Engine Control Module) typically just controls engine functions. PCM (Powertrain Control Module) is more comprehensive, managing both the engine and the transmission, which is common in most modern vehicles like the 2003 Astro.
Do I need to send my old module back?
No core charge or return is required for this part. You can recycle your old module locally.