Restore Your Van’s Core Performance and Reliability
If your 2003 GMC Savana 2500 is giving you headaches with a persistent check engine light, erratic engine behavior, or transmission shifting problems, the root cause is often a failing Powertrain Control Module (PCM). As a technician with over two decades of experience, I’ve seen firsthand how a faulty engine computer can create a cascade of frustrating, hard-to-diagnose issues. This isn’t just an inconvenience; it affects your van’s fuel economy, emissions, and overall dependability. This replacement PCM is the definitive solution, arriving at your door programmed with the latest GM software specifically for your vehicle’s VIN.
Case Study: A Tricky Diagnosis
A customer brought in a 2003 Express van—a cousin to the Savana—with an intermittent no-start and a dashboard that would flicker randomly. They had already replaced the battery and checked the grounds. My scan tool couldn’t communicate with the PCM. After confirming the module had power and ground, it was clear the PCM itself had an internal failure. We installed a VIN-programmed module just like this one, and the van fired right up, with all communication restored. This simple swap saved the customer from days of complex wiring diagnostics and the high cost of a dealership visit.
Is Your Vehicle Showing These Symptoms?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, it’s a strong indicator that your engine computer needs replacement. Look out for common Diagnostic Trouble Codes (DTCs) like P0601 (Internal Control Module Memory Check Sum Error), P0606 (PCM Processor Fault), or various U-codes indicating a loss of communication.
- ✔ Check Engine Light is on with no clear cause
- ✔ Vehicle fails to start or starts intermittently
- ✔ Poor or declining fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Engine stalling, stumbling, or misfiring
- ✔ Failure to pass an emissions or smog test
- ✔ Scan tool cannot communicate with the PCM
A Straightforward Guide to Installation
One of the best features of this 2003 Savana 2500 PCM is that it arrives ready for installation, with no dealership programming required. For a DIYer with basic tools, this is a very manageable job. In most GM vans, the PCM is located in the engine compartment on the driver’s side.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: Find the module in the LH rear of the engine compartment. It will have several large multi-pin electrical connectors.
- Disconnect Connectors: Carefully unlatch and remove all electrical connectors from the old PCM. These connectors often have locking tabs or levers; do not force them.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware as you will need it for the new module.
- Install the New PCM: Mount the new module onto the bracket and securely fasten it.
- Reconnect Everything: Plug the electrical connectors firmly into the new PCM, ensuring all latches click into place. Reconnect the negative battery terminal.
- Perform Security Relearn (If Necessary): In many cases, the vehicle will start and run perfectly. Some GM vehicles may require a simple security relearn procedure, which typically involves cycling the key and can be done without special tools. Instructions are readily available online for your specific model.
Verified Vehicle Compatibility
This module is a direct replacement for part number 88864822 and several other service numbers. It is guaranteed to be compatible with the following vehicles and options. Please confirm your vehicle is on this list before ordering.
- ✔ 2003 SAVANA 2500 VAN – Engine Computer (LH rear engine compartment)
- ✔ 2003 EXPRESS 1500/2500/3500 VAN – Electronic Control Module; (LH rear engine compartment)
- ✔ 2003 SAVANA 1500/3500 VAN – Electronic Control Module; (LH rear engine compartment)
- ✔ 2003 SIERRA 1500 PICKUP – Electronic Control Module; (LH front under battery), w/4.3L
- ✔ 2003 SIERRA 2500/3500 PICKUP – Electronic Control Module; (LH front under battery), gasoline, 8.1L
- ✔ 2003 SILVERADO 2500/3500 PICKUP – Engine Control Module; (LH front under battery), gasoline, 8.1L
- ✔ 2003 SUBURBAN 2500 / YUKON XL 2500 – Electronic Control Module; (LH front under battery), 8.1L
- ✔ 2003 AVALANCHE 2500 – Electronic Control Module; (LH front under battery)
- ✔ 2003 ASTRO / SAFARI (GMC) – Electronic Control Module; (LH front by battery)
- ✔ 2003 BLAZER S10/JIMMY S15 – Electronic Control Module; (RH front engine compartment)
- ✔ 2003 S10/S15/SONOMA – Electronic Control Module; (RH front engine compartment), 4.3L
- ✔ 2004 CORVETTE / CTS – Electronic Control Module; (RH engine compartment), ID 12581565
Frequently Asked Questions
What information do you need from me?
After you place your order, we require your vehicle’s 17-digit Vehicle Identification Number (VIN). This allows us to program the module with the exact, correct software from GM for your specific vehicle configuration.
Is this a plug-and-play part?
Yes, this module comes pre-programmed to your VIN. In most cases, you can simply install it and the vehicle will run. Some models may require a simple, tool-free security relearn procedure that takes about 30 minutes.
Will this fix my check engine light?
If the check engine light is caused by an internal PCM failure (like DTC P0601), then yes, this part will resolve the issue. It’s crucial to properly diagnose the problem first, as the light could be on for other reasons like a bad sensor.
Where is the PCM located on my 2003 Savana Van?
On the 2003 Savana and Express vans, the PCM (or ECM) is typically located in the engine compartment, on the driver’s side, near the firewall or master cylinder.
Does this part come with a warranty?
Yes, all of our electronic modules come with a warranty. Please see the warranty tab on the product page for complete details and duration.