The 2003 Pontiac Grand Am’s theft deterrent system, also known as Passlock, can sometimes trigger an OBD2 error and prevent the engine from starting. This often happens after replacing components like the Passlock sensor, Body Control Module (BCM), or Powertrain Control Module (PCM). If you’re facing this issue, a relearn procedure is necessary to reset the system and get your Grand Am running again. This guide outlines the two key relearn procedures: the 10-minute procedure using a Tech 2 scanner and the 30-minute procedure that doesn’t require any special tools.
Understanding the 2003 Grand Am’s Theft Deterrent System
The Passlock system is designed to prevent unauthorized starting of the vehicle. It utilizes a sensor in the ignition cylinder to verify the correct key is being used. When the system detects a mismatch or a fault, it can trigger the SECURITY light on the dashboard and prevent the engine from cranking or starting. This can manifest as an OBD2 error code related to the theft deterrent system. Replacing related components often necessitates a relearn procedure to synchronize the new parts with the system.
10-Minute Relearn Procedure with Tech 2
This procedure requires a Tech 2 scan tool and a Techline terminal with current Service Programming System (SPS) software.
- Connect and Request Information: Connect the Tech 2 to the vehicle’s OBD2 port. Navigate to “Service Programming” and select “Request Information.”
- Connect to Techline Terminal: Disconnect the Tech 2 from the vehicle and connect it to the Techline terminal. In the SPS software on the terminal, choose “Theft Module Re-Learn” under “Service Programming.”
- Initiate VTD Re-Learn: Disconnect the Tech 2 from the terminal and reconnect it to the vehicle. Turn the ignition ON without starting the engine. On the Tech 2, select “VTD Re-Learn” under “Service Programming.”
- Crank Attempt: Attempt to start the engine and then release the key back to the ON position. The engine will not start at this point.
- Observe SECURITY Light: Observe the SECURITY telltale on the dashboard. It should turn OFF after approximately 10 minutes, indicating the system is ready to relearn.
- Ignition Cycle: Turn the ignition OFF and wait 5 seconds.
- Start the Engine: Turn the ignition ON and start the engine. The system should now have learned the new Passlock data.
- Clear DTCs: Using the Tech 2, clear any Diagnostic Trouble Codes (DTCs) related to the theft deterrent system.
30-Minute Relearn Procedure (No Tools Required)
This procedure does not require any special tools and can be performed by anyone.
- Ignition ON, Engine OFF: Turn the ignition ON without starting the engine.
- Crank Attempt: Try to start the engine and then release the key back to the ON position. The engine will not start.
- 10-Minute Wait: Wait for the SECURITY light to turn OFF (approximately 10 minutes).
- Ignition Cycle: Turn the ignition OFF and wait 5 seconds.
- Repeat Cycles: Repeat steps 1 through 4 two more times for a total of three cycles (30 minutes).
- Final Start: After the third cycle, turn the ignition ON and start the engine. The system should now be relearned.
- Clear DTCs: If a scan tool is available, clear any DTCs. If not, history DTCs will clear automatically after 100 ignition cycles.
Important Considerations
- BCM and PCM Replacement: The relearn procedures are particularly critical after replacing the BCM or PCM. These modules store crucial information for the theft deterrent system.
- Tech 2 and Techline Terminal: The 10-minute procedure may be necessary in some cases to force the BCM into relearn mode, especially after module replacement. These tools are generally available at professional automotive repair shops.
- Patience is Key: Ensure you follow the timing requirements precisely in both procedures. Interrupting the process can lead to unsuccessful relearning.
Conclusion
Resolving a “2003 Grand Am Obd2 Error Out” related to the theft deterrent system usually involves performing a relearn procedure. Depending on the situation and available tools, either the 10-minute or 30-minute procedure can be used. Understanding these procedures can help you get your Grand Am back on the road quickly and avoid unnecessary trips to the mechanic. If you encounter persistent issues, consult a qualified automotive technician for further diagnosis and repair.
