For many Bluetooth-enabled OBD2 scanners, especially those based on the ELM327 chip, the common default password is 1234.
Understanding OBD2 Scanner Passwords
When connecting an OBD2 scanner, particularly a Bluetooth model, to a smartphone, tablet, or computer, you might be prompted for a password or PIN. This password is a security measure for Bluetooth pairing, ensuring that only authorized devices can connect. It's important to note that not all OBD2 scanners require a password; some are Wi-Fi or USB-based and connect directly without this step.
Common Default Passwords for Bluetooth OBD2 Devices
The most frequently encountered default password for connecting ELM327-based OBD-II Bluetooth adapters to mobile devices like Android phones or tablets is 1234. However, several other common codes are used by various manufacturers.
Here are some of the widely used default passwords:
- 1234 (Most common for ELM327 devices)
- 0000
- 6789
- 12345
- 000000
Why a Password is Required
Bluetooth technology relies on a pairing process to establish a secure connection between two devices. During this process, a passkey or PIN is often exchanged to confirm the user's intent to connect and to prevent unauthorized access to the device or the vehicle's diagnostic port.
What to Do If the Default Password Doesn't Work
If the common default passwords do not allow your device to connect, consider these troubleshooting steps:
- Check the User Manual: The most reliable source for your specific scanner's default password is its user manual or the packaging it came in. Manufacturers often print this information clearly.
- Look for Labels: Sometimes, the default password is printed on a label directly on the OBD2 scanner itself.
- Try Common Alternatives: Systematically try the other common passwords listed above, such as
0000or6789. - Contact Manufacturer Support: If you've exhausted all options, reaching out to the scanner's manufacturer or vendor support can provide the exact default password or instructions for your model.
- Consider a Factory Reset: Some advanced scanners may have a factory reset option that reverts all settings, including the password, to their original defaults. Refer to your manual for this specific procedure.
Compatibility and Usage Tips
OBD2 scanners primarily communicate with diagnostic applications on smartphones or computers. When using a Bluetooth OBD2 adapter with an app, you'll typically initiate the pairing process from your device's Bluetooth settings before opening the OBD-II application. Once paired, the app should then be able to connect and retrieve vehicle data.
To summarize common default passwords:
| OBD2 Scanner Type | Common Default Passwords | Notes |
|---|---|---|
| ELM327 Bluetooth | 1234, 0000 |
Most frequently used for app connections on Android. |
| Other Generic Bluetooth | 0000, 1234, 6789 |
Standard codes for many Bluetooth pairing processes. |
| Brand-Specific Models | Varies | Always check the product's manual or manufacturer site. |
