ELM327 Troubleshooting

Published on November 19, 2015 by Nick

These are some of the most common problems with ELM327 interfaces and how to diagnose them.

Problem Solution
ECU Connection Failed Make sure the vehicle is running or that the ignition switch is providing power to the vehicle; Make sure the scanner is connected to the interface you are using (ie. laptop or smartphone); Try connecting to another vehicle
Error Detecting OBD-II Protocol Make sure the vehicle is running or that the ignition switch is providing power to the vehicle; Make sure the scanner is connected to the interface you are using (ie. laptop or smartphone); Try connecting to another vehicle
No Connection to ECU Make sure the vehicle is running or that the ignition switch is providing power to the vehicle; Make sure the scanner is connected to the interface you are using (ie. laptop or smartphone); Try connecting to another vehicle
No Response from ECU Make sure the vehicle is running or that the ignition switch is providing power to the vehicle; Make sure the scanner is connected to the interface you are using (ie. laptop or smartphone); Try connecting to another vehicle
No Wifi SSID Make sure the vehicle is running or that the ignition switch is providing power to the vehicle; Make sure that a red light is illuminated on the scanner; Be sure that Wi-Fi is enabled on your device (ie. laptop or smartphone)
Not Connecting Check that the vehicle has power and a red light is illuminated on the scanner; Be sure that Bluetooth or WiFi is enabled on the receiving device (ie. laptop or smartphone)
Not Pairing Be sure that Bluetooth is Enabled and the Pairing Code is Correct
Red Light Only This is a sign that the scanner is receiving power; Connect to the scanner via Bluetooth or Wifi
Unable to Connect Be sure that the vehicle is running, a red light is illuminated on the scanner and that Bluetooth or WiFi is enabled on the receiving device (ie. laptop or smartphone)

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