Why won’t my OBD2 scanner connect to my car?
Quote from AutoFixerMike on June 19, 2025, 11:19 amI tried connecting my OBD2 scanner today but it won’t link to the ECU. The scanner powers on, but keeps saying “No connection” or “Link error.” I checked my car battery — it’s good. What else can cause this issue? Could it be a blown fuse or bad OBD2 port? Would love some advice before buying a new scanner!
I tried connecting my OBD2 scanner today but it won’t link to the ECU. The scanner powers on, but keeps saying “No connection” or “Link error.” I checked my car battery — it’s good. What else can cause this issue? Could it be a blown fuse or bad OBD2 port? Would love some advice before buying a new scanner!
Quote from DIYDan on June 21, 2025, 11:27 amIt could be due to a few reasons — the ignition might not be ON, a blown fuse in the OBD2 port, or a compatibility issue between your car and the scanner. Double-check these first!
It could be due to a few reasons — the ignition might not be ON, a blown fuse in the OBD2 port, or a compatibility issue between your car and the scanner. Double-check these first!
Quote from LadyGreaseHands on June 22, 2025, 11:49 amIt’s a common issue when an OBD2 scanner won’t connect to the car. First, check if your ignition is turned ON — most scanners need the ignition in ON or RUN position to communicate.
Second, check the OBD2 port for any bent pins or dirt. Sometimes, a blown fuse (usually linked to the cigarette lighter circuit) can also cause no connection.
Another thing to consider is compatibility — not all scanners support all car protocols (like CAN, ISO9141, KWP2000, etc.). If possible, test your scanner on another car to rule out device faults.
Also, if you’re using a Bluetooth OBD2 scanner, ensure the app you are using is compatible with your car’s make and model.Hope this helps!
It’s a common issue when an OBD2 scanner won’t connect to the car. First, check if your ignition is turned ON — most scanners need the ignition in ON or RUN position to communicate.
Second, check the OBD2 port for any bent pins or dirt. Sometimes, a blown fuse (usually linked to the cigarette lighter circuit) can also cause no connection.
Another thing to consider is compatibility — not all scanners support all car protocols (like CAN, ISO9141, KWP2000, etc.). If possible, test your scanner on another car to rule out device faults.
Also, if you’re using a Bluetooth OBD2 scanner, ensure the app you are using is compatible with your car’s make and model.
Hope this helps!