Why can't the OBD be read at the vehicle inspection station?

1 Answers
VonMaggie
07/29/25 11:08pm
If the OBD cannot be read at the vehicle inspection station, it may be due to a malfunction of the diagnostic tool or because the diagnostic tool does not support the communication protocol of the car's ECU. In such cases, it is recommended to try using a different diagnostic tool. The ECU, known as the brain of the engine, is present in every car and is responsible for controlling the engine's operation. If the car is equipped with an automatic transmission, there will also be a TCU, which is the computer for the automatic transmission. Without the TCU, the automatic transmission cannot function properly. The TCU collects various information through sensors and, after processing, controls the transmission shifting via actuators.
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