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What does the P208400 fault code mean?

1 Answers

ZoeAnn

07/29/25 12:48pm

P208400 is a transmission fault code. Relevant information is as follows: 1. Location and function of the transmission oil pressure sensor in the vehicle: The transmission oil pressure sensor is generally installed on the internal oil circuit board of the transmission. The function of the transmission oil pressure sensor is to transmit the transmission fluid pressure to the Transmission Control Module (TCU) in the form of an electrical signal as a reference for the operation of the transmission fluid pressure control solenoid valve. 2. Explanation of the fault code: The automatic shifting of the transmission is accomplished by the coordinated action of multiple clutches and brakes, and the action of the clutches and brakes is controlled by the main oil passage pressure. The level of oil pressure determines the quality of the automatic shifting of the transmission. The function of the oil pressure sensor is to transmit the pressure signal of the main oil passage to the transmission ECU. After receiving this pressure signal, the ECU corrects the main oil passage pressure through the pressure regulating solenoid valve, thereby determining the level of the main oil passage pressure.

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