Okai Error Code 05E

"Drive upper bridge failure. Drive upper bridge MOS tube damaged or breakdown."

If your Okai-Electisan vehicle is beeping or has a red wrench icon and flashes this code, read below.

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Cause

Error code 05E indicates that the upper MOSFET (Metal Oxide Semiconductor Field-Effect Transistor) in the ECU has failed. This could be due to:

Overheating: The MOSFET might have overheated due to excessive current or a faulty cooling system.
Electrical damage: A sudden surge in voltage or a short circuit could damage the MOSFET.
Manufacturing defect: The MOSFET might have been faulty from the factory.

Replace the ECU: Since the MOSFET is part of the ECU, the entire unit needs to be replaced.