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Home >> VinFast >> 2023 >> VF9 Plus >> Repair and Diagnosis (Single Page) >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Vehicle Control Diagnosis (06 Of 10) >> DTC P1121-83: Electric Power Steering (EPS) Control Module "A" - Value Of Signal Protection Calculation Incorrect >> VinFast DTC Guided Repair Instruction >> Repair Instruction

Repair Instruction

Repair Actions

  1. Check for communication faults with EPS from other ECU's and investigate faults with EPS
  2. If fault returns, check for communication faults from the CH CAN Communication BUS linking VCU and EPS and investigate faults with CH CAN Communication BUS
  3. If fault returns, check electrical circuits between VCU and EPS, repair if faulty and clear DTC
  4. If fault returns, replace EPS and clear DTC
  5. If fault returns, replace VCU and clear DTC