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Home >> Lexus >> 2022 >> LS 500h AWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (W/ Advanced Park) - Diagnostic Codes (5 Of 5) & Symptom Tests >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/ Advanced Park) >> ACC Low Pressure (X21A9) [11/2021 - 10/2023] >> Description

ACC Low Pressure (X21A9) [11/2021 - 10/2023]: Description

Code Tester Display Measurement Item Trouble Area Output ECU
X21A9 ACC Low Pressure History of a continuous and significant decrease in accumulator pressure
  • Accumulator pressure dropped due to frequent brake pedal operation
  • Pump motor malfunction
  • Accumulator deterioration
  • Accumulator pressure sensor (brake booster with master cylinder assembly)
  • Supply voltage reduced
 No. 1 skid control ECU (brake booster with master cylinder assembly)
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