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2019 LEXUS UX 200
2.0L I4•FWD•AUTOMATIC•gas
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Repairs0Labor476Torque3316Fluid7DTC1942Battery1Maintenance0Recalls0
P0845moderate severityPowertrain

Transmission Fluid Pressure Sensor/Switch B Circuit

on 2019 Lexus UX 200 2.0L I4 · FWD

What this code means

The PCM detected a problem in the transmission fluid pressure sensor or switch circuit B. This affects pressure monitoring and can degrade shift performance.

Symptoms

  • Erratic shifting
  • Transmission warning light
  • Possible limp mode

Common causes

  • Faulty pressure sensor B
  • Damaged wiring or connector
  • Low transmission fluid
  • Internal hydraulic fault

Diagnostic steps

  1. Retrieve fault codes and freeze frame
  2. Check fluid level and condition
  3. Inspect sensor B wiring and connector
  4. Test sensor resistance and signal
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