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2012 TESLA MODEL S
85 kWh Single Motor RWD•RWD•AUTOMATIC•ev
8 active safety recalls on this vehicle — view recalls
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Repairs0Labor315Torque3006Fluid5DTC1472Battery1Maintenance0Recalls8
P0994low severityPowertrain

Refrigerant Pressure Sensor B Circuit Low

on 2012 Tesla Model S 85 kWh Single Motor RWD · RWD

What this code means

The refrigerant pressure sensor B circuit is reading a voltage below the normal range. This usually points to a wiring short or a failed sensor.

Symptoms

  • A/C not cooling properly
  • A/C compressor disengaged
  • Erratic climate control

Common causes

  • Short to ground in signal wire
  • Faulty refrigerant pressure sensor
  • Corroded connector
  • Failed HVAC control module

Diagnostic steps

  1. Scan and record freeze frame data
  2. Inspect sensor connector for damage
  3. Check signal wire for short to ground
  4. Replace sensor if signal remains low
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