OBD-II code · Powertrain (generic)
P0847 Transmission Fluid Pressure Sensor/Switch B Circuit Low
The transmission fluid pressure sensor/switch B reports a circuit low fault. Hydraulic pressure feedback for shift control is unreliable on this channel.
Is it safe to drive with P0847?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySignal wire shorted to ground
- PossibleInternal sensor short
- Less likelyConnector pins corroded - high contact resistance
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Usually unaffected
- Parts involved
- Tfp Sensor B, Wiring Harness, Tcm
Related codes
- P083CTransmission Fluid Pressure Sensor/Switch G Circuit Low
- P0842Transmission Fluid Pressure Sensor/Switch A Circuit Low
- P084CTransmission Fluid Pressure Sensor/Switch H Circuit Low
- P0872Transmission Fluid Pressure Sensor/Switch C Circuit Low
- P0877Transmission Fluid Pressure Sensor/Switch D Circuit Low
- P0989Transmission Fluid Pressure Sensor/Switch E Circuit Low
- P0994Transmission Fluid Pressure Sensor/Switch F Circuit Low
- P0844Transmission Fluid Pressure Sensor/Switch A Circuit Intermittent
- P0845Transmission Fluid Pressure Sensor/Switch B Circuit
- P0846Transmission Fluid Pressure Sensor/Switch B Circuit Range/Performance
- P0848Transmission Fluid Pressure Sensor/Switch B Circuit High
- P0849Transmission Fluid Pressure Sensor/Switch B Circuit Intermittent
- P084ATransmission Fluid Pressure Sensor/Switch H Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.