OBD-II code · Powertrain (generic)
P0845 Transmission Fluid Pressure Sensor/Switch B Circuit
Electrical fault on the transmission fluid pressure sensor B circuit. Sensor B monitors a secondary hydraulic circuit such as a clutch line.
Is it safe to drive with P0845?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySensor failed
- PossibleWiring fault
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
- Transmission Fluid Pressure Sensor B, Wiring Harness
Related codes
- P083ATransmission Fluid Pressure Sensor/Switch G Circuit
- P084ATransmission Fluid Pressure Sensor/Switch H Circuit
- P0870Transmission Fluid Pressure Sensor/Switch C Circuit
- P0875Transmission Fluid Pressure Sensor/Switch D Circuit
- P0987Transmission Fluid Pressure Sensor/Switch E Circuit
- P0992Transmission Fluid Pressure Sensor/Switch F Circuit
- P0842Transmission Fluid Pressure Sensor/Switch A Circuit Low
- P0843Transmission Fluid Pressure Sensor/Switch A Circuit High
- P0844Transmission Fluid Pressure Sensor/Switch A Circuit Intermittent
- P0846Transmission Fluid Pressure Sensor/Switch B Circuit Range/Performance
- P0847Transmission Fluid Pressure Sensor/Switch B Circuit Low
- P0848Transmission Fluid Pressure Sensor/Switch B Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.