OBD-II code · Powertrain (generic)
P084B Transmission Fluid Pressure Sensor/Switch H Circuit Range/Performance
The transmission fluid pressure sensor/switch H reports a circuit range/performance fault. Hydraulic pressure feedback for shift control is unreliable on this channel.
Is it safe to drive with P084B?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySensor offset drifted
- PossibleAerated fluid affects pressure
- Less likelySensor element aged beyond calibration window
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 H, Wiring Harness, Tcm
Related codes
- P083BTransmission Fluid Pressure Sensor/Switch G Circuit Range/Performance
- P0840Transmission Fluid Pressure Sensor/Switch A Circuit Range/Performance
- P0841Transmission Fluid Pressure Sensor/Switch A Circuit Range/Performance
- P0846Transmission Fluid Pressure Sensor/Switch B Circuit Range/Performance
- P0871Transmission Fluid Pressure Sensor/Switch C Circuit Range/Performance
- P0876Transmission Fluid Pressure Sensor/Switch D Circuit Range/Performance
- P0988Transmission Fluid Pressure Sensor/Switch E Circuit Range/Performance
- P0993Transmission Fluid Pressure Sensor/Switch F 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
- P084CTransmission Fluid Pressure Sensor/Switch H Circuit Low
- P084DTransmission Fluid Pressure Sensor/Switch H Circuit High
- P084ETransmission Fluid Pressure Sensor/Switch H Circuit Intermittent
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.