OBD-II code · Powertrain (generic)
P084A Transmission Fluid Pressure Sensor/Switch H Circuit
The transmission fluid pressure sensor/switch H reports a circuit fault. Hydraulic pressure feedback for shift control is unreliable on this channel.
Is it safe to drive with P084A?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
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
- Tfp Sensor H, Wiring Harness, Tcm
Related codes
- P083ATransmission Fluid Pressure Sensor/Switch G Circuit
- P0845Transmission Fluid Pressure Sensor/Switch B 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
- P0847Transmission Fluid Pressure Sensor/Switch B Circuit Low
- P0848Transmission Fluid Pressure Sensor/Switch B Circuit High
- P0849Transmission Fluid Pressure Sensor/Switch B Circuit Intermittent
- P084BTransmission Fluid Pressure Sensor/Switch H Circuit Range/Performance
- P084CTransmission Fluid Pressure Sensor/Switch H Circuit Low
- P084DTransmission Fluid Pressure Sensor/Switch H Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.