OBD-II code · Powertrain (generic)
P0878 Transmission Fluid Pressure Sensor/Switch D Circuit High
The transmission fluid pressure sensor/switch D reports a circuit high fault. Hydraulic pressure feedback for shift control is unreliable on this channel.
Is it safe to drive with P0878?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySignal wire shorted to B+
- PossibleOpen sensor
- 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 D, Wiring Harness, Tcm
Related codes
- P083DTransmission Fluid Pressure Sensor/Switch G Circuit High
- P0843Transmission Fluid Pressure Sensor/Switch A Circuit High
- P0848Transmission Fluid Pressure Sensor/Switch B Circuit High
- P084DTransmission Fluid Pressure Sensor/Switch H Circuit High
- P0873Transmission Fluid Pressure Sensor/Switch C Circuit High
- P0990Transmission Fluid Pressure Sensor/Switch E Circuit High
- P0995Transmission Fluid Pressure Sensor/Switch F Circuit High
- P0875Transmission Fluid Pressure Sensor/Switch D Circuit
- P0876Transmission Fluid Pressure Sensor/Switch D Circuit Range/Performance
- P0877Transmission Fluid Pressure Sensor/Switch D Circuit Low
- P0879Transmission Fluid Pressure Sensor/Switch D Circuit Intermittent
- P087AClutch Position Sensor B Circuit
- P087BClutch Position Sensor B Circuit Range/Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.