OBD-II code · Powertrain (generic)
P0879 Transmission Fluid Pressure Sensor/Switch D Circuit Intermittent
The transmission fluid pressure sensor/switch D reports a circuit intermittent fault. Hydraulic pressure feedback for shift control is unreliable on this channel.
Is it safe to drive with P0879?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyConnector not seated
- PossibleHarness chafing intermittently
- Less likelyConnector with intermittent contact under vibration
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
- P083ETransmission Fluid Pressure Sensor/Switch G Circuit Intermittent
- P0844Transmission Fluid Pressure Sensor/Switch A Circuit Intermittent
- P0849Transmission Fluid Pressure Sensor/Switch B Circuit Intermittent
- P084ETransmission Fluid Pressure Sensor/Switch H Circuit Intermittent
- P0874Transmission Fluid Pressure Sensor/Switch C Circuit Intermittent
- P0991Transmission Fluid Pressure Sensor/Switch E Circuit Intermittent
- P0996Transmission Fluid Pressure Sensor/Switch F Circuit Intermittent
- P0876Transmission Fluid Pressure Sensor/Switch D Circuit Range/Performance
- P0877Transmission Fluid Pressure Sensor/Switch D Circuit Low
- P0878Transmission Fluid Pressure Sensor/Switch D Circuit High
- P087AClutch Position Sensor B Circuit
- P087BClutch Position Sensor B Circuit Range/Performance
- P087CClutch Position Sensor B Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.