OBD-II code · Powertrain (generic)

P0870 Transmission Fluid Pressure Sensor/Switch C Circuit

Electrical fault on the transmission fluid pressure sensor C circuit. Sensor C typically monitors a third hydraulic clutch or band line.

Is it safe to drive with P0870?

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 C, Wiring Harness

Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.