OBD-II code · Powertrain (generic, extended)

P27F0 Transmission Range Control B Position Sensor/Switch Circuit Range/Performance

The position sensor or switch of transmission range control channel B reports a circuit range/performance condition. The TCM cannot verify the actuator position reliably.

Is it safe to drive with P27F0?

The car may go into limp mode (reduced power). Get it diagnosed before a long trip.

Common causes

  • PossibleDirty or oxidised switch contacts
  • PossibleSensor mounting misadjusted
  • 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
Range Control Position Sensor B, Wiring Harness, Tcm

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