OBD-II code · Powertrain (generic, extended)
P27EF Transmission Range Control B Position Sensor/Switch Circuit/Open
The position sensor or switch of transmission range control channel B reports a circuit/open condition. The TCM cannot verify the actuator position reliably.
Is it safe to drive with P27EF?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyOpen in sensor signal wire
- PossiblePosition switch failed open
- Less likelyPin pushed back out of connector body
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
Related codes
- P27EBTransmission Range Control A Position Sensor/Switch Circuit/Open
- P27ECTransmission Range Control A Position Sensor/Switch Circuit Range/Performance
- P27EDTransmission Range Control A Position Sensor/Switch Circuit Low
- P27EETransmission Range Control A Position Sensor/Switch Circuit High
- P27F0Transmission Range Control B Position Sensor/Switch Circuit Range/Performance
- P27F1Transmission Range Control B Position Sensor/Switch Circuit Low
- P27F2Transmission Range Control B Position Sensor/Switch Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.