OBD-II code · Powertrain (generic, extended)
P27F1 Transmission Range Control B Position Sensor/Switch Circuit Low
The position sensor or switch of transmission range control channel B reports a circuit low condition. The TCM cannot verify the actuator position reliably.
Is it safe to drive with P27F1?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySignal wire shorted to ground
- PossibleInternal short in position 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
- Range Control Position Sensor B, Wiring Harness, Tcm
Related codes
- P27EDTransmission Range Control A Position Sensor/Switch Circuit Low
- P27EETransmission Range Control A Position Sensor/Switch Circuit High
- P27EFTransmission Range Control B Position Sensor/Switch Circuit/Open
- P27F0Transmission Range Control B Position Sensor/Switch Circuit Range/Performance
- P27F2Transmission Range Control B Position Sensor/Switch Circuit High
- P27F3Clutch B Temperature Too High
- P27F4Gear Shift Lock Solenoid/Actuator A Performance/Stuck On
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.