OBD-II code · Powertrain (generic, extended)
P27ED Transmission Range Control A Position Sensor/Switch Circuit Low
The position sensor or switch of transmission range control channel A reports a circuit low condition. The TCM cannot verify the actuator position reliably.
Is it safe to drive with P27ED?
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 A, Wiring Harness, Tcm
Related codes
- P27F1Transmission Range Control B Position Sensor/Switch Circuit Low
- P27EATransmission Range Control B Circuit High
- P27EBTransmission Range Control A Position Sensor/Switch Circuit/Open
- P27ECTransmission Range Control A Position Sensor/Switch Circuit Range/Performance
- 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
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.