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.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
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
Common causes
Ordered by how often each turns out to be the cause.
- Dirty or oxidised switch contactsPossible
- Sensor mounting misadjustedPossible
- Sensor element aged beyond calibration windowLess likely
Parts involved
- Range Control Position Sensor B
- Wiring Harness
- TCM
P27F0 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.