Powertrain
generic / SAE
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.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number7 / F1
Possible causes
- Signal wire shorted to ground high
- Internal short in position sensor medium
- Connector pins corroded - high contact resistance low
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
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
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References
sae:J2012