Code result
P27F0
Transmission Range Control B Position Sensor/Switch Circuit Range/Performance
High severity
What it means
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.
Is it safe to drive?
No — stop driving
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.
Most likely causes
Dirty or oxidised switch contacts
mediumA plausible cause — test and verify before replacing parts.
Sensor mounting misadjusted
mediumA plausible cause — test and verify before replacing parts.
Sensor element aged beyond calibration window
lowLess common, but worth ruling out after the more likely causes.
Related help
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