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DTC codes / P27xx · Transmission / P27EF
P27EF indicates that the transmission control module (TCM) has detected an open circuit or invalid signal from the 'B' position sensor or switch within the transmission range control system. This sensor reports the physical position of the gear selector or internal shift mechanism, and an open circuit means the TCM cannot verify that the transmission is in the commanded range.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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