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DTC codes / P27xx · Transmission / P27B1
P27B1 is a generic powertrain code that indicates the transmission control module (TCM) has detected an internal performance fault in its own range selection monitoring circuit. The TCM compares its commanded gear range with the actual range indicated by internal sensors and, when the two do not agree within a calibrated window, it stores this code and typically illuminates the malfunction indicator lamp.
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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