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DTC codes / P27xx · Transmission / P27B6
P27B6 is set when the transmission control module (TCM) detects an internal fault in its own processing of the transmission speed sensor signal, not a problem with the sensor itself. The module compares the speed sensor input against expected values and its own internal calculations, and when the two do not agree it stores this code because the error lies inside the module's circuitry.
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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