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DTC codes / P27xx · Transmission / P27B2
P27B2 is a manufacturer-specific code stored by the Transmission Control Module (TCM) when its internal self-test detects that the range control function is not performing as expected. The module monitors its own processor, memory, and output driver integrity, and this code means the TCM has determined that it can no longer reliably command or verify transmission range selection.
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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