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DTC codes / Volkswagen codes / P1749
P1749 on Volkswagen vehicles means the Transmission Control Module (TCM) has detected that its internal coding or configuration data does not match the vehicle's expected setup. The TCM compares its stored coding against the vehicle's configuration and flags an incorrect or missing coding value, which can disable adaptive shift strategies or place the transmission in a limp-home mode.
Guidance is general and written for Volkswagen vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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