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DTC codes / P26xx · Computer and output circuits / P26C3
P26C3 indicates that the transmission control module (TCM) has detected an internal performance fault in its own transmission range sensor circuit, meaning the module's self-test of the sensor signal or its processing path has failed. The TCM compares the range sensor input against expected values and sets this code when the internal reading is out of specification or inconsistent.
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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