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DTC codes / P08xx · Transmission / P0871
P0871 indicates that the transmission control module (TCM) has detected an out-of-range or performance fault in the electrical circuit for transmission fluid pressure sensor or switch 'C'. The TCM compares the sensor's signal against expected values for the current operating conditions and flags the code when the signal is implausible, intermittent, or stuck within a valid but incorrect range.
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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