DTC codes / Mazda codes / P1776
P1776 on Mazda vehicles means the transmission control module (TCM) has detected an abnormal condition on the torque down signal 2 circuit, which is the communication line the TCM uses to request a momentary reduction in engine torque during gear shifts. The TCM monitors the circuit for open, short, or out-of-range voltage and sets this code when the signal does not match expected values during a shift event.
Guidance is general and written for Mazda vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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