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DTC codes / Honda codes / P1788
P1788 is a Honda-specific code indicating that the transmission control module (TCM) has detected a general malfunction within the automatic transmission system, often related to solenoid performance or internal pressure issues. The TCM sets this code when it receives implausible signals from transmission sensors or when actuator response does not match commanded values.
Guidance is general and written for Honda vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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