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DTC codes / P27xx · Transmission / P27B9
P27B9 indicates that the transmission control module (TCM) has detected a performance fault or a stuck-off condition in pressure control solenoid N, which is responsible for regulating hydraulic pressure within the transmission. The TCM monitors the solenoid's electrical circuit and the resulting hydraulic response, and it sets this code when the commanded pressure does not match the actual pressure or when the solenoid fails to actuate when energized.
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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