DTC codes / P28xx · Transmission / P2816
P2816 indicates that the transmission control module (TCM) has detected an electrical fault in the circuit for pressure control solenoid H, which is one of several solenoids that regulate hydraulic pressure inside the automatic transmission. The TCM monitors the solenoid's commanded current versus the actual current or voltage on the control circuit, and when the readings fall outside the expected range for a calibrated period, it stores this code and typically illuminates the malfunction indicator lamp (MIL).
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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