Code Definition

P2647 — Rocker Arm Actuator A Bank 1 Stuck On

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P2647

P2647 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P2647 is stored, the module has detected a bank-specific fault, meaning it applies only to one cylinder bank of a multi-bank engine.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P2647 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Powertrain Control Module (PCM) controls the rocker arm actuator oil control solenoid for bank 1 to engage or release the rocker arm system used for variable valve timing or cylinder deactivation. When the PCM commands the actuator off, oil pressure should drop and the rocker arm should return to its base state, which the PCM confirms through the oil pressure switch or sensor feedback. DTC P2647 is set when the PCM commands the actuator off but continues to detect oil pressure feedback or switch status indicating the actuator is still engaged for a calibrated period, meaning the rocker arm...

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