Code Definition

P1165 — Intake maniflld air control system vacuum check switch fault

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Infiniti

About P1165

P1165 is a manufacturer-specific powertrain diagnostic trouble code recorded for Infiniti vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

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.

P1165 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The intake manifold air control system on these Nissan and Infiniti engines uses vacuum operated actuators to move intake control valves such as the swirl or runner control valves, improving combustion and torque across the rev range. A vacuum check switch confirms that the control system is actually holding the vacuum the Engine Control Module (ECM) commands. DTC P1165 sets when the ECM detects that the vacuum check switch state does not match the commanded condition, indicating the control vacuum is not being applied or held correctly. Causes include leaking vacuum hoses, a faulty control so...

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