Code Definition

P1140 — Left side Camshaft position actuator or sensor fault

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

About P1140

P1140 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.

When P1140 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

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.

P1140 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

This code relates to the camshaft position monitoring and valve timing actuation on the left side cylinder bank of these Nissan and Infiniti engines. The Engine Control Module (ECM) uses a camshaft position sensor to track the actual position of the camshaft and commands the valve timing control actuator to advance or retard it. DTC P1140 sets when the ECM detects a fault with either the left side camshaft position sensor signal or the timing control actuator response, such as a missing or erratic cam signal or a failure of the cam to reach the commanded phase. Symptoms can include rough idle,...

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