A P0271 code on your 2020 Infiniti Q50 indicates a high voltage condition in the cylinder 4 fuel injector circuit. Whether your Q50 has the 3.0L twin-turbo V6 or 2.0L turbo four-cylinder, this code identifies a specific cylinder needing attention.
Q50 Engine Variants
The 2020 Q50 offers the 3.0L twin-turbo VR30DDTT V6 (300 or 400 hp depending on tune) or the 2.0L turbo four-cylinder. The V6 uses direct injection while the four-cylinder uses a different injection strategy. Cylinder 4 location varies by engine configuration.
High Circuit Interpretation
High voltage indicates an open circuit—current isn't flowing through the injector. This occurs when the injector connector is disconnected, the wiring has a break, or the injector coil has failed open internally. The ECM commands the injector but sees no current draw, leaving voltage high.
Diagnostic Approach
Identify your engine and locate cylinder 4 accordingly. For the V6, cylinders are numbered 1-3 on passenger side, 4-6 on driver side. Check the injector connector for proper seating. Measure injector resistance—infinite reading indicates open coil. Test wiring continuity through the circuit.
Repair Path
Open injectors require replacement. The V6's direct injection system needs fuel system depressurization before injector removal. If wiring is damaged, locate and repair the break. Use quality connections rated for automotive underhood conditions. Verify repair with scan tool monitoring of injector operation.