P0390 on Infiniti
Camshaft Position Sensor "B" Circuit (Bank 2)
P0390 on Infiniti vehicles indicates camshaft position sensor "b" circuit (bank 2). Au7o has documented this code across 1 Infiniti model — most commonly on M37. This code means the PCM detected a circuit problem with the 'B' camshaft position sensor on Bank 2 (the cylinder bank opposite Bank 1, typically on V-type engines). This sensor monitors camshaft position so the computer can time fuel delivery, ignition, and variable valve timing accurately. A fault can lead to rough running, reduced power, hard starting, or variable valve timing problems. It is generally not an immediate breakdown but should be diagnosed to prevent driveability issues. Typical repair costs on Infiniti range from $180 to $450, depending on the specific model and root cause.
Common Causes of P0390
- •Faulty camshaft position sensor (Bank 2, sensor B)
- •Damaged wiring or connector at the sensor
- •Open or short in the sensor circuit
- •Corroded or loose connector terminals
- •Reluctor/tone ring damage on the camshaft
- •Failing PCM (less common)
P0390 on Infiniti by Model
Infiniti M37(1 issue)
- Camshaft / Crankshaft Position Sensor Failure2011-2013
The VQ37VHR engine can develop intermittent camshaft or crankshaft position sensor failures, causing hard starts, stalling, or reduced performance. Heat and age can degrade the sensors or their signal quality, and owners across Nissan/Infiniti VQ applications frequently report these failures as mileage increases.
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View P0390 across all makes →Frequently Asked Questions
What does P0390 mean on Infiniti?▼
P0390 stands for "Camshaft Position Sensor "B" Circuit (Bank 2)." This code means the PCM detected a circuit problem with the 'B' camshaft position sensor on Bank 2 (the cylinder bank opposite Bank 1, typically on V-type engines). This sensor monitors camshaft position so the computer can time fuel delivery, ignition, and variable valve timing accurately. A fault can lead to rough running, reduced power, hard starting, or variable valve timing problems. It is generally not an immediate breakdown but should be diagnosed to prevent driveability issues. On Infiniti specifically, this code is documented across 1 model.
What causes P0390 on Infiniti vehicles?▼
Common causes on Infiniti: Faulty camshaft position sensor (Bank 2, sensor B), Damaged wiring or connector at the sensor, Open or short in the sensor circuit, Corroded or loose connector terminals, Reluctor/tone ring damage on the camshaft. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0390 on a Infiniti?▼
Repair costs on Infiniti range from $180 to $450, depending on the specific model and root cause.
Which Infiniti models have P0390 documented?▼
Au7o has documented P0390 on 1 Infiniti model: M37.