P0390 on 2011-2013 Infiniti M37 — Camshaft Position Sensor "B" Circuit (Bank 2)
1 vehicles · 1 makes · $180-$450 repair
Most Reported On
P0390 is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 2011-2013 Infiniti M37, with repair costs ranging from $180 to $450.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0390, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
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A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
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BlueDriver Pro Bluetooth Scanner
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Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
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LAUNCH CRP123X OBD-II Scanner
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Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
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FAQ
What does P0390 mean?
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.
What are the most common causes of P0390?
The most common causes of P0390 are: 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). The specific cause varies by vehicle.
How much does it cost to fix P0390?
Repair costs for P0390 range from $180 to $450, depending on the vehicle and root cause.
Which vehicles are affected by P0390?
Au7o has documented P0390 across 1 vehicle models from 1 manufacturers: Infiniti.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.