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
This is a powertrain code, so a basic OBD-II reader can read it. These read P0390.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple code reader for engine (P) codes on many compatible OBD-II vehicles. It does not support every vehicle or hybrid/EV application, and it does NOT read body, chassis or network codes; confirm exact-vehicle compatibility before buying.
- Read & clear engine (P) codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth scanner with a companion app that reads beyond the engine module — ABS, SRS and transmission — plus manufacturer-specific codes on many vehicles.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X V3.0 Elite OBD-II Scanner
by LAUNCH
Handheld scanner covering the four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level tablet with all-system coverage and bi-directional control, so you can command a module rather than only read it.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
What you can do yourself, and what needs a shop
Reading the code, clearing it, and watching whether it returns is a driveway job with the right scanner. These steps are not:
- Module programming or software updates — needs the manufacturer software or a J2534 pass-through with a paid subscription.
- Replacing a control module — most are VIN-programmed and immobilizer-registered, so a new one does nothing until it is coded to your car.
- Airbag/SRS component work — a stored fault can deploy a live device.
If the vehicle is still under warranty, check for an open recall or technical service bulletin before buying anything — the repair may already be covered.
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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.