P0392 Camshaft Position Sensor B Circuit Low (Bank 2)

P0392 indicates a low input condition in Camshaft Position Sensor B circuit on Bank 2. The Bank 2 cam B signal voltage is below the expected range.

Code details

Generic OBD-II · P0

System: Ignition / Misfire
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not clear P0392 until the low input path is repaired and the signal is verified during cranking and running.

Symptoms of P0392

Rough idle, shaking, or a stumble under acceleration.
A flashing check-engine light during an active misfire.
Power loss and higher fuel consumption.

Common causes of P0392

Worn spark plugs, ignition coils, or plug wires.
Fuel-delivery problems — injectors, pressure, or a lean/rich mixture.
Vacuum leaks, low compression, or a mechanical fault in that cylinder.

Useful checks before replacing parts

Check sensor supply, ground, signal voltage, waveform amplitude, connector condition, freeze-frame RPM, and related low-input sensor codes.
Inspect for short-to-ground faults, open supply circuits, oil intrusion, damaged wiring, loose terminals, and cam target damage.
Compare readings at the sensor and controller connector to determine whether the low signal is sensor, harness, or module related.

Related OBD-II codes

These nearby ignition / misfire entries can help compare wording and pin down the fault area.