P0346 Camshaft Position Sensor A Circuit Range/Performance (Bank 2)

P0346 points to a range or performance issue in Camshaft Position Sensor A circuit on Bank 2. The Bank 2 cam signal exists but is not plausible compared with crankshaft position or engine state.

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 replace the Bank 2 cam sensor before checking cam timing, oil control, and signal plausibility.

Symptoms of P0346

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 P0346

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

Compare Bank 2 cam signal timing, cam-crank correlation, VVT command and actual position, freeze-frame RPM, oil condition, and related cam timing codes.
Inspect sensor mounting, target wheel condition, timing chain or belt condition, phaser behavior, wiring resistance, and connector integrity.
Check whether the signal becomes implausible during startup, hot idle, acceleration, or VVT movement before replacing parts.

Related OBD-II codes

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