P0348 Camshaft Position Sensor A Circuit High Input (Bank 2)

P0348 points to a high input condition in Camshaft Position Sensor A circuit on Bank 2. The Bank 2 cam signal is higher than expected or stuck high.

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 cam sensor until a stuck-high signal has been checked for wiring, ground, and reference-voltage faults.

Symptoms of P0348

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 P0348

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

Review cam sensor A Bank 2 signal voltage, reference voltage, ground integrity, freeze-frame RPM, and related sensor high-input codes.
Inspect for open ground, short-to-voltage faults, connector corrosion, damaged harness insulation, sensor contamination, and target wheel issues.
Scope the cam signal during cranking and running to see whether it toggles normally or remains biased high.

Related OBD-II codes

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