Camshaft Position Sensor A Circuit Range/Performance (Bank 2)
The camshaft position sensor on Bank 2 isn't sending the right signal pattern to the engine computer, like a metronome that's drifting out of time. The ECU can't properly sync fuel injection and spark timing to that cylinder bank, causing performance issues.
The ECU monitors the camshaft position sensor signal voltage and frequency to verify cam timing against crankshaft position. It compares the rising/falling edge timing and signal amplitude to expected values; if the signal arrives too early, too late, or is too weak, a range/performance fault is flagged.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Signal Frequency/Timing Correlation | Within ±5° of crankshaft reference | Deviation >5° or missing pulses |
| Signal Voltage Amplitude | 0.5–4.5 V (typical Hall/inductive) | <0.2 V or >5.0 V sustained |
Code P0346 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0346 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.