Camshaft Position Sensor B Circuit Intermittent (Bank 2)
The engine computer is having trouble reliably detecting the position of the camshaft on Bank 2 (the side opposite the #1 cylinder). Think of it like a light switch that keeps flickering on and off instead of staying solid.
The ECM monitors voltage signals from the camshaft position sensor B on Bank 2 to track valve timing. It expects a consistent signal pattern synchronized with crankshaft rotation. Intermittent faults occur when the signal drops out momentarily or becomes erratic, indicating a loose connection, corroded terminal, or failing sensor.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Sensor Signal Voltage | 0.5–4.5V (steady digital or analog signal) | Voltage dropout, noise, or loss of signal continuity |
| Signal Frequency/Timing | Synchronized with engine RPM and crankshaft position | Intermittent signal loss or erratic timing deviation |
Code P0396 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, P0396 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.