Knock Sensor 2 Circuit Intermittent (Bank 2)
The knock sensor on bank 2 is sending an inconsistent or weak signal to the engine computer, like a radio that keeps cutting in and out. This prevents the ECU from properly detecting engine knock and adjusting ignition timing.
The knock sensor detects vibrations from abnormal combustion and sends voltage signals to the ECU. The ECU expects a consistent signal pattern within a specific frequency range (typically 5-15 kHz). An intermittent circuit means the signal drops in and out, triggering a fault.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Knock Sensor Signal Voltage | 0.5-4.5V AC with consistent frequency | Intermittent drops below 0.2V or signal loss for >100ms |
| Signal Frequency Stability | 5-15 kHz continuous during combustion | Frequency dropout or amplitude collapse |
Code P0335 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, P0335 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.