Fuel Level Sensor B Intermittent/Bypass Line Monitor
Your car's backup fuel level sensor is sending inconsistent signals, like a radio that keeps cutting in and out. The engine computer detected a problem with the secondary fuel gauge circuit or its wiring.
The ECU monitors voltage signals from the secondary fuel level sensor (Sensor B) and compares them against expected resistance ranges. When signal voltage fluctuates beyond normal thresholds or drops intermittently, the ECU flags an intermittent circuit fault, suggesting a loose connection, corroded contact, or faulty sensor.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Sensor B Voltage | 0.5V to 4.5V (stable) | Intermittent drops below 0.2V or above 4.8V |
| Signal Consistency | Smooth transition over 2-3 seconds | Rapid fluctuations or dropouts within 500ms |
Code P1355 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, P1355 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.