Camshaft Position Sensor B Circuit Malfunction
The engine's computer isn't getting a proper signal from the camshaft position sensor on bank B, like a radio losing its station. This disrupts timing and engine performance because the ECU can't sync fuel injection and ignition correctly.
The ECM monitors voltage and frequency signals from camshaft sensor B to verify camshaft rotation timing. It compares actual cam position against expected values at specific RPM and load conditions. If signal voltage remains out of range or frequency deviates beyond tolerance, a fault is logged.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Sensor Signal Voltage | 0.5–4.5V (varies by type) | <0.2V or >4.8V sustained |
| Cam Timing Correlation | Within ±5° crank angle degrees | >±8° deviation from expected |
Code P1348 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, P1348 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.