Crank / Cam Sensor Range / Performance
The engine's crankshaft and camshaft sensors aren't communicating properly or their timing signals are out of sync. Think of it like two dancers who should move together but are falling out of rhythm.
The ECM monitors the relationship between crankshaft and camshaft sensor signals to verify proper engine timing and phase. If the signals drift outside expected correlation windows or arrive with incorrect frequency ratios, the ECU triggers this code. The sensors must align within strict timing tolerances for fuel injection and ignition to fire correctly.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Crank/Cam Phase Correlation | Within ±5° crankshaft degrees | Exceeds ±5° or no signal correlation |
| Sensor Signal Frequency Ratio | 2:1 (crank to cam) | Ratio deviation >10% or missing pulses |
Code P1347 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, P1347 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.