P0347: Camshaft Position Sensor A Circuit Low Input (Bank 2)
The P0347 code indicates that the Engine Control Module (ECM) has detected a low voltage signal from the camshaft position sensor on Bank 2 (the side of the engine opposite cylinder #1). This sensor monitors the position of the camshaft relative to the crankshaft to optimize fuel injection and ignition timing. A low input means the signal voltage is below the expected range, which can disrupt engine timing and performance.
01. Most Common Causes
- Faulty camshaft position sensor (Bank 2)
- Wiring or connector issues (shorted to ground, open circuit, corrosion)
- Damaged reluctor ring or timing chain/belt issues
- ECM failure (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine may run rough, misfire, or stall
- Hard starting or no start condition
- Reduced fuel economy and power
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the sensor and wiring for damage, corrosion, or loose connections.
Step 3: Test sensor resistance and voltage output with a multimeter (compare to specs).
Step 4: Check for 5V reference and ground at the sensor connector.
Step 5: If wiring and sensor are good, inspect the reluctor ring and timing components.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The engine may stall or run poorly, leading to unsafe driving conditions. Have it diagnosed promptly.
How much does it cost to fix?▼
Typically $50-$150 for a sensor replacement, plus diagnostic fees. Labor varies by vehicle.