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, which is critical for proper fuel injection and ignition timing. A low input means the signal voltage is below the expected range, often due to a faulty sensor, wiring issues, or a problem with the sensor's power or ground circuit.
1. Most Common Causes
- Faulty camshaft position sensor (Bank 2)
- Open or shorted wiring in the sensor circuit
- Poor electrical connection at the sensor connector
- Damaged reluctor ring or timing chain issues
- Failed ECM (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine may run rough or misfire
- Hard starting or no start condition
- Reduced fuel economy and performance
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for other related codes.
Step 2: Visually inspect the camshaft position sensor connector and wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's power supply (typically 5V reference) and ground circuit using a multimeter.
Step 4: Measure the sensor's signal voltage while cranking the engine; it should pulse between 0-5V.
Step 5: If signal is missing or low, replace the camshaft position sensor on Bank 2.
Step 6: Clear the code and test drive to verify repair.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code, as it can cause poor engine performance, stalling, or no-start conditions. Immediate diagnosis and repair are advised.
How much does it cost to fix?▼
The typical repair cost ranges from $50 to $150 for parts and labor, depending on the vehicle and shop rates. DIY replacement of the sensor is often under $50.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.