P0343 Fault Code

Camshaft Position Sensor Circuit High Input

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0343 fault code indicates that there is a high input signal from the camshaft position sensor circuit. This sensor plays a critical role in the engine management system by providing the engine control unit (ECU) with the position of the camshaft, which is vital for timing the fuel injection and ignition. A high input signal suggests that the voltage reading from the sensor is exceeding the normal operating range, which may cause engine performance issues.

What are the symptoms of the P0343 code?

• Engine misfires or runs rough
• Difficulty starting the engine
• Decreased fuel efficiency
• Illuminated check engine light
• Possible stalling or lack of power during acceleration

What causes the P0343 code?

• Faulty camshaft position sensor
• Electrical issues, such as short circuits or open circuits in the wiring
• Poor connections or corroded terminals in the sensor circuit
• Malfunctioning engine control unit (ECU)
• Timing belt or chain issues that affect the camshaft position

How to fix P0343?

• Inspect the camshaft position sensor and wiring for damage or wear
• Test the sensor with a multimeter to ensure it is functioning within specifications
• Check for loose or corroded connections and repair as necessary
• Replace the camshaft position sensor if it is found to be faulty
• Clear the fault codes and perform a test drive to ensure the issue is resolved