P34AC

Symptoms

• The Check Engine light comes on
• Unstable engine idling
• Reduced engine power and response
• Increased fuel consumption
• Possible difficulty starting

Causes

• Open or short circuit in the sensor circuit
• Poor electrical contact in the sensor connector
• Malfunction of the position sensor itself
• Problems with the camshaft actuator
• In rare cases, a malfunction of the engine control unit (ECU)

How to Fix

1. Visual inspection of the sensor wiring and connectors for damage
2. Checking sensor parameters using a scanner and oscilloscope
3. Checking the reference voltage and ground in the sensor circuit
4. Replacing a faulty position sensor
5. Clean connector contacts if necessary

Related codes

Error P34AC by Vehicle Brand