P06D4
Sensor Reference Voltage E Circuit High
Generic OBD-II
Common symptoms
What you'll notice
- Check the wiring harness for any damages or loose connections.
- Inspect and replace the sensor reference voltage E circuit if necessary.
- Clean or replace the connector terminals for the sensor reference voltage E circuit.
- Clear the error codes and monitor if the error code reoccurs.
Common causes
Most likely first
- Faulty sensor reference voltage regulator
- Short or open circuit in the sensor reference voltage circuit
- Faulty engine control module (ECM) or powertrain control module (PCM)
- Malfunctioning sensor or sensor connector
- Wiring issue or loose connection in the sensor reference voltage circuit
How to diagnose & fix
Work through it in order
- Engine misfires or runs rough
- Loss of power or hesitation during acceleration
- Poor fuel economy
- Check Engine Light illuminates
- Limited or no response from throttle input
Read & clear P06D4 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.