What are the common causes of P06D2?

An open in the reference E feed wire. A short in the E circuit. A corroded E circuit connector. A failed sensor on the E circuit. A faulty ECM.

Check the 5 volt reference on the E circuit. Inspect the wiring and connectors. Unplug sensors one at a time on the E circuit. Test the ECM reference output. Repair the wiring or replace the ECM. Clear the code and retest.

P06D2

Sensor Reference Voltage E Circuit/Open

System: Computer output circuits (P code)
Lamp: Check Engine Light
Category: Powertrain - Computer and Auxiliary Controls

What it means

P06D2 means Sensor Reference Voltage E Circuit/Open.

Where it lives

For P06D2, the circuit described runs through the sensor. The description of P06D2 reports the sensor as open.

Check these first

An open in the reference E feed wire
A short in the E circuit
A corroded E circuit connector
A failed sensor on the E circuit
A faulty ECM

What to do next

Check the 5 volt reference on the E circuit
Inspect the wiring and connectors
Unplug sensors one at a time on the E circuit
Test the ECM reference output
Repair the wiring or replace the ECM
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.