What are the common causes of P0ADF?

A short to ground in the negative contactor control circuit. Low voltage at the negative contactor. A failed battery negative contactor coil. A weak battery cell dropping pack voltage.

Command the negative contactor and read circuit voltage. Check the negative contactor control circuit for a short to ground. Measure the negative contactor coil resistance. Test the battery pack cells for a weak cell. Replace the negative contactor if the circuit tests good. Clear the code and retest.

P0ADF

Hybrid/EV Battery Negative Contactor Control Circuit Low

System: Powertrain control (P code)
Lamp: Check Engine Light
Category: Powertrain - Hybrid Propulsion

What it means

P0ADF means Hybrid/EV Battery Negative Contactor Control Circuit Low.

Check these first

A short to ground in the negative contactor control circuit
Low voltage at the negative contactor
A failed battery negative contactor coil
A weak battery cell dropping pack voltage

What to do next

Command the negative contactor and read circuit voltage
Check the negative contactor control circuit for a short to ground
Measure the negative contactor coil resistance
Test the battery pack cells for a weak cell
Replace the negative contactor if the circuit tests good
Clear the code and retest

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Updated

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