Code Definition

P0AE0 — Hybrid Battery Negative Contactor Control Circuit High

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0AE0

P0AE0 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0AE0 is stored, the module has detected a signal or supply voltage higher than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0AE0 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The hybrid control module operates the high voltage battery system main relays, including the negative contactor (also called the negative main relay), to connect and disconnect the high voltage battery from the inverter and drive system. The module drives the negative contactor coil through a control circuit and monitors the voltage on that circuit to confirm the contactor responds to commands. DTC P0AE0 sets when the module detects the negative contactor control circuit voltage stuck high, above the calibrated threshold, which indicates an open control circuit, a circuit shorted to a voltage...

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