Code Definition

P0A29 — Hybrid battery power off circuit high

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

About P0A29

P0A29 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 P0A29 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 P0A29 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 or EV powertrain control module drives the high voltage battery power off control circuit, which commands the relays or contactors to isolate the high voltage battery during shutdown, a fault, or service. DTC P0A29 sets when the module detects the voltage in this control circuit is higher than the calibrated maximum threshold. A circuit high condition usually indicates an unintended voltage on the control line, often a short to a voltage source or a failed driver, which can prevent correct isolation of the high voltage system. When the code is set the vehicle may fail to enter ready...

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