Code Definition

P0A05 — Motor electronics coolant pump circuit open

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

About P0A05

P0A05 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 P0A05 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit.

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 P0A05 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

This DTC is set when the control module detects an open circuit condition in the motor electronics coolant pump control or feedback circuit. The coolant pump is responsible for circulating coolant through the power electronics or electric motor thermal management loop. An open circuit means the control module cannot detect proper current flow or voltage response, indicating a loss of electrical continuity.

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