Code Definition

P0A15 — Engine mount control circuit A low

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

About P0A15

P0A15 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 P0A15 is stored, the module has detected a signal or supply voltage lower 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 P0A15 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 that the voltage in Engine Mount Control Circuit A is below the calibrated threshold. Active engine mounts use electronically controlled components to manage vibration. A low signal typically indicates a short-to-ground condition, high resistance, or internal fault in the actuator or wiring, resulting in reduced or lost mount control functionality.

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