Advanced Diagnostics

Advanced Diagnostics - DTC P0A94 (48): DC-DC Converter Output Low Voltage






General Description
When the DC-DC converter is operating normally, the 12 V battery voltage and the output voltage read by the motor control module (MCM) are within a specified value. When the DC-DC converter malfunctions, the 12 V battery voltage drops. When the DC-DC converter output voltage value commanded by the MCM and the 12 V battery voltage value read by the MCM are compared, and a specified voltage difference condition continues for a set time, or when the MCM receives the internal malfunction information from the DC-DC converter, a DC-DC converter malfunction is detected and a DTC is stored.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status






Enable Conditions






Malfunction Threshold
One of these conditions occur:
- The difference between the commanded DC-DC converter voltage and the MCM voltage is 2.11 V or more for at least 60 seconds.
- The MCM receives the internal malfunction information from the DC-DC converter.

Driving Pattern
1. Turn the ignition switch to ON (II).
2. Start the engine, and let it idle for at least 90 seconds.

Diagnosis Details

Conditions for setting the DTC
When a malfunction is detected, a Pending DTC, a Confirmed DTC, and the freeze data are stored in the MCM memory. The MIL does not come on.

Conditions for clearing the DTC
The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the battery.