DC / DC Converter Status Circuit
Table of contents
P0A08 TOYOTA Possible Causes
- Wire harness or connector
- Inverter water pump assembly
- Inverter cooling system
- Hybrid vehicle transaxle assembly
- Generator cable
- Motor cable
- Frame wire
- Inverter with converter assembly
- Fusible link block assembly (MAIN)
- Fuse (DC/DC-S, IGCT, IGCT No. 2)
- Fusible link block assembly (DC/DC)
How do I fix code P0A08 TOYOTA?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P0A08 TOYOTA code
The cost of diagnosing the P0A08 TOYOTA code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0A08 TOYOTA Description
The hybrid vehicle converter (DC/DC converter) converts the DC 201.6 V of the HV battery into DC 12 V in order to supply power to areas such as the vehicle’s lighting, audio, and ECU systems. In addition, it charges the auxiliary battery. A transistor bridge circuit initially converts DC 201.6 V into alternating current, and a transformer lowers its voltage. Then, it is rectified and smoothed (into DC) and converted into DC 12 V. The hybrid vehicle converter controls the output voltage in order to keep a constant voltage at the terminals of the auxiliary battery.
The power management control ECU (HV CPU) uses the NODD signal line to transmit a stop command to the hybrid vehicle converter and receive signals indicating the normal or abnormal condition of the 12 V charging system. If the vehicle is being driven with an inoperative hybrid vehicle converter, the voltage of the auxiliary battery will drop, which will prevent the continued operation of the vehicle. Therefore, the power management control ECU (HV CPU) monitors the operation of the hybrid vehicle converter and alerts the driver if it detects a malfunction.