P0A1D Possible Causes
- Faulty HV control ECU
- HV control computer harness is open or short-circuited
- Poor electrical connection of the HV control computer circuit
What Does It Mean?
How to Fix P0A1D Code
Check the “possible causes” listed above. Visually inspect the cable harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
When Is P0A1D Code Detected?
The Power Management Control ECU (HV CPU) monitors its internal operation, sets DTCs, and performs safety control when it detects the following malfunctions. If any of the following DTCs are issued, replace the Power Management Control ECU (HV CPU).
P0A1D Possible Symptoms
Engine light on (or service engine soon warning light)
P0A1D Meaning
The HV control ECU performs diagnostic monitoring to check the proper operation of internal and external ECU systems. In this diagnostic monitor, the HV control ECU checks the REF signal from the main engine ECU
for errors.
If the HV control ECU detects an error in the REF signal, it will conclude that there is a malfunction in the main engine CPU, the REF signal, or the HV control ECU. The HV control ECU turns on the MIL and sets a diagnostic code (DTC).