Hino P0563 Fault Code: VBB Fail Trouble (Highi Range)
28/02/2025
Technical Description
Abnormally high battery voltage (vehicle control ECU power supply circuit).
Dtc Set Condition
DTC Detection Condition:
Starter switch ON.
Judgment Criteria:
Vehicle control ECU power supply voltage is 16 V or more.
Reset Condition
After restoration to normal condition.
Indication, Warning Or System Control Regulation When The Dtc Is Set
− SVS light: OFF
Pre-Inspection Work
Check that the battery voltage is in the normal range.
After-Inspection Work
− Clear all past DTCs.
− Check that no DTC is detected after test drive.
Possible Causes
− Fusible Link, FUSE: Fusing, irregular contact, partial engagement
− Alternator failure (abnormal voltage or requires adjustment)
− Vehicle control ECU: Malfunction
Inspection Procedure
Troubleshooting Steps
Step 1) Read the DTC [Diagnostic Tool].
- Set the starter switch to the “LOCK” position.
- Connect the vehicle to the diagnostic tool.
- Set the starter switch to the “ON” position.
- Select [Engine ECU] and check if the DTC P0563 has been detected.
Has DTC P0563 been detected?
| Yes – Go to diagnosis procedure of DTCs in the engine ECU. | No – Go to Step 2. |
Step 2) Inspect the vehicle control ECU.
Do an inspection of the vehicle control ECU to ensure that there is no other abnormality.
Were any failures found?
| Yes – Repair or replace the failure part. Clear all past DTCs. Check that no DTC is detected after test drive. | No – Replace the vehicle control ECU. Clear all past DTCs. Check that no DTC is detected after test drive. |
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