P0563 BATTERY VOLTAGE HIGH

When Monitored and Set Condition:

When Monitored: With the key on or the engine running.
Set Condition: The battery voltage detected by the ECM is greater than a calibrated value.

POSSIBLE CAUSES

• P0622 PRESENT
• P2502 PRESENT
• P2504 PRESENT
• BATTERIES IMPROPERLY INSTALLED
• ECM
• INTERMITTENT CONDITION

DIAGNOSTIC PROCEDURE

1. With the DRBIII®, read DTCs. Is P0622 set?
   Yes --> Repair P0622 first. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
   No --> Go To 2
2. With the DRBIII®, read DTCs. Is P2502 set?
   Yes --> Repair P2502 first. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
   No --> Go To 3
3. With the DRBIII®, read DTCs. Is P2504 set?
   Yes --> Repair P2504 first. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
   No --> Go To 4
4. Disconnect the ECM harness connectors. Measure the battery voltage between the positive circuits and ground of the ECM harness connector. Is the voltage less than 19 volts?
   Yes --> Go To 5
   No --> Install the battery system correctly. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
5. Reconnect the battery terminals. Measure and record the voltage between battery positive pins of the ECM connector and the battery negative circuits of the ECM harness connector. Reconnect the ECM harness connectors. Use the DRBIII® to measure and record battery voltage. Are the readings within 3 volts of each other?
   Yes --> Refer to the SYMPTOM: INTERMITTENT CONDITION Symptom (Diagnostic Procedure). Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
   No --> Replace the ECM. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).