P0562 BATTERY VOLTAGE LOW

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 less than a calibrated value.

POSSIBLE CAUSES

• P0622 PRESENT
• P2502 PRESENT
• P2503 PRESENT
• BATTERY TERMINAL CONNECTIONS
• ACCESSORY WIRING
• BATTERY
• HIGH RESISTANCE IN WIRE HARNESS
• 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 P2503 set?
   Yes --> Repair P2503 first. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
   No --> Go To 4
4. Visually inspect the positive and negative connections at the batteries and inspect the battery negative connections at the engine block. Are the connections free of corrosion and are they tight?
   Yes --> Go To 5
   No --> Repair the poor connections. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
5. Check for add-on or accessory wiring at positive (+) terminal of the battery Are there any damaged wires at the battery?
   Yes --> Repair accessory wiring. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
   No --> Go To 6
6. Perform battery load test using the Midtronics Micro 420 battery system tester. Did the battery(s) pass the test?
   Yes --> Go To 7
   No --> Replace the weak battery or batteries. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
7. Turn the ignition off. Disconnect the ECM harness connectors. Disconnect the battery terminals. Measure the resistance from the positive and negative battery posts to the appropriate circuits in the ECM harness connector Is the resistance less than 10 Ohms?
   Yes --> Go To 8
   No --> Repair the high resistance in the wire harness. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
8. 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).