Volvo TAD650VE - MID 128, Pid 158; Battery Voltage

Diagnostic Trouble Codes Group 30: Electrical system
76
MID 128, PID 158
Battery voltage
MID 128: Engine control unit
FMI 1: The sensor value is valid but below the nor-
mal working range.
FMI Fault code explanation
1 Bellow range
Fault indication
DCU: Engine warning in DCU display.
CIU: Flash code
Flash code
Electrical fault: None (EMS)
Value fault: 3.9 (EMS)
Electrical fault: None (CIU)
Value fault: 6.9 (CIU)
Symptom
Could be engine starting problems.