Battery under voltage
â–¶ How to fix
Check alternator, battery, connector and cable harness.
What you'll see
No driver-visible symptom recorded.
System reaction
The system goes into locked gear. When the voltage returns above 18V the system is returned to normal operation. For vehicles with retarder: No retarder braking is possible
Diagnostic depth
Detection
Control unit supply voltage under 18V.
Possible cause
Components or cable harnesses may be defective or have a loose connection.