Supply voltage, low
â–¶ How to fix
Check the battery. Check the voltage using SDP3 or measure the voltage level between the instrument cluster input and earth.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
The electronic control unit has detected that supply voltage is below 21 V.
Possible cause
The vehicle is started in a cold environment. The battery is in poor condition.