P1602 — Volkswagen — Permanent battery supply B+, terminal 30: voltage too low

P1602 records insufficient voltage on the permanent battery supply.

Meaning, symptoms, causes and checks

P1602 records insufficient voltage on the permanent battery supply. “Terminal 30” denotes unswitched battery power, not a physical pin numbered 30.

Affected system: Electrical supply

Possible causes

  • Disconnected/weak battery, faulty cables or charging-system fault.

What to check

  • Check the battery, connections and charging. Voltage codes in several modules warrant checking their common supply.