P1602 – Battery Terminal Disconnection (Toyota)

Description

The ECM detected an abnormal battery terminal disconnection event affecting power delivery and system memory.

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Symptoms

Hard starting
Loss of radio presets
ECM resets
Intermittent stalling
Warning lights on

Causes

Loose battery terminals
Corroded terminals
Weak battery
Damaged battery cables
Poor ground connection

Diagnosis

Inspect terminals
Check cable integrity
Measure battery voltage
Check ground points
Scan for related codes

Repair

Tighten terminals
Clean corrosion
Replace battery
Repair or replace cables