P1600moderate severityPowertrain
ECM Battery Backup Circuit
on 2012 Toyota Matrix 2.4L I4 · FWD
What this code means
The ECM detected a loss of battery voltage at the BATT terminal.
Symptoms
- CEL
- Lost fuel trim values
- Intermittent stalling
- Difficulty starting
Common causes
- Corroded battery terminals
- Damaged EFI fuse
- Open BATT wiring
- Weak battery
Diagnostic steps
- Check battery terminals
- Test EFI fuse
- Inspect BATT wiring
- Check battery voltage
Repair notes
Clean terminals or replace fuse.
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