P1600moderate severityPowertrain
ECM Battery Backup Circuit
on 2005 Toyota 4Runner 4.0L V6 · RWD
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.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1