C1103moderate severityChassis
Power Supply Voltage Low
on 2024 Subaru Impreza 2.0L H4 · AWD
What this code means
The ABS module sees system voltage below the acceptable range. Commonly caused by a weak battery or poor connections.
Symptoms
- ABS warning light on
- ABS disabled at low voltage
- Hard cranking or dim lights
Common causes
- Weak or discharged battery
- Corroded battery terminals
- Failing alternator
- Poor ground connection
Diagnostic steps
- Load test battery
- Check charging system output
- Inspect grounds and connections
- Repair power supply or charging fault
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Other Chassis codes on this vehicle
C0021
LF Wheel Speed Sensor Range/Performance
C0022
RF Wheel Speed Sensor Range/Performance
C0023
LR Wheel Speed Sensor Range/Performance
C0024
RR Wheel Speed Sensor Range/Performance
C0025
LF Wheel Speed Sensor Circuit Intermittent
C0026
RF Wheel Speed Sensor Circuit Intermittent
C0027
LR Wheel Speed Sensor Circuit Intermittent
C0028
RR Wheel Speed Sensor Circuit Intermittent
C0035
Left Front Wheel Speed Sensor Circuit
C0036
Left Front Wheel Speed Signal Erratic