Nissan
ABS/VDC unit supply voltage too low (under about 10 V) or too high (over about 16 V). Often set by a weak battery or charging fault.
C1109 fault code: what it means
C1109: ABS/VDC unit supply voltage too low (under about 10 V) or too high (over about 16 V). Often set by a weak battery or charging fault.
Usual causes, most likely first
- weak or flat battery
- alternator over- or under-charging
- ABS fuse, wiring or earth fault
- ABS actuator/control unit
C1109 by make
What the repair usually costs
- 12 V battery replace, standard flooded (small / medium car)NZ$190–NZ$330 · A$170–A$310
- 12 V battery replace, standard flooded (SUV / ute / 4WD)NZ$290–NZ$500 · A$270–A$460
- Hybrid 12 V auxiliary battery (Aqua / Prius C / Axio, S34B20R)NZ$330–NZ$510 · A$310–A$500
Not sure what C1109 means on your car? Ask Credov.
Before you clear it
Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.
Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.