C1101 on Hyundai
ABS System Battery/Charging Voltage High
C1101 on Hyundai vehicles indicates abs system battery/charging voltage high. Au7o has documented this code across 1 Hyundai model — most commonly on Sonata. This is a chassis (ABS/stability control) code indicating the anti-lock brake or electronic stability module detected battery/charging system voltage outside its acceptable range, typically too high. The ABS module monitors supply voltage because it needs stable power to operate the pump and solenoids safely; out-of-range voltage can make it disable ABS/traction features as a precaution. On most makes this points to a charging-system problem rather than a brake fault, though the exact wording can vary by manufacturer.
Common Causes of C1101
- •Overcharging alternator / faulty voltage regulator
- •Weak, failing, or corroded battery
- •Loose or corroded battery terminals and ground straps
- •Poor connections at the ABS module power feed
- •Damaged charging-system wiring
- •Faulty ABS/EBCM module (less common)
C1101 on Hyundai by Model
Hyundai Sonata(1 issue)
- MDPS / Electronic Power Steering (EPS) sudden assist loss and steering lockup2015-2017
The Motor-Driven Power Steering (MDPS) unit can fail, illuminating the EPS warning light and causing sudden loss of power assist or a steering wheel that becomes very tight/hard to turn - sometimes during low-speed maneuvers (parking, tight turns) and sometimes at highway speed (~35 mph). Owners report having to stop, shift to park, and restart the engine to clear the light, and that the wheel can briefly 'lock' or require very high effort. Root causes traced to the MDPS module/motor, wiring-harness connections, or the steering-angle sensor. Hyundai issued a warranty extension covering the MDPS/EPS unit for EPS-warning-light illumination on 2016-2017 model-year vehicles from 5yr/60,000 mi to 15yr/150,000 mi.
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View C1101 across all makes →Frequently Asked Questions
What does C1101 mean on Hyundai?▼
C1101 stands for "ABS System Battery/Charging Voltage High." This is a chassis (ABS/stability control) code indicating the anti-lock brake or electronic stability module detected battery/charging system voltage outside its acceptable range, typically too high. The ABS module monitors supply voltage because it needs stable power to operate the pump and solenoids safely; out-of-range voltage can make it disable ABS/traction features as a precaution. On most makes this points to a charging-system problem rather than a brake fault, though the exact wording can vary by manufacturer. On Hyundai specifically, this code is documented across 1 model.
What causes C1101 on Hyundai vehicles?▼
Common causes on Hyundai: Overcharging alternator / faulty voltage regulator, Weak, failing, or corroded battery, Loose or corroded battery terminals and ground straps, Poor connections at the ABS module power feed, Damaged charging-system wiring. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C1101 on a Hyundai?▼
Repair costs vary widely depending on the root cause and specific Hyundai model.
Which Hyundai models have C1101 documented?▼
Au7o has documented C1101 on 1 Hyundai model: Sonata.