C1101 on Nissan: How to Diagnose & Fix
ABS System Battery/Charging Voltage High
1 Nissan model · 1 documented issue
C1101 on Nissan by model: symptoms, diagnosis and fix
The ABS/VDC control unit stores a wheel speed sensor code (C1101-C1104). Nissan's bulletin lists sensor damage, a missing sensor signal, short circuits and bent, corroded or contaminated connector pins as the things to check. 2007-2013 Nissan vehicles equipped with ABS/VDC, which includes the 2007-2012 Altima.
How to Fix
Per Nissan bulletin NTB10-102a, the technician records the active codes, clears them and road-tests above 13 mph to confirm the code returns, then checks the suspect sensor for damage, its output with a wheel sensor tester, the harness for shorts and the connectors for bent pins or corrosion before replacing anything. Nissan says not to replace a sensor based on the code alone. Normal warranty rules apply; this is not a recall or a promise of free repair. A stored code alone does not establish a failed sensor. The sensor, harness or connector repair follows the diagnostic result; do not infer that driving with a brake warning is safe.
Sources for this issue (1)
C1101 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does C1101 mean on a Nissan?
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 Nissan it is documented across 1 model: Altima.
What are the most common causes of C1101?
The most common causes of C1101 are: 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). The specific cause varies by vehicle.
How much does it cost to fix C1101 on a Nissan?
Repair costs vary widely with the root cause and Nissan model; each issue on this page carries its own estimate where one is published.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.