C1103 on 2007-2013 Nissan Altima — ABS/Brake System Circuit Fault (manufacturer-specific)
1 vehicles · 1 makes
How to diagnose and fix C1103: most-reported vehicles
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Nissan Altima · 2007–2013
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)
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C1103 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 C1103 mean?
C1103 stands for "ABS/Brake System Circuit Fault (manufacturer-specific)." This is a chassis code set by the ABS/brake control module, and its precise meaning is manufacturer-specific. On many vehicles it refers to a fault in an ABS-related circuit such as the hydraulic brake switch or a wheel-speed/control circuit, while some makes (for example certain Mercedes-Benz) assign it to a specific axle circuit. In general it indicates the ABS module found an electrical problem in a brake-system input or control circuit, which can disable anti-lock braking and stability features. Because braking-related faults affect safety, it should be diagnosed against the correct service information for the specific make.
What are the most common causes of C1103?
The most common causes of C1103 are: Faulty hydraulic brake/pressure switch (on applicable makes), Wheel-speed sensor or related circuit fault, Damaged, corroded, or open wiring/connectors, Poor grounds or low supply voltage to ABS module, Internal ABS/EBCM module failure, Manufacturer-specific axle/sensor circuit fault. The specific cause varies by vehicle.
How much does it cost to fix C1103?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by C1103?
Au7o has documented C1103 across 1 vehicle models from 1 manufacturers: Nissan.
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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.