C1A47 on 2023-2025 Lexus IS — Manufacturer-Specific Steering Angle / Torque Sensor Circuit (EPS)
1 vehicles · 1 makes
Most Reported On
C1A47 is an OBD-II diagnostic trouble code meaning “Manufacturer-Specific Steering Angle / Torque Sensor Circuit (EPS).” C1A47 is a manufacturer-specific chassis code generally tied to the Electric Power Steering system, commonly involving the steering angle or steering torque sensor circuit. The power steering ECU relies on these sensors (and often the clock spring/spiral cable connection) to know how far and how hard the driver is turning the wheel; this code sets when that signal is missing, implausible, or out of range. The precise definition varies by manufacturer. When set, power steering assist may be reduced and steering can feel heavier than normal. This code is most commonly reported on 2023-2025 Lexus IS.
Common Causes
Diagnostic Tools
To diagnose C1A47, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
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A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
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Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
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LAUNCH CRP123X OBD-II Scanner
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Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
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FAQ
What does C1A47 mean?
C1A47 stands for "Manufacturer-Specific Steering Angle / Torque Sensor Circuit (EPS)." C1A47 is a manufacturer-specific chassis code generally tied to the Electric Power Steering system, commonly involving the steering angle or steering torque sensor circuit. The power steering ECU relies on these sensors (and often the clock spring/spiral cable connection) to know how far and how hard the driver is turning the wheel; this code sets when that signal is missing, implausible, or out of range. The precise definition varies by manufacturer. When set, power steering assist may be reduced and steering can feel heavier than normal.
What are the most common causes of C1A47?
The most common causes of C1A47 are: Faulty steering angle or torque sensor, Damaged clock spring / spiral cable in the steering column, Connector or wiring fault at the steering sensor, Sensor calibration lost after battery or steering work, Failed EPS control module, Steering angle sensor not zeroed/initialized. The specific cause varies by vehicle.
How much does it cost to fix C1A47?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by C1A47?
Au7o has documented C1A47 across 1 vehicle models from 1 manufacturers: Lexus.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.