C1A47 on Lexus
Manufacturer-Specific Steering Angle / Torque Sensor Circuit (EPS)
C1A47 on Lexus vehicles indicates manufacturer-specific steering angle / torque sensor circuit (eps). Au7o has documented this code across 1 Lexus model — most commonly on IS. 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.
Common Causes of C1A47
- •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
C1A47 on Lexus by Model
Lexus IS(1 issue)
- Lexus Safety System+ False Forward Collision / PCS Warnings from Dirty or Misaligned Sensors2023-2025
Some owners report intermittent pre-collision system, radar cruise, or lane-support warnings on 2023-2025 Lexus IS models, often after heavy rain, road grime buildup, windshield contamination, or minor front-end impacts. The system may temporarily disable with a message indicating the camera or radar is unavailable, even though no permanent hardware failure exists. In other cases, sensor alignment or calibration drift after windshield or bumper work can trigger recurring warnings.
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View C1A47 across all makes →Frequently Asked Questions
What does C1A47 mean on Lexus?▼
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. On Lexus specifically, this code is documented across 1 model.
What causes C1A47 on Lexus vehicles?▼
Common causes on Lexus: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C1A47 on a Lexus?▼
Repair costs vary widely depending on the root cause and specific Lexus model.
Which Lexus models have C1A47 documented?▼
Au7o has documented C1A47 on 1 Lexus model: IS.