C1AA6 on Toyota
Manufacturer-Specific EPS/Steering Control Circuit Fault
C1AA6 on Toyota vehicles indicates manufacturer-specific eps/steering control circuit fault. Au7o has documented this code across 1 Toyota model — most commonly on Land Cruiser. C1AA6 is an obscure manufacturer-specific chassis trouble code, generally within the Electric Power Steering or steering-control code family. It indicates the steering control module detected an electrical or signal fault it considers out of specification. The exact definition is set by the vehicle manufacturer and could not be confirmed against a public standard, so it should be read at the system level: a steering-system sensor, motor, or wiring problem. Symptoms commonly include reduced or inconsistent power steering assist and a steering or warning light.
Common Causes of C1AA6
- •Wiring or connector fault in the steering control circuit
- •Faulty steering sensor (angle or torque)
- •EPS motor or control module internal fault
- •Low or unstable supply voltage
- •Poor ground or corroded connector
- •Module software/calibration fault
C1AA6 on Toyota by Model
Toyota Land Cruiser(1 issue)
- Driver Assistance False Alerts and Temporary Sensor Blockage Warnings in Rain, Dust, or Snow2024-2025
Owners have reported Toyota Safety Sense warnings, unavailable adaptive cruise, and intermittent pre-collision or lane-keeping alerts when the radar or camera becomes obstructed by weather, road film, or dust. While some level of sensor blockage is expected, complaints indicate the system can become unavailable sooner than expected in real-world conditions, especially on dirty winter roads or off-pavement use. The result is nuisance warnings and loss of driver-assist features until the sensors clear.
Looking for C1AA6 on a different make?
View C1AA6 across all makes →Frequently Asked Questions
What does C1AA6 mean on Toyota?▼
C1AA6 stands for "Manufacturer-Specific EPS/Steering Control Circuit Fault." C1AA6 is an obscure manufacturer-specific chassis trouble code, generally within the Electric Power Steering or steering-control code family. It indicates the steering control module detected an electrical or signal fault it considers out of specification. The exact definition is set by the vehicle manufacturer and could not be confirmed against a public standard, so it should be read at the system level: a steering-system sensor, motor, or wiring problem. Symptoms commonly include reduced or inconsistent power steering assist and a steering or warning light. On Toyota specifically, this code is documented across 1 model.
What causes C1AA6 on Toyota vehicles?▼
Common causes on Toyota: Wiring or connector fault in the steering control circuit, Faulty steering sensor (angle or torque), EPS motor or control module internal fault, Low or unstable supply voltage, Poor ground or corroded connector. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C1AA6 on a Toyota?▼
Repair costs vary widely depending on the root cause and specific Toyota model.
Which Toyota models have C1AA6 documented?▼
Au7o has documented C1AA6 on 1 Toyota model: Land Cruiser.