C1AA6 on 2024-2025 Toyota Land Cruiser — Manufacturer-Specific EPS/Steering Control Circuit Fault
1 vehicles · 1 makes
Most Reported On
C1AA6 is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 2024-2025 Toyota Land Cruiser.
Common Causes
Diagnostic Tools
To diagnose C1AA6, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
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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- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
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- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
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Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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FAQ
What does C1AA6 mean?
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.
What are the most common causes of C1AA6?
The most common causes of C1AA6 are: 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. The specific cause varies by vehicle.
How much does it cost to fix C1AA6?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by C1AA6?
Au7o has documented C1AA6 across 1 vehicle models from 1 manufacturers: Toyota.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.