C05D6Power Steering Control Module Processor Performance
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- The electric power steering controller has found that its own processor, or the cross-check between its processors, is not working as expected. Toyota documents the code as C05D604 in the ECU of the EPS steering gear: 2019–2020 RAV4 and RAV4 Hybrid light the EPS warning in red or yellow at start-up or while driving (T-SB-0061-20), and the 2022 Tundra and Lexus LX 600 log it at start-up, often together with C15D704. In each case the fix is reprogramming the gear ECU with revised logic. Many EPS units pair a main and a monitoring microcontroller that must both enable the motor relay; Mando describes such a start-up check. If the self-test fails, assist is reduced or switched off, so steering becomes heavy.
- What you may notice
- Red or yellow power steering warning lamp
- Steering suddenly heavier or assist reduced
- Fault appears mainly right after starting the vehicle
- Likely causes
- LikelyEPS controller software flags a false processor fault, update available
- PossibleSupply voltage dip during engine start disturbs the self-test
- PossibleInternal hardware fault in the steering control module
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.