C0559Power Steering Control Module Range/Performance – Rear
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C0559 covers the rear steering controller, the electronics of active rear-wheel steering, when it fails its own performance or plausibility checks. Systems such as ZF's AKC turn the rear wheels by up to 12° opposite to the front ones at low speed and in the same direction from about 60 km/h. No maker documents C0559 publicly, but the faults are known under other codes: Bentley logs P060700 (control module performance) in the rear axle steering unit J1019 and checks damage, ground point 710, replaces the rack and realigns; Audi updates J1019 software for C12A329 and asks for an alignment; on the 2017 Q7 a sensor signal discrepancy lit the steering lamp. A Mazda patent compares three position detectors, uses the agreeing pair and returns the wheels to centre. The car then drives like one without rear steering.
- What you may notice
- Steering or rear steering warning in the instrument cluster
- Larger turning circle, rear wheels held straight
- Driver assistance functions limited on some models
- Likely causes
- LikelyRear steering control module software fault (update available)
- PossibleDisagreeing position or angle signals inside the rear steering actuator
- PossiblePoor ground or supply of the rear steering unit
- RareDamaged, contaminated or worn rear steering actuator
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.