U0434Invalid Data Received From Active Roll Control Module
- Generic OBD-II code · Network
- Can trigger limp mode
- How the car detects it
- The active roll control module drives actuators that twist the anti-roll bars on both axles against body lean, hydraulically in older designs and electrically in newer ones. U0434 tells that a receiver, for instance the chassis or brake controller, gets this module's status or torque frames but cannot trust their content. No manufacturer documents U0434 publicly. Land Rover shows how faults of such modules surface: notice N733 for the 2022-23 Range Rover and 2023 Range Rover Sport describes front and rear ARCMs that now and then fail to initialise at start, lighting an amber suspension warning, and updates their software. If roll data is invalid, the bars will typically be left passive, so the body leans more in corners and stability functions may be limited. U0133 is lost contact.
- What you may notice
- Suspension or chassis warning in the cluster
- Noticeably more body roll in corners
- Likely causes
- PossibleRoll control module software fails to initialise reliably
- PossibleWeak supply to the roll control actuators or module
- RareInternal fault of the roll control module or actuator
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €60 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.