U041CInvalid Data Received From Rocker Arm Control Module A
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- U041C relates to rocker arm control module A, the controller that switches oil-actuated rocker arms to change valve lift or shut cylinders down. The engine controller stores it when the module's lock-state or feedback frames arrive with implausible content, wrong counters or invalid values. No manufacturer documents U041C publicly, and it is open which engines use a separate module. CARB treats systems that vary valve lift or timing as monitored emission controls and asks for rationality checks of digital inputs, separate from lack-of-communication codes. Without trusted feedback the controller will usually keep all cylinders at normal lift and record the fault with the MIL; fuel use rises and running may be uneven. U011B is lost contact; module B has U041D.
- What you may notice
- Check engine light
- Cylinder deactivation or valve lift switching locked out
- Higher fuel consumption
- Likely causes
- PossibleLow oil pressure or sticking switching solenoid causing implausible lock-state feedback
- PossibleRocker arm control module A internally faulty
- RareConnector or bus wiring fault at module A
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.