U058CInvalid Data Received From Active Grille Air Shutter Module C
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- A third grille shutter unit appears on vehicles that split the lower intake into several flaps. Hyundai is the clearest case: on the 2026 Palisade and Palisade Hybrid, the lower active air flaps use left and right actuators, and campaign 26-01-026H lists U028B, lost communication with shutter module C, among codes that light the engine lamp after water entered bumper connectors and corroded them. U058C covers the less drastic case where module C still sends status frames but the engine controller rejects their content. No maker publishes thresholds for U058C itself; GM's 2025 tables check counter, protection value and checksum on modules A and B (3 bad frames out of 10, Type B), a plausible pattern for C as well. With a stuck flap, warm-up and drag suffer slightly.
- What you may notice
- Check engine light on
- Active air flap warning message
- Lower flaps stay in one position
- Likely causes
- LikelyWater ingress and corrosion at the lower bumper connectors (Hyundai 26-01-026H)
- PossibleShutter actuator C with internal electronics fault
- RareActuator of wrong variant or position fitted after a bumper repair
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €650
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.