U0405Invalid Data Received From Cruise Control Module
- 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
- Today the module behind this code is usually the distance radar of adaptive cruise, the unit that asks the engine controller for speed and torque changes. U0405 is set when those requests arrive but fail the receiver's integrity checks. Saab's 2011 code list breaks it down into sub-codes 71 (invalid data), 72 (message counter) and 74 (checksum). Stellantis documents it on the 3.0 L Hurricane six: 2025 Ram 1500 (TSB 18-071-24) and 2023 Wagoneer/Grand Wagoneer (18-076-25) store U0405 together with U0104 as permanent codes with MIL, and the bulletins call the detection false; new PCM software lets the codes clear on their own, which matters where emissions inspections read the MIL. Expect adaptive cruise to drop out while driving is otherwise normal. U0104 is lost contact, U0305 a software conflict.
- What you may notice
- Adaptive cruise control unavailable
- Check engine light that does not go out after clearing
- Likely causes
- LikelyEngine controller software detecting the fault falsely (update available)
- PossibleRadar or cruise module sending implausible requests, for example after misalignment or damage
- RareDisturbed CAN traffic from connectors or wiring
- 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: €50 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.