U3016Control Module Ground D
- Generic OBD-II code · Network
- Can trigger limp mode
- How the car detects it
- U3016 closes the ground series and stands for a fourth return path, D, that the module considers open or out of line with its other grounds. Four grounds on one unit are rare, so before chasing the D pin it pays to check whether grounds A to C are logged as well; several ground codes at once point to a shared splice, the battery negative cable or a body-to-engine strap rather than to one wire. No manufacturer publishes a definition for U3016. GM's ratio check for two brake module grounds (19OBDG03B) and Ford's bulletin 26-2150, which assigns grounds A and B of a steering module to different bolts, show that each letter means a real, separate fastening point. CARB expects electrical faults of such components to be caught by continuous circuit checks.
- What you may notice
- Warning or service message for the affected system
- Several ground or supply codes logged at the same time
- Intermittent loss of the module's function
- Likely causes
- LikelyPoor shared ground, battery negative or engine-to-body strap
- PossibleCorroded or loose eyelet at ground point D
- PossibleDamaged ground pin or water in the module connector
- RareFault in the module's own ground monitoring
- Repair
- Medium · Often possible to do yourself.Typical cost: €10 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.