U3013Control Module Input Power C Circuit/Open
- Generic OBD-II code · Network
- How the car detects it
- U3013 extends the input power family to a third feed, C, and reports it as missing or open. It only exists on modules with at least three separately fused supplies, such as large body or brake units. No manufacturer documents U3013 publicly, and nothing defines which pin is C; that is up to each maker's wiring. The detection principle can be taken from GM's brake module, which compares two battery feeds and flags one as open when it drops to about half of the other for 75 ms (U3006/U3007). CARB requires electronic inputs that the OBD system relies on to be checked for circuit faults, which is the basis for such checks. In practice a single blown fuse, a pushed-out pin or a weak battery is behind it; if C and D appear together, look for a shared fuse or a supply common to both.
- What you may notice
- Part of the functions of the affected module dead
- Lost communication codes in other modules if the unit shuts down
- Likely causes
- LikelyBlown fuse in the feed C path
- PossiblePushed-out pin, corroded terminal or broken wire on supply C
- PossibleWeak battery or voltage dip during cranking
- Repair
- Medium · Often possible to do yourself.Typical cost: €10 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.