U3500Control Module Input Power A Circuit Range/Performance
- Generic OBD-II code · Network
- How the car detects it
- U3500 says that supply input A of a module is present but its voltage is implausible, for example outside the window expected for the current power mode or contradicting other measurements, without clearly passing a lower or upper limit. It thus sits between U3006, which reports a missing or open feed, and the hard limit codes U3501 and U3502. Which pin is A is up to the manufacturer; in GM's electric brake booster tables (2016–2019 hybrid) A is the module's own logic and CAN supply, watched for under 7.5 V and over 16 V, but GM uses only the Low and High codes there. No manufacturer documents U3500 publicly. Typical causes are a high-resistance contact that sags under load, a poor ground or a drifting internal measurement.
- What you may notice
- Functions of the module dropping out or behaving inconsistently
- Code returns mainly under electrical load
- Likely causes
- PossibleHigh-resistance terminal or fuse contact on feed A
- PossiblePoor module ground shifting the measured supply
- RareDrifting voltage measurement inside the module
- Repair
- Medium · Often possible to do yourself.Typical cost: €10 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.