U3010Ignition Input Start
- Generic OBD-II code · Network
- How the car detects it
- U3010 concerns the start or crank request input, which should be active only while the key or button is held in Start. A module sets it when it sees a start signal outside a valid crank event, or misses one although the network reports crank. In GM's 2012 truck wiring manual the start position is the only one in which the run/crank line is active while the accessory line is off, so the start state is recognised from a combination of lines that must change together. No manufacturer documents U3010 publicly. The moment of transition is delicate: Ram found that the 2025 heavy-duty LED headlamp modules flag the run-to-start change as invalid (U300A-29) and treat it as harmless if stored only, which shows that a code logged exactly at cranking can be a software artefact rather than a wiring fault.
- What you may notice
- Engine does not crank or cranks with a delay
- Code stored at each start with no further complaint
- Likely causes
- PossibleWorn start contact or push-button in the ignition switch
- PossibleStart request wire open or shorted to voltage
- PossibleModule software misreading the run-to-start transition
- RareSupply dip during cranking upsetting the input reading
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.