U3030Ignition Output Start
- Generic OBD-II code · Network
- How the car detects it
- U3030 points to the start output, the line through which a module energizes the starter relay or passes on a crank request; it should be active for seconds at most. In Tokai Rika's push-button start patents the power supply unit switches the starter relay on together with the ignition relays once brake pedal and button are confirmed, and off as soon as the engine controller reports that the engine has fired. Which unit owns this output varies: on GM's 2012 pickups the engine control module, not the body controller, drives the starter enable relay. A module logs U3030 when the line stays dead although cranking is commanded, leaving the engine unable to crank, or stays live after the command ends, which can keep the starter engaged. No manufacturer documents U3030 publicly; starter relay circuit faults have their own codes, P0615 to P0617.
- What you may notice
- Engine does not crank when start is requested
- Starter keeps running or grinding after the engine has fired
- Start only on a second or third attempt
- Likely causes
- PossibleFaulty start driver in the module, not switching or stuck on
- PossibleStart control wire open or shorted to ground or voltage
- PossibleOpen or shorted coil in the starter relay loading the output
- RareWeak battery pulling the output level down during cranking
- Repair
- Medium · Usually a job for a workshop.Typical cost: €20 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.