P0510Closed Throttle Position Switch
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- Older engines with a mechanical throttle have a separate idle contact on the throttle or the combined throttle position sensor (Bosch Motronic throttle switch, Nissan and Toyota sensors with idle switch). The module uses it to recognise idle – for idle control, fuel cut-off on overrun and idle ignition timing – and as a substitute if the position sensor fails. P0510 flags an implausible switch: closed with the throttle open, or open at idle. Manufacturer thresholds were not found in accessible documents; with electronic throttle the switch no longer exists.
- What you may notice
- Idle too high or fluctuating
- Engine stalls when coasting
- No fuel cut-off on overrun (higher consumption)
- Likely causes
- LikelyIdle switch or throttle sensor misadjusted
- LikelySwitch contacts worn, dirty or corroded
- PossibleWire or connector open or shorted
- PossibleThrottle not closing (deposits, sticking cable, stop misadjusted)
- RareValue not relearned after replacement
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.