P2B92Turbocharger/Supercharger B Temperature Sensor Circuit Range/Performance
- 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
- P2B92 says that temperature sensor B delivers a plausible voltage whose content is wrong: it may hang at one value, follow load changes too slowly or disagree with its partner sensor A on an engine with two chargers. A sensor that sits in a soot-coated or oil-wetted spot reacts sluggishly and is a classic trigger. CARB 13 CCR 1968.2 (e)(15.2.1) requires such rationality tests to look for readings that are wrongly high as well as wrongly low. GM's patent US11060525B2 illustrates why the value matters: boost is reduced when the charger runs too hot, and a sensor fault switches that protection off. No manufacturer documents P2B92 publicly. Clear electrical faults use P2B8F to P2B91; sensor A has P2B71.
- What you may notice
- Warning lamp, usually without drivability change
- Sensor B lags behind or contradicts sensor A in live data
- Boost may be limited as a precaution
- Likely causes
- LikelySensor tip coated with soot or oil, responds sluggishly
- PossibleSensor element aged and reading off
- RareContact resistance in connector or wiring
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.