P2B92 code meaning
Turbocharger/Supercharger B Temperature Sensor Circuit Range/Performance
Powertrain system Generic code P2Bxx codes Check engine light
What P2B92 means
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.
P2B92 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 2.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P2B92
- Warning lamp, usually without drivability change
- Sensor B lags behind or contradicts sensor A in live data
- Boost may be limited as a precaution
Common causes of P2B92
- Most likelySensor tip coated with soot or oil, responds sluggishly
- PossibleSensor element aged and reading off
- Less likelyContact resistance in connector or wiring
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Turbocharger b temperature sensorWiring harnessECM
What each part of P2B92 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| B | Area: hybrid propulsion. |
| 92 | The exact fault in that area. |
What to do next
- Note P2B92 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2B92
What does P2B92 mean?
P2B92 means "Turbocharger/Supercharger B Temperature Sensor Circuit Range/Performance". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2B92?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2B92 fail an emissions test?
Yes, it can. P2B92 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2B92 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will P2B92 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.