OBD-II code · Powertrain (generic, extended)
P2B91 Turbocharger/Supercharger B Temperature Sensor Circuit High
The ECM detects a circuit high fault on the turbocharger/supercharger b temperature sensor. Reading cannot be used reliably for control.
Is it safe to drive with P2B91?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal wire shorted to B+
- PossibleOpen sensor
- Less likelyConnector pins corroded - high contact resistance
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Likely to fail
- Parts involved
- Turbocharger B Temperature Sensor, Wiring Harness, Ecm
Related codes
- P2B70Turbocharger/Supercharger A Temperature Sensor Circuit High
- P2B8EIntake Air O2 Sensor Heater Control Circuit High Bank 1
- P2B8FTurbocharger/Supercharger B Temperature Sensor Circuit
- P2B90Turbocharger/Supercharger B Temperature Sensor Circuit Low
- P2B92Turbocharger/Supercharger B Temperature Sensor Range/Performance
- P2B93Wastegate Position Sensor A Exceeded Learning Limit
- P2B94Wastegate Position Sensor B Exceeded Learning Limit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.