What it means
The ECM detects a circuit fault on the turbocharger/supercharger a temperature sensor. Reading cannot be used reliably for control.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Turbocharger or supercharger A has a temperature sensor that lets the engine control module monitor the temperature at that forced-induction system. P2B6E sets when the sensor circuit has a fault that makes its reading unreliable, so the module may limit power or use protective control strategies.
Common causes
Most likely first.
- Sensor failed
- Wiring or connector fault
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
How to diagnose it
- Record freeze-frame data and compare the live temperature sensor A reading with ambient temperature when the engine and forced-induction system are cold.
- Inspect sensor A’s connector and harness near the turbocharger or supercharger for looseness, heat damage, abrasion, or contamination.
- Check the sensor circuit’s reference, ground, and signal wiring according to the wiring diagram and manufacturer’s specification.
- Test sensor A and its connector for an open, short, or implausible signal before replacing the sensor.
- If the sensor circuit reads plausibly, inspect the intake and charge-air plumbing for loose joints that could explain the hissing or whistling.
Common fixes
- Reconnect or clean the temperature sensor A connector.
- Repair heat-damaged or chafed wiring in sensor A’s circuit.
- Replace turbocharger or supercharger A’s temperature sensor if its output is faulty.
- Repair a loose intake or charge-air connection if inspection confirms a leak.
Can I keep driving?
Avoid hard acceleration and boost, especially if power is reduced or smoke appears; arrange diagnosis soon. An unreliable temperature input can affect engine protection and operation, while an intake leak or smoke may signal a separate problem that can worsen.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.