P3009low severityPowertrain
Turbo/Supercharger Intercooler Temperature Sensor Circuit
on 2010 Lexus GS 430 4.3L V8 · RWD
What this code means
The charge air cooler (intercooler) temperature sensor is reporting values outside the expected range. The PCM uses this data to optimize boost and timing.
Symptoms
- Check Engine Light
- Reduced power in hot conditions
- Excessive timing retard
- Poor performance on hot days
- Inconsistent boost levels
Common causes
- Faulty intercooler temperature sensor
- Corroded sensor connector
- Damaged wiring
- Clogged intercooler fins
- Intercooler leak reducing cooling
Diagnostic steps
- Read intercooler temp PID and compare to ambient
- Test sensor resistance vs temperature chart
- Inspect sensor connector for corrosion
- Check intercooler for external blockage
- Pressure test intercooler for leaks
Repair notes
Replace intercooler temperature sensor. Clean intercooler fins if clogged. Repair any intercooler leaks found.
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P0010
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P0013
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P0015
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