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

1. Read intercooler temp PID and compare to ambient
2. Test sensor resistance vs temperature chart
3. Inspect sensor connector for corrosion
4. Check intercooler for external blockage
5. 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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