P2578 moderate

Turbocharger Intake Air Temperature Sensor Circuit

The P2578 code means the vehicle's onboard diagnostic system has detected: Turbocharger Intake Air Temperature Sensor Circuit. This is a moderate severity code.

My Garage →
Keep driving?
Short distances only
DIY difficulty
moderate
Estimated cost
$150 - $400 (parts and labor)
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Common Symptoms

  • Check Engine Light on
  • Engine may run rich under boost
  • Reduced turbo performance
  • Higher exhaust gas temperatures
  • Poor fuel economy during spirited driving

Probable Causes (Ranked by Likelihood)

  • Faulty turbo intake air temperature sensor Very High
  • Damaged sensor connector or wiring High
  • Intercooler efficiency problem affecting readings Moderate
  • PCM calibration error Low

Step-by-Step Diagnostic Procedure

  1. Read freeze frame data and confirm P2578 is present

  2. Test intake air temperature sensor resistance at known temperatures

  3. Inspect sensor connector and wiring for damage

  4. Compare pre and post intercooler temperature readings

Frequently Asked Questions

What does P2578 mean?

P2578 indicates a malfunction in the turbocharger intake air temperature sensor circuit, which monitors the temperature of air entering the engine after the turbo.

Can I drive with a P2578 code?

You can drive short distances. The engine may run slightly rich and have reduced performance. Extended driving could increase exhaust temperatures.

How much does it cost to fix P2578?

Repairs typically cost $150 to $400, with a sensor replacement being the most common fix at $150 to $300.

Sources

This page is built from documented references. Verify against your own service info before repair work.

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