Fuel and air

P024E — Charge Air Cooler Bypass Position Sensor A Circuit Low

Severity: medium Drive with care, to a shop

What P024E means

The engine control unit monitors the position of the charge air cooler (intercooler) bypass valve through position sensor A. P024E is set when the sensor signal voltage stays below the expected range. This points to a bad sensor, an open or shorted-to-ground circuit, or a problem with the valve or its actuator. Without a reliable reading, the ECU cannot manage intake air temperature and boost accurately.

Symptoms

  • Check Engine light on
  • Reduced power and sluggish acceleration
  • Low turbo boost
  • Worse fuel economy
  • Occasional rough idle
  • Limp mode in some cases

Possible causes

  1. Failed charge air cooler bypass position sensor
  2. Damaged, corroded or chafed wiring and connectors
  3. Signal wire shorted to ground, or lost sensor supply voltage
  4. Stuck or broken bypass valve or actuator
  5. Debris or carbon buildup blocking valve movement
  6. ECU fault (rare)

How to diagnose

  1. Read all codes and freeze frame data and look for other boost-related codes
  2. Inspect the sensor connector and harness for corrosion, moisture, chafing or loose pins
  3. Check the bypass valve and actuator for free movement and binding
  4. Compare commanded and actual valve position in scan tool live data
  5. Measure reference voltage, supply and ground at the sensor connector
  6. Test the signal wire for opens and shorts to ground using the wiring diagram
  7. Test the sensor against specifications and replace it if out of range
  8. Clear the code and road test to confirm it does not return

Common fixes

  • Replace the bypass position sensor
  • Repair or replace damaged wiring and connectors
  • Clean, repair or replace the bypass valve and actuator
  • Update software or replace the ECU if confirmed faulty

Questions and answers

What does P024E mean?

It means the signal from charge air cooler bypass position sensor A is too low. The ECU is not getting a valid position reading for the bypass valve.

Can I drive with P024E?

Briefly, yes, but power is usually limited. Get it diagnosed soon to avoid problems from incorrect intake air temperature.

How do I fix P024E?

Start by checking the sensor wiring and connector, then the valve for free movement. If those are fine, the sensor or bypass valve assembly is usually replaced.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.