Faulty charge air cooler bypass position sensor or actuator with an integrated sensor; Damaged, chafed or shorted wiring to ground in the sensor signal circuit; Corroded, loose or contaminated connector terminals at the sensor or control unit; Open circuit or high resistance in the sensor supply or signal wire pulling the signal low; Bypass valve seized or mechanically stuck, causing an implausible sensor reading; Fault inside the engine control unit.

P024E

Charge Air Cooler Bypass Position Sensor A Circuit Low.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
2: AreaFuel and air metering (injector circuit)
4E: FaultThe specific fault in that area

What it means

P024E means the engine control unit has detected a low voltage signal from the charge air cooler bypass position sensor 'A' circuit. The control unit sees the sensor signal sitting below the expected range, which points to a short to ground, an open circuit that pulls the signal low, or a faulty sensor. Not every engine has a charge air cooler bypass, so the exact layout and sensor type depend on the model and engine.

Symptoms

Engine warning light on
Reduced power or the engine going into limp mode
Poor or inconsistent boost pressure
Hesitation or sluggish acceleration
Higher than normal intake air temperatures
Possible stored boost or intake air temperature codes alongside P024E

Possible causes

Faulty charge air cooler bypass position sensor or actuator with an integrated sensorlikely
Damaged, chafed or shorted wiring to ground in the sensor signal circuitlikely
Corroded, loose or contaminated connector terminals at the sensor or control unitpossible
Open circuit or high resistance in the sensor supply or signal wire pulling the signal lowpossible
Bypass valve seized or mechanically stuck, causing an implausible sensor readingpossible
Fault inside the engine control unitrare

How to diagnose

Read all stored codes and freeze frame data, noting engine speed, load and temperature when the code set, and check for related boost or intake temperature codes
Check for manufacturer service bulletins or known issues for the specific model and engine
Visually inspect the sensor, bypass valve, wiring and connectors for heat damage, chafing, oil contamination, water ingress or corrosion
Check the live data for the bypass position reading and see whether it responds when the valve is commanded, if the system supports this
Check the sensor supply voltage and reference ground at the connector against the manufacturer's specification
Test the signal wire for a short to ground and for continuity back to the control unit with the battery disconnected, following the wiring diagram
Check that the bypass valve moves freely and is not seized or obstructed, following the model-specific procedure
If wiring and sensor test fine, check for a calibration update for the control unit before suspecting the unit itself

How to fix

Replace the bypass position sensor or the bypass actuator assembly if the sensor is not sold separately
Repair or replace damaged wiring and fix any short to ground
Clean or repair connector terminals, or replace the connector if corroded or damaged
Free or replace a seized bypass valve
Update the control unit calibration only if a known outdated or faulty calibration is confirmed as the cause
Clear the code after the repair and road test to confirm it does not return

Can I keep driving?

Medium severity

The car can usually be driven for a short time, but it may have reduced power and poor boost control. Get it checked soon to avoid the fault worsening or the engine running with poorly controlled intake temperatures.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.