P024F

Charge Air Cooler Bypass Position Sensor A Circuit High

P024F is a generic OBD-II powertrain diagnostic trouble code: Charge Air Cooler Bypass Position Sensor A Circuit High. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.

Code
P024F
Group
Powertrain
System
Powertrain
Severity
Warning (MIL on, possible limp mode)
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What P024F means

P024F is set when the ECM detects a higher-than-expected voltage on the Charge Air Cooler bypass position sensor signal circuit. In a standard 5 V-referenced potentiometer, the signal should remain between approximately 0.5 V and 4.5 V across the full valve travel range. When the voltage exceeds the upper calibrated limit — typically above 4.7–4.9 V — P024F is stored and the MIL illuminates. This high-voltage condition is most often caused by an open circuit in the signal or ground wire, which causes the signal line to float up toward the reference voltage, or by a short of the signal wire to the 5 V supply. A failed sensor with an internally open wiper track will produce the same result. Because the ECM can no longer determine actual bypass valve position, it may default the valve to a fixed safe position and restrict engine output to prevent damage from elevated charge air temperatures or uncontrolled boost. Turbocharged and supercharged vehicles across all manufacturers using a dedicated intercooler bypass valve are susceptible to this generic SAE code. Diagnosis centers on isolating whether the fault is in the wiring, the sensor itself, or, rarely, the ECM signal input circuit.

Common causes

Most-frequently reported root causes when P024F is logged.

  • 1
    Open circuit (broken wire) in the sensor signal or ground return path
  • 2
    Short of the sensor signal wire to the 5 V reference supply
  • 3
    Internally failed sensor with an open wiper track
  • 4
    Disconnected or poorly seated connector allowing signal line to float high
  • 5
    Corroded connector terminal on the ground side increasing return resistance
  • 6
    Damaged wiring harness with a severed ground wire
  • 7
    ECM input circuit fault or damaged pull-up resistor

Symptoms drivers notice

MIL (Check Engine Light) illuminated
Reduced engine power or limp mode activation
Scan tool displays bypass sensor voltage at or near 5 V regardless of valve position
Poor boost response and sluggish acceleration under load
Possible elevated charge air temperature readings on scan data
Companion codes for related boost or throttle body systems may also be present

How to diagnose P024F

A typical diagnostic flow when this code is present.

  1. 1
    Retrieve freeze-frame data and check if the high voltage condition is steady or intermittent
  2. 2
    With the sensor connected, verify live sensor voltage on a scan tool — a reading pegged near 5 V confirms the fault
  3. 3
    Disconnect the sensor and check if the signal voltage drops; if it remains high, the harness has a short to supply
  4. 4
    Check continuity of the sensor ground wire from the sensor connector back to chassis ground
  5. 5
    Inspect the full wiring harness for chafing against hot or sharp surfaces that could sever the ground or short the signal wire
  6. 6
    Replace the sensor and retest; if the code returns, perform a complete circuit trace with a wiring diagram
  7. 7
    If the circuit tests normal, check for ECM technical service bulletins related to sensor input voltage tolerance

Related powertrain codes

Frequently asked questions

Why does an open circuit cause a high voltage reading?

The ECM applies a small internal pull-up voltage to the sensor signal pin to prevent the input from floating. When the signal wire is broken or the sensor is disconnected, this pull-up pulls the pin toward the reference voltage, causing a falsely high reading.

Is P024F more serious than P024E?

Both codes indicate the sensor signal is unusable, so the practical impact on drivability is similar. P024F (high) is slightly more commonly caused by a simple open circuit or disconnected connector, which can be easier to locate than the ground short typically responsible for P024E (low).

Can wiggling the wiring harness confirm an intermittent P024F?

Yes. If the code is intermittent, gently flexing the harness near the sensor connector while monitoring live sensor voltage can reveal a broken wire that makes and breaks contact, confirming the fault location.

Will a new sensor fix P024F if the harness is damaged?

No. Replacing the sensor without repairing an open or shorted wiring harness will not resolve the code. Always diagnose the circuit first before condemning the sensor.

Disabling P024F in software

RaceTune can permanently disable P024F — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.

Permanent
The monitor is disabled in the ECU itself — not just cleared. It cannot return.
Tailored to your file
Each patch is matched to your specific software version — never a one-size-fits-all file.
Reversible
The original file is always preserved. Reflash the stock to return the ECU to factory state.

Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.

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