P024C

Charge Air Cooler Bypass Position Sensor A Circuit

P024C is a generic OBD-II powertrain diagnostic trouble code: Charge Air Cooler Bypass Position Sensor A Circuit. 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
P024C
Group
Powertrain
System
Powertrain
Severity
Warning (MIL on)
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What P024C means

Code P024C is a generic OBD-II powertrain fault that triggers when the ECM detects a general malfunction in the Charge Air Cooler (CAC) bypass position sensor circuit. The charge air cooler — commonly called an intercooler — is used in turbocharged and supercharged engines to reduce the temperature of compressed intake air before it enters the combustion chamber, improving density, power output, and fuel efficiency. A bypass valve diverts air around the intercooler under certain operating conditions, and a dedicated position sensor monitors whether the valve is correctly responding to ECM commands. When the sensor signal falls outside expected operating parameters or is absent entirely, P024C is stored and the MIL is illuminated. Because this is a general circuit fault (as opposed to the range, low, or high sub-codes), it can indicate anything from a broken wire to a failed sensor or a seized valve. Forced-induction vehicles from Ford, Chevrolet, Mazda, Toyota, and others are all susceptible. Left unaddressed, the bypass valve may become uncontrolled, leading to reduced boost efficiency, increased intake temperatures, and potential power loss or engine damage over time.

Common causes

Most-frequently reported root causes when P024C is logged.

  • 1
    Defective charge air cooler bypass position sensor
  • 2
    Open or short circuit in the sensor wiring harness
  • 3
    Corroded, damaged, or loosely connected sensor connector pins
  • 4
    Bypass valve seized in open or closed position
  • 5
    Physical obstruction preventing bypass valve movement
  • 6
    Blown fuse or faulty relay in the sensor supply circuit
  • 7
    ECM internal fault or software error

Symptoms drivers notice

MIL (Check Engine Light) illuminated
Reduced engine power, especially under acceleration
Vehicle entering limp/reduced-power mode
Engine hesitation or stumble on throttle application
Decreased fuel economy
Possible engine misfires under load

How to diagnose P024C

A typical diagnostic flow when this code is present.

  1. 1
    Connect a scan tool and record all stored DTCs; note any related intercooler or throttle codes
  2. 2
    Visually inspect the bypass valve and its actuator for mechanical damage or obstructions
  3. 3
    Inspect the sensor wiring harness along its full routing for cuts, chafing, or heat damage
  4. 4
    Check the connector at the sensor for corrosion, bent pins, or broken locking tabs
  5. 5
    Use a scan tool to command the bypass valve open and closed while observing actual position feedback
  6. 6
    Perform continuity and voltage tests on the sensor signal, ground, and reference circuits with a multimeter
  7. 7
    If wiring and connector pass inspection, replace the bypass position sensor and re-test

Related powertrain codes

Frequently asked questions

Can I drive with a P024C code active?

Short trips are generally possible, but continued driving is not recommended. The uncontrolled bypass valve may cause elevated intake temperatures, reduced performance, and eventually accelerate wear on turbocharger components.

Is P024C specific to any manufacturer?

No — it is a generic SAE code that applies to any OBD-II vehicle with a charge air cooler bypass system, including models from Ford, GM, Mazda, and Toyota.

What is the difference between P024C and P024D/P024E/P024F?

P024C is a general circuit fault with no voltage direction implied. P024D indicates out-of-range performance, P024E a low voltage/signal condition, and P024F a high voltage/signal condition — each pointing to progressively more specific electrical failure modes.

Could a dirty intercooler cause P024C?

Indirectly, yes. Heavy oil fouling or a clogged intercooler core can restrict air flow enough to cause the bypass valve to behave erratically, potentially triggering circuit-related faults alongside performance codes.

Disabling P024C in software

RaceTune can permanently disable P024C — 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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