Faulty charge air cooler bypass position sensor; Damaged or corroded wiring harness at the bypass valve connector; Sticking or mechanically binding bypass valve actuator; Failed bypass valve actuator motor or vacuum diaphragm; Loose or damaged electrical connector pins at the sensor; Intake air leaks or boost leaks near the charge air cooler; Engine control module software issue or internal fault (rare)

DTC codes / P02xx · Fuel and air metering (injector circuits) / P024C

P024CCharge Air Cooler Bypass Position Sensor A Circuit

Q: What does code P024C mean?

Charge Air Cooler Bypass Position Sensor A Circuit. P024C means the engine computer has detected an implausible signal from the charge air cooler bypass position sensor on circuit A, which monitors the valve that routes intake air around the cooler. The computer compares the sensor voltage against expected values for the commanded bypass position and sets the code when the reading falls outside the valid range.

P024C means the engine computer has detected an implausible signal from the charge air cooler bypass position sensor on circuit A, which monitors the valve that routes intake air around the cooler. The computer compares the sensor voltage against expected values for the commanded bypass position and sets the code when the reading falls outside the valid range.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

Symptoms you may notice

Illuminated check engine light, often with no other noticeable symptoms
Reduced engine power or limp mode under heavy acceleration
Poor throttle response or hesitation when the turbocharger spools up
Decreased fuel economy due to incorrect air routing
Rough idle or stumbling after a cold start in some vehicles
A slight whistle or whoosh from the charge air cooler area if the bypass valve sticks

Common causes, most likely first

Faulty charge air cooler bypass position sensor
Damaged or corroded wiring harness at the bypass valve connector
Sticking or mechanically binding bypass valve actuator
Failed bypass valve actuator motor or vacuum diaphragm
Loose or damaged electrical connector pins at the sensor
Intake air leaks or boost leaks near the charge air cooler
Engine control module software issue or internal fault (rare)

How to diagnose and fix it

Scan all modules for stored and pending codes, then record freeze-frame data for P024C
Visually inspect the bypass valve, sensor, connector, and wiring for damage or corrosion
Check sensor reference voltage and ground at the connector with a multimeter
Command the bypass valve through a scan tool and observe sensor voltage for smooth travel
Perform a wiggle test on the harness while monitoring sensor signal to reveal intermittent faults
Replace the bypass position sensor or valve assembly if electrical and mechanical checks pass but the signal remains implausible
Clear codes and road-test the vehicle through several drive cycles to confirm the repair

Bypass sensor faults that mimic boost leaks

A sticking bypass valve often sets P024C without any boost leak, so technicians who only smoke-test the intake miss the real cause.
The sensor is frequently integrated into the bypass valve actuator, meaning a bad sensor can require replacing the whole valve assembly on some designs.
Corrosion inside the connector is a common hidden cause, especially on vehicles driven in wet or salty conditions, and can look like a failed sensor.
P024C can be set by a low battery or charging system fault that drops reference voltage during cranking, so check battery health before condemning parts.
After repairs, some vehicles require a bypass valve relearn or adaptation reset through the scan tool to prevent the code from returning.

Can I keep driving with P024C?

You can usually drive the vehicle with P024C, but avoid heavy acceleration and towing until it is repaired because the bypass valve may not route air correctly and could reduce power or damage the turbocharger over time.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.