What Does P024F Mean?
The charge air cooler bypass position sensor 'A' circuit voltage is higher than the ECM's expected maximum threshold. This high-circuit condition typically means the sensor signal is stuck near 5V, possibly due to an open ground, short to reference voltage, or internal sensor failure. The ECM cannot determine the actual bypass valve position.
Common Causes
30%
Open ground circuit for position sensor A causing signal to float high
25%
Short to 5V reference in the signal wire
25%
Faulty position sensor A with internal open or short to reference
15%
Disconnected or corroded sensor connector
5%
ECM input circuit fault reading high
Diagnostic Steps
1
Monitor the bypass position sensor A PID — if it reads 100% or maximum constantly regardless of valve position, the signal is stuck high.
2
Disconnect the sensor connector and measure the signal wire voltage at the harness side. If it drops to near 0V, the sensor is pulling it high (internal fault). If it remains high, the wiring has a short to the 5V reference or the ground is open.
3
Check the ground pin at the sensor connector for continuity to chassis ground — resistance should be less than 1 ohm. An open ground allows the signal to float to the reference voltage level.
4
Inspect the wiring harness for locations where the signal wire and 5V reference wire run close together. Check for insulation damage that could allow the wires to contact each other.
5
If all wiring checks pass, replace the position sensor A. After installation, verify the output voltage changes proportionally as the bypass valve moves — it should sweep between approximately 0.5V and 4.5V.
Estimated Repair Cost
$80 - $350
Parts + labor, varies by vehicle and location
The charge air cooler bypass position sensor 'A' circuit voltage is higher than the ECM's expected maximum threshold. This high-circuit condition typically means the sensor signal is stuck near 5V, possibly due to an open ground, short to reference voltage, or internal sensor failure. The ECM cannot...
The most common cause of P024F (Charge Air Cooler Bypass Position Sensor "A" Circuit High) is: Open ground circuit for position sensor A causing signal to float high
Typical repair costs for P024F range from $80 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The bypass valve will operate in open-loop without position feedback, which is a performance concern rather than a safety issue. The vehicle can be driven normally. Intercooler bypass precision will be reduced but there is no immediate risk to the driver or vehicle.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P024F to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Turbocharger / Supercharger System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
