What Does P024E Mean?
The charge air cooler bypass position sensor 'A' circuit voltage is lower than the ECM's expected minimum threshold. This typically means the sensor signal is stuck near 0V, shorted to ground, or the sensor has an internal failure pulling the output low. The ECM cannot determine the bypass valve position and will revert to default operation.
Common Causes
30%
Short to ground in the sensor A signal wire
30%
Faulty position sensor A with internal short to ground
20%
Corroded or water-damaged connector shorting signal to ground
15%
Damaged 5V reference supply causing low sensor output
5%
ECM input circuit pulled low internally
Diagnostic Steps
1
Monitor the bypass position sensor A PID — if it reads 0% or minimum at all times regardless of valve position, the signal is stuck low.
2
Disconnect the sensor connector and measure the signal wire voltage at the harness side with key on — if voltage rises to approximately 2.5V (pulled up by ECM), the sensor is internally shorted. If voltage stays low, the wiring has a short to ground.
3
Check for water intrusion in the sensor connector — moisture bridges between the signal pin and ground pin will create a low-resistance path pulling the signal low. Dry the connector and apply dielectric grease.
4
Measure the 5V reference at the sensor connector — if the reference is missing or very low, the sensor cannot produce an output signal. Check for shorted sensors on the same reference circuit that could be pulling the 5V bus down.
5
Trace the signal wire from the sensor connector to the ECM. Check for pinched, chafed, or bare wire touching metal — especially near mounting brackets and through-panel grommets.
Estimated Repair Cost
$80 - $350
Parts + labor, varies by vehicle and location
The charge air cooler bypass position sensor 'A' circuit voltage is lower than the ECM's expected minimum threshold. This typically means the sensor signal is stuck near 0V, shorted to ground, or the sensor has an internal failure pulling the output low. The ECM cannot determine the bypass valve pos...
The most common cause of P024E (Charge Air Cooler Bypass Position Sensor "A" Circuit Low) is: Short to ground in the sensor A signal wire
Typical repair costs for P024E 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 without position feedback. This is not an immediate safety hazard. The vehicle can be driven normally, but intercooler bypass control will be less precise. No significant risk at normal driving conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P024E to identify the root cause.
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Quick Info
Category
Powertrain
System
Turbocharger / Supercharger System
Difficulty
Type
Generic (SAE)
Recommended Tools
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