P024C Charge Air Cooler Bypass Position Sensor Circuit

P024C Charge Air Cooler Bypass Position Sensor Circuit

OBD-II DTC Datasheet

Charge Air Cooler Bypass Position Sensor Circuit

What does this mean?

This Generic Transmission Diagnostic Trouble Code (DTC) typically applies to all OBD-II vehicles equipped with a charge air cooler. This may include, but is not limited to, Ford, Chevy, Mazda, Toyota, etc.

In forced-air systems, they use a charge air cooler or, as I call it, an intercooler (IC) to help cool the charge air used by the engine. They work in a similar way to a radiator.

In the case of the IC, instead of cooling the antifreeze, it cools the air in turn for a more efficient air / fuel mixture, better fuel consumption, better performance, etc. The IC is part of the boost pressure side of the intake system. The bypass valve is used exactly as the name suggests to allow air bypassing the intercooler to be vented to atmosphere and / or recirculated.

The electronic control module (ECM) uses it to adjust the valve according to the current conditions and needs of the engine. The ECM also monitors the physical valve position using the charge air cooler bypass position sensor.

The ECM turns on the check engine light using P024C and related codes when it monitors an out-of-range condition on the bypass control circuit IC and / or affected sensors. This code can be caused by a mechanical and / or electrical problem. If I had to guess here I would lean towards mechanical issues, more likely to be a problem. In this case, both options are possible.

P024C Charge Air Cooler Bypass Position Sensor Circuit code set when there is a general malfunction of the position sensor or circuit.

What is the severity of this DTC?

The severity in this case will be medium. This problem should not be ignored, as it can quickly develop into something much more serious. Keep in mind that problems do not improve over time if they are not corrected. Engine damage is costly, almost every time, so if you've exhausted your options, take your vehicle to a reputable repair shop.

What are some of the symptoms of the code?

Symptoms of a P024C engine code may include:

• Poor engine performance
• The car goes into "weak-willed mode"
• Engine misfire
• Poor fuel consumption

What are some of the common causes for the code?

Reasons for this code may include:

• Stuck open / closed bypass valve
• Obstacle in the working range of the bypass valve
• Charge air cooler bypass position sensor defective
• Broken or damaged wire harness
• Fuse / relay defective.
• ECM problem
• Pin / connector problem. (e.g. corrosion, broken tongue, etc.)

What are some steps to troubleshoot the P024C?

Be sure to check the Technical Service Bulletins (TSB) for your vehicle. Gaining access to a known fix can save you time and money during diagnostics.

Basic step # 1

Locate the charge air cooler bypass valve by following the charge pipe to the intercooler (IC), it can be installed directly on the charge pipe. Pretty much depending on your particular make and model, you might find your IC mounted in the front bumper, front fenders, or perhaps right under the hood, among many other possible places. Once located, check for obvious physical damage.

NOTE: Make sure the engine is off.

Basic step # 2

It can be quite simple to remove the valve completely from the vehicle to test if it works. Highly recommended if P024B is active. After removal, check for obstructions in the valve's range of motion. If possible, clean the valve before reinstalling.

NOTE: Always refer to your service manual first, as this may not be possible or recommended for your vehicle in this regard.

Basic tip # 3

Bypass valve harness can be routed through exposed areas. These areas should be carefully inspected for nicks, cuts, corrosion, etc. On the wires in the circuit.

NOTE. Be sure to disconnect the battery before performing any electrical repairs.

Basic step # 4

Depending on your scan tool, you can test the valve's performance by operating it and observing its range of motion. If possible, you can detach one end of the valve to see the moving parts. Use a scan tool to fully open and close the valve while observing the mechanical operation of the valve itself. If you notice that the valve is stuck and nothing prevents it, most likely the valve is defective. In this case, you can try replacing it. Make sure the manufacturer also recommends a new valve in this case. See Manual.

The charge air cooler bypass sensor is typically located / mounted on the valve itself in line with the valve “door” to effectively monitor position. It is very important to make sure that the "door" is free of obstacles throughout its entire range of motion.

Basic step # 5

You will want to eliminate any electrical problem with the harness being used. To do this, you may have to disconnect it from the valve and ECU. Using a multimeter, check the continuity of the circuit by performing numerous basic electrical tests (eg continuity). If everything passes, you can perform several input tests, including a valve connector test to verify that the ECM is working with the valve.

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