What is OBD-II Code P2AC7 – Charge Air Cooler Coolant Temperature Sensor B Circuit

OBD-II Code P2AC7 – Charge Air Cooler Coolant Temperature Sensor B Circuit: An Explanation for the Average Person

As a mechanic, I know that OBD codes can be confusing for the average person. That’s why I’m here to explain what OBD-II Code P2AC7 – Charge Air Cooler Coolant Temperature Sensor B Circuit means and how you can repair the issue.

What is OBD-II Code P2AC7?

OBD-II Code P2AC7 is a diagnostic trouble code that indicates there is a fault in the charge air cooler system’s coolant temperature sensor circuit B. The code is designed to help you detect issues with your vehicle’s components and systems. P2AC7 is specific to certain vehicle models, so it’s always important to check your vehicle’s manual to see if this code is applicable to your car.

What Does the Charge Air Cooler Do?

The charge air cooler is responsible for cooling the compressed air from the turbocharger before it enters the engine. The cooler regulates the air temperature and ensures it’s at optimal levels, allowing the engine to perform better. If the system isn’t functioning correctly, it can result in decreased engine performance and fuel efficiency.

What Does the Coolant Temperature Sensor Do?

The coolant temperature sensor is responsible for monitoring the temperature of the coolant in the engine. The sensor is needed to ensure that the engine is operating within safe limits. If the coolant temperature sensor is malfunctioning, it can result in issues with the engine, such as overheating or lower engine performance.

How to Repair OBD-II Code P2AC7

To repair OBD-II Code P2AC7, you’ll first need to locate the charge air cooler and the coolant temperature sensor. The sensor is typically located near the engine on the coolant line. The first step is to check the wiring and connections between the temperature sensor and the control module. Look for any frayed wires, loose connections, or damage to the connector.

If the wiring and connections are in good condition, the next step is to check the sensor itself. Remove the sensor and test it for any readings that are outside the normal range. If the sensor is faulty, you’ll need to replace it with a new one. Once the sensor has been replaced, clear the code and test drive the vehicle to ensure that the issue has been resolved.

Frequently Asked Questions

Q: What causes OBD-II Code P2AC7?
A: There are several potential causes of OBD-II Code P2AC7, including a faulty charge air cooler, issues with the coolant temperature sensor, or damaged wiring.

Q: Can I continue to drive my vehicle with OBD-II Code P2AC7?
A: It’s not recommended to continue driving your vehicle with OBD-II Code P2AC7, as it can result in decreased engine performance and fuel efficiency.

Q: How much will it cost to repair OBD-II Code P2AC7?
A: The cost of repairs for OBD-II Code P2AC7 will depend on the level of damage and what components need to be replaced. It’s always best to get a quote from a trusted mechanic.

Q: Can I reset OBD-II Code P2AC7 on my own?
A: Yes, you can reset OBD-II Code P2AC7 on your own using an OBD-II scan tool or by disconnecting the vehicle’s battery for several minutes.

Q: How can I prevent OBD-II Code P2AC7 from occurring?
A: Proper maintenance of your vehicle’s charge air cooler and coolant temperature sensor can help prevent issues that lead to OBD-II Code P2AC7.


OBD-II Code P2AC7 can be a frustrating issue for car owners, but with the right knowledge and tools, it can be resolved. By understanding what the code means and how to repair it, you can feel confident in keeping your vehicle running smoothly. Always remember to consult with a trusted mechanic if you’re unsure about any aspect of your vehicle’s repair needs.

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