The OBD-II Code P0071 is a trouble code that is stored in the Powertrain Control Module (PCM) when there is an issue with the circuit that controls the ambient air temperature sensor. This sensor is used by the PCM to determine the ambient air temperature around the vehicle, and it plays an important role in the operation of many systems, including the climate control system, the fuel injection system, and the transmission system. In this article, we will take a closer look at the OBD-II Code P0071 and explore what it means, how it can be diagnosed, and what steps can be taken to repair the issue.
What is the Ambient Air Temperature Sensor?
The ambient air temperature sensor is a small electronic device that is located in the front of the vehicle, usually near the grille. It is designed to measure the temperature of the air that surrounds the vehicle, and it sends this information to the PCM. The PCM uses this information to make adjustments to many different systems, including the engine, transmission, and climate control systems.
What Causes the P0071 Code?
The P0071 code is usually caused by a fault in the circuit that controls the ambient air temperature sensor. This can be caused by a number of different issues, including damaged wiring, a faulty sensor, a problem with the PCM, or a short-circuit in the circuit that controls the sensor. In addition to the P0071 code, drivers may also experience issues with their vehicle’s climate control system, such as an inability to control temperature or air volume, or difficulty defrosting windows.
How is the P0071 Code Diagnosed?
To diagnose the P0071 code, mechanics will first perform a visual inspection of the ambient air temperature sensor and the surrounding wiring. They will look for any obvious signs of damage, such as frayed wires or a damaged sensor. If no obvious issues are found, a diagnostic scan tool will be used to communicate with the PCM and retrieve any stored trouble codes. The mechanic will then perform a series of tests on the circuit that controls the ambient air temperature sensor, including checking for continuity, resistance, and voltage.
What are the Possible Repairs for the P0071 Code?
If the issue causing the P0071 code is a faulty ambient air temperature sensor, the sensor will need to be replaced. If the issue is with the wiring or the circuit that controls the sensor, the wiring will need to be repaired or replaced, and the circuit will need to be tested and repaired. If the PCM is found to be the cause of the issue, it will need to be replaced or reprogrammed.
In some cases, multiple repairs may be required to fully resolve the issue. For example, if the ambient air temperature sensor is found to be faulty, but the wiring is also damaged, both the sensor and the wiring will need to be replaced.
Frequently Asked Questions:
1. Is the P0071 code dangerous?
No, the P0071 code is not a dangerous code. However, it can cause issues with your climate control system, which may make driving less comfortable.
2. Can I drive with the P0071 code?
It is technically possible to drive with the P0071 code, but doing so may cause issues with your climate control system and reduce the overall comfort of your ride. It is recommended that you have the code diagnosed and repaired as soon as possible.
3. What is the cost to repair the P0071 code?
The cost to repair the P0071 code can vary depending on the cause of the issue. Replacing a faulty ambient air temperature sensor is usually relatively inexpensive, while repairing damaged wiring or replacing a faulty PCM can be more costly.
4. Can I repair the P0071 code myself?
It is possible to repair the P0071 code yourself if you have experience with automotive wiring and electronics. However, if you are not comfortable working with automotive electrical systems, it is recommended that you seek the help of a professional mechanic.
5. How can I prevent the P0071 code from occurring in the future?
There are a few steps you can take to prevent the P0071 code from occurring in the future, including inspecting the wiring and the sensor regularly for signs of damage, avoiding harsh driving conditions that could damage the wiring or the sensor, and having your vehicle regularly serviced by a qualified mechanic.
In conclusion, the OBD-II Code P0071 is a relatively common trouble code that is caused by an issue with the circuit that controls the ambient air temperature sensor. While the code is not dangerous, it can cause issues with your climate control system and reduce the overall comfort of your ride. If you experience the P0071 code, it is recommended that you have the code diagnosed and repaired as soon as possible by a qualified mechanic. By taking steps to prevent the code from occurring in the future, you can ensure that your vehicle remains comfortable and reliable for years to come.