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P0073 is a diagnostic trouble code (DTC) for "Ambient Air Temperature Sensor Circuit High input". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light is on diagnostic inspection. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Ambient Air Temperature Sensor Circuit High input
Depending on the type of vehicle these are some related OBD-II Diagnostic Trouble Codes:
The Power Control Module (PCM) uses information that it receives from the ambient air temperature sensor to regulate the levels of the ambient air temperature and intake air temperature.
If the ambient air temperature reaches a level above that of the intake air temperature, the Power Control Module (PCM) will store the P0073 trouble code and the Check Engine Light will come on.
There are several things that could cause the P0073 trouble code to be stored by the Power Control Module (PCM):
The biggest indication of a problem with the ambient air temperature system is that the Check Engine Light is on. In certain cases, the climate control system (heat and/or air condition controls) will not work as they should.
Freeze frame data and trouble codes are recorded using an OBD-II scanner.
Next, the ambient air temperature sensor’s electrical circuitry and its connector should be inspected for bare wires, shorts or opens in the wires, and corrosion. Anything possibly covering the ambient air temperature sensor should be removed as well. If necessary, repair or replace any of these components.
The P0073 trouble code should be cleared and the a test drive of the vehicle should be conducted a test drive to see if the trouble code returns.
If the trouble code does not return, the repair is complete. In the event that the trouble code returns immediately, the ambient air temperature sensor needs to be replaced.
If the trouble code doesn’t come back immediately, but still returns, this could be an indication of an intermittent problem regarding the voltage leading to the Power Control Module (PCM). If this is the case, more extensive diagnosis would be required.
In the unlikely event that none of these measures have resolved the ambient air temperature sensor problem and cleared the P0073 code, it is possible the there is a problem with the Power Control Module (PCM). This is extremely rare.
It is common for the ambient air temperature sensor to be replaced without first inspecting the wiring and connector for defects. It is not always necessary to replace the entire ambient air temperature sensor.
The P0073 trouble code is not considered to be one that is serious, as it does not affect the drivability or functioning of the vehicle. This may, however, be one that causes the driver to be uncomfortable as it could prevent the climate control system (heat and/or air condition controls) from working as they should.
It is important to inspect the wires and connector for damage or defects before replacing the ambient air temperature sensor.
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