OBD-II Trouble Codes

P0070 Code: Ambient Air Temperature Sensor Circuit

Reading Time: 3 minutes

On-board diagnostic (OBD) codes are designed to help mechanics and drivers identify potential issues in a vehicle. But before attempting any fixes to resolve these codes, it’s important to know exactly what they mean. 

The P0070 code is one of the thousands of error codes that may be set by your vehicle’s primary computer. Read on to learn more about its possible triggers and common symptoms.

What Does the P0070 Code Mean?

Diagnostic trouble code (DTC) P0070 stands for “Ambient Air Temperature Sensor Circuit.” It is logged when the powertrain control module (PCM) detects a potential issue in the ambient air temperature sensor or the sensor’s circuit.

obd check
If the information sent by the ambient air temperature sensor varies significantly from the input of the intake air temperature (IAT) and engine coolant temperature (ECT) sensors, the PCM will recognize this as a discrepancy and log code P0070.

The ambient air temperature sensor monitors ambient air and sends the data it has gathered to the PCM. This information is used to display outside air temperature and to modify the operation of the automatic climate control system (if needed). 

However, if the information sent by the ambient air temperature sensor varies significantly from the input of the intake air temperature (IAT) and engine coolant temperature (ECT) sensors, the PCM will recognize this as a discrepancy and log code P0070.

Note: The definition of code P0070 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Possible Causes of the P0070 Code?

Code P006B can be set for a number of reasons. Here are the most common:

What are the Common Symptoms of the P0070 Code?

You may notice the following symptoms if you drive a vehicle with a stored P0070 trouble code:

adjusting car air conditioning system
A malfunctioning A/C is a symptom of code P0070.

How to Diagnose the P0070 Code

Diagnosing code P0070 may be tricky, as it is a generic code with several possible causes. A good rule of thumb is to only follow the diagnostic procedures specified by your vehicle’s manufacturer. This is because the process may vary from model to model. For instance, the process for diagnosing a code P0070 on a BMW may not be the same as the process for diagnosing a code P0070 on a VW.

Refer to a vehicle-specific repair manual for the appropriate diagnostic strategies. If you don’t have much experience when it comes to DIY automotive repair, it may be best to leave this job to the experts.

How to Fix the P0070 Code

P0070 may share similar triggers and symptoms with other trouble codes. However, that does not mean they share solutions as well. All vehicles are different, so you should always refer to the factory repair information specific to your car before DIY-ing any repairs. 
Consult a repair manual or repair database before attempting any fixes. Look for confirmed solutions that are specific to your vehicle. If you aren’t confident in your automotive repair skills, it may be best to enlist the help of a professional.

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