AutoCodes – Generic – P0072

P0072 Code - Ambient Air Temperature Sensor Circuit Low Voltage

Quick Answer

The Engine Control Module (ECM) monitors the ambient air temperature sensor with a low reference circuit and signal circuit. Common causes include Faulty Ambient Air Temperature Sensor, Ambient Air Temperature Sensor harness is open or shorted, Ambient Air Temperature Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0072 indicates Ambient Air Temperature Sensor Circuit Low Voltage.
Common causes: Common causes include Faulty Ambient Air Temperature Sensor, Ambient Air Temperature Sensor harness is open or shorted, Ambient Air Temperature Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 31,446

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 16, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0072 Description

The Engine Control Module (ECM) monitors the ambient air temperature sensor with a low reference circuit and signal circuit. The ECM monitors the voltage drop across the sensor, which is inversely proportional to temperature. When the ambient air temperature is cold, the resistance of the sensor is high. When the ambient air temperature is warm, the resistance of the sensors is low. The engine control module converts the voltage value to a temperature value and sends the value to the Display Module via serial data. The Display Module displays the temperature. The Diagnostic Trouble Code (DTC) will be set when the ECM detects the Ambient Air Temperature Sensor signal is more than 88°C (190°F).

OBDII Code P0072 - Ambient Air Temperature Sensor Circuit Low Voltage - AutoCodes.com — P0072 Code - Ambient Air Temperature Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0072?

Faulty Ambient Air Temperature Sensor
Ambient Air Temperature Sensor harness is open or shorted
Ambient Air Temperature Sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0072?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0072 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0072 code?

Need more information on how to fix the P0072 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0072 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P0072 Audi — Ambient Air Temperature Sensor Circuit Low
P0072 BMW — Ambient Sensor Circuit Low
P0072 Buick — Ambient Air Temperature Sensor Circuit Low Voltage
P0072 Cadillac — Ambient Air Temperature Sensor Circuit Low Voltage
P0072 Chevrolet — Ambient Air Temperature Sensor Circuit Low Voltage
P0072 Chrysler — Ambient Air Temperature Sensor Circuit Low
P0072 Dodge — Ambient Air Temperature Sensor Circuit Low
P0072 Ford — Ambient Air Temperature Sensor Circuit 'A' Low
P0072 GMC — Ambient Air Temperature Sensor Circuit Low Voltage
P0072 Jeep — Ambient Air Temperature Sensor Circuit Low
P0072 Lincoln — Ambient Air Temperature Sensor Circuit 'A' Low
P0072 MINI — Ambient Sensor Circuit Low
P0072 Mitsubishi — Ambient Air Temperature Sensor Circuit Low
P0072 Volkswagen — Ambient Air Temperature Sensor Circuit Low
P0072 Volvo — Outside Temperature Sensor Signal Too Low Or Too High

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0072 Code

1. What are the common symptoms of OBDII code P0072 (Ambient Air Temperature Sensor Circuit Low Voltage)?

- Common symptoms include inaccurate temperature readings on the vehicle's display, poor fuel efficiency, and potential issues with the air conditioning system.

2. What can cause the OBDII code P0072 to trigger?

- The code P0072 can be triggered by a faulty ambient air temperature sensor, damaged wiring or connectors in the sensor circuit, or issues with the sensor's power supply.

3. How serious is the OBDII code P0072 (Ambient Air Temperature Sensor Circuit Low Voltage)?

- While this code may not cause immediate harm to the vehicle, it can lead to poor performance and fuel efficiency if left unresolved. It is important to address the issue promptly.

4. Can I continue driving with the OBDII code P0072?

- It is generally safe to continue driving with this code, but it is recommended to have the issue diagnosed and repaired as soon as possible to prevent further complications.

5. How can I diagnose the OBDII code P0072 at home?

- You can diagnose the code P0072 by using an OBDII scanner to read the code, visually inspecting the ambient air temperature sensor and its wiring for any visible damage, and testing the sensor's resistance with a multimeter.

6. What are some possible repair tips for OBDII code P0072?

- Repair tips include replacing the ambient air temperature sensor, repairing or replacing damaged wiring or connectors in the sensor circuit, and ensuring the sensor is receiving proper power and ground.

7. Can weather conditions affect the ambient air temperature sensor circuit?

- Yes, extreme weather conditions such as extreme heat or cold can affect the ambient air temperature sensor's readings, potentially triggering the OBDII code P0072.

8. How much does it typically cost to repair the OBDII code P0072?

- The cost of repairing the code P0072 can vary depending on the underlying issue. Replacing the ambient air temperature sensor can cost between $50 to $200, while repairing wiring or connectors may be more affordable.

9. Will resetting the OBDII code P0072 make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to reappear. It is important to diagnose and repair the root cause of the problem.

10. Can a DIY enthusiast fix the OBDII code P0072 on their own?

- Depending on their skill level and access to tools, a DIY enthusiast may be able to fix the code P0072 by following repair guides, but it is recommended to consult a professional mechanic for accurate diagnosis and repair.