AutoCodes – Volvo – P0071 Volvo

P0071 Volvo Code - Ambient Air Temperature Sensor Performance

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: P0071 Volvo indicates Ambient Air Temperature Sensor Performance.
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 495

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 08, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0071 Volvo 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 if the ECM detects that during the first 20s of run time after the 1 hour soaking period, the difference between the outside air temperature and the engine intake air temperature is greater than 30°C (86°F).

OBDII Code P0071 Volvo - Ambient Air Temperature Sensor Performance - AutoCodes.com — P0071 Volvo Code - Ambient Air Temperature Sensor Performance

What does this mean?

What are the Possible Causes of the DTC P0071 Volvo?

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 P0071 Volvo?

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 P0071 Volvo 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.

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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 P0071 Volvo Code

1. What are the common symptoms of OBDII code P0071 in a Volvo related to the Ambient Air Temperature Sensor performance?

- Common symptoms include inaccurate temperature readings on the dashboard, issues with climate control systems, and potential impacts on engine performance.

2. What are some possible causes of the OBDII code P0071 in a Volvo indicating Ambient Air Temperature Sensor performance issues?

- Potential causes may include a faulty ambient air temperature sensor, damaged wiring or connectors, environmental factors, or issues with the sensor's calibration.

3. How can I diagnose the Ambient Air Temperature Sensor to troubleshoot the P0071 code in my Volvo?

- You can use a multimeter to test the sensor's resistance, inspect the wiring and connectors for damage, and compare the sensor's readings with the actual ambient temperature to diagnose any discrepancies.

4. Are there any simple repair tips for addressing the OBDII code P0071 related to Ambient Air Temperature Sensor performance in a Volvo?

- You can start by checking and cleaning the sensor and its connections, ensuring proper calibration, and replacing the sensor if necessary to resolve the issue.

5. Can a faulty Ambient Air Temperature Sensor impact other systems in the vehicle besides triggering the OBDII code P0071 in a Volvo?

- Yes, a malfunctioning ambient air temperature sensor can affect various systems like the climate control, automatic transmission shifting, and fuel efficiency by providing incorrect temperature data.

6. Is it safe to continue driving my Volvo with the OBDII code P0071 indicating Ambient Air Temperature Sensor issues?

- While it may be safe to drive in the short term, it's best to address the problem promptly to prevent potential impacts on other vehicle systems and ensure accurate temperature readings.

7. How much does it typically cost to replace the Ambient Air Temperature Sensor in a Volvo to resolve the P0071 fault code?

- The cost of replacing the sensor can vary depending on the model of your Volvo and labor costs, but it generally ranges from $50 to $150 for the part, excluding labor charges.

8. Can resetting the OBDII system clear the P0071 fault code related to Ambient Air Temperature Sensor performance in a Volvo temporarily?

- Resetting the system may temporarily clear the code, but if the underlying issue with the ambient air temperature sensor persists, the code is likely to reappear after driving cycles.

9. Are there any preventative maintenance steps I can take to avoid encountering the OBDII code P0071 due to Ambient Air Temperature Sensor problems in my Volvo?

- Regularly inspecting the sensor, keeping it clean, and addressing any wiring issues promptly can help prevent the sensor from malfunctioning and triggering the fault code.

10. How important is the Ambient Air Temperature Sensor for overall vehicle performance and efficiency in a Volvo?

- The ambient air temperature sensor plays a crucial role in providing accurate temperature data for various vehicle systems, contributing to proper engine performance, fuel efficiency, and overall driving comfort.