AutoCodes – Cadillac – P0071 Cadillac

P0071 Cadillac 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 Cadillac 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 465

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

What does this mean?

What are the Possible Causes of the DTC P0071 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

1. What are the common symptoms of OBDII code P0071 on a Cadillac related to the Ambient Air Temperature Sensor Performance?

The common symptoms include inaccurate temperature readings on the dashboard, issues with the HVAC system, and potential fluctuations in engine performance.

2. What are the possible causes of OBDII code P0071 on a Cadillac?

The code P0071 in a Cadillac is typically triggered by a faulty ambient air temperature sensor, damaged wiring or connectors, or a problem with the sensor circuit.

3. How can I diagnose the cause of OBDII code P0071 on my Cadillac?

To diagnose the issue, you can use a multimeter to test the resistance of the ambient air temperature sensor, visually inspect the sensor and its wiring for any damage, and check for any loose connections.

4. Can a faulty ambient air temperature sensor affect the fuel efficiency of my Cadillac?

Yes, a faulty ambient air temperature sensor can impact the fuel efficiency of your Cadillac by providing incorrect data to the engine control module, leading to improper fuel mixture adjustments.

5. What is the recommended repair for OBDII code P0071 on a Cadillac?

The recommended repair is to replace the faulty ambient air temperature sensor, repair any damaged wiring or connectors, and clear the error code using an OBDII scanner.

6. Is it safe to continue driving my Cadillac with OBDII code P0071 related to the ambient air temperature sensor?

It is generally safe to drive your Cadillac with this code as it primarily affects the HVAC system and temperature readings. However, it is recommended to address the issue promptly to prevent any potential impact on engine performance.

7. Can extreme weather conditions contribute to triggering OBDII code P0071 on a Cadillac?

Extreme weather conditions such as excessive heat or cold can sometimes lead to false readings from the ambient air temperature sensor, potentially triggering the P0071 trouble code.

8. Will resetting the error code fix OBDII code P0071 on a Cadillac?

Resetting the error code may temporarily clear the warning light, but if the underlying issue with the ambient air temperature sensor is not resolved, the code is likely to reappear.

9. How much does it typically cost to replace the ambient air temperature sensor on a Cadillac to address OBDII code P0071?

The cost of replacing the ambient air temperature sensor on a Cadillac can vary based on the model and location, but it generally ranges from $50 to $150 for the part, excluding labor charges.

10. Can a DIY enthusiast replace the ambient air temperature sensor to resolve OBDII code P0071 on a Cadillac?

Yes, replacing the ambient air temperature sensor is considered a relatively straightforward task and can be done by a DIY enthusiast with basic automotive repair skills and tools.