AutoCodes – Cadillac – P0072 Cadillac

P0072 Cadillac 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 Cadillac 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 407

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0072 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 when the ECM detects the Ambient Air Temperature Sensor signal is more than 88°C (190°F).

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

What does this mean?

What are the Possible Causes of the DTC P0072 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 P0072 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 P0072 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.

Need more information about the P0072 Cadillac code?

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

Need Help with the Code?

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

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 Cadillac Code

What does the OBDII code P0072 indicate for a Cadillac?

The P0072 code indicates that the ambient air temperature sensor circuit is experiencing low voltage, which may suggest a malfunctioning sensor or wiring issues.

What symptoms might I notice if my Cadillac has the P0072 code?

Common symptoms include incorrect temperature readings on the dashboard, poor fuel economy, and potential engine performance issues due to incorrect air temperature data.

What could cause the P0072 code to trigger?

Causes may include a faulty ambient air temperature sensor, damaged wiring or connectors, or issues within the Engine Control Module (ECM).

How can I diagnose the P0072 code?

Start by visually inspecting the ambient air temperature sensor and its wiring for damage. Use a multimeter to check the sensor's voltage output and compare it to the manufacturer's specifications.

What is the typical repair for a P0072 code?

The most common repair involves replacing the ambient air temperature sensor. In some cases, fixing or replacing damaged wiring or connectors may also be necessary.

Is it safe to drive a Cadillac with the P0072 code?

While it may be safe to drive, itâ€™s advisable to address the issue promptly to avoid potential engine performance problems and reduce fuel efficiency.

Can the P0072 code affect my vehicle's emissions?

Yes, since the ambient air temperature affects engine performance and fuel mixture, it can indirectly impact emissions if the vehicle's systems are not functioning properly.

How much does it typically cost to fix the P0072 code?

Repair costs can vary widely, but replacing the ambient air temperature sensor generally ranges from $100 to $300, depending on labor rates and part prices.

Will clearing the P0072 code make the issue go away?

Clearing the code may temporarily turn off the check engine light, but if the underlying issue is not resolved, the code will likely return.