AutoCodes – Cadillac – P0073 Cadillac

P0073 Cadillac Code - Ambient Air Temperature Sensor Circuit High 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: P0073 Cadillac indicates Ambient Air Temperature Sensor Circuit High 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 1,187

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 P0073 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 less than -40°C (-40°F).

OBDII Code P0073 Cadillac - Ambient Air Temperature Sensor Circuit High Voltage - AutoCodes.com — P0073 Cadillac Code - Ambient Air Temperature Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0073 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 P0073 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 P0073 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 P0073 Cadillac Code

1. What are the common symptoms of OBDII code P0073 in a Cadillac related to the Ambient Air Temperature Sensor Circuit High Voltage?

- Common symptoms include inaccurate temperature readings on the vehicle's display, issues with the climate control system, and potential effects on engine performance.

2. What are the possible causes of OBDII code P0073 in a Cadillac?

- The code P0073 in a Cadillac is often triggered by a faulty ambient air temperature sensor, wiring issues, or a problem with the sensor circuit.

3. How can I diagnose the Ambient Air Temperature Sensor Circuit High Voltage issue in my Cadillac?

- To diagnose the issue, you can use a multimeter to test the resistance of the ambient air temperature sensor and check for any visible damage to the sensor or its wiring.

4. Can a faulty ambient air temperature sensor impact the vehicle's fuel efficiency?

- Yes, a faulty ambient air temperature sensor can impact the vehicle's fuel efficiency by causing incorrect readings that may affect the engine's performance.

5. How can I repair the Ambient Air Temperature Sensor Circuit High Voltage issue in my Cadillac?

- Repairing the issue may involve replacing the ambient air temperature sensor, repairing any damaged wiring, or resetting the OBDII system after addressing the root cause.

6. Is it safe to continue driving my Cadillac with OBDII code P0073 triggered?

- While it is generally safe to drive with this code, it is essential to address the issue promptly to prevent potential issues with engine performance and accurate temperature readings.

7. Can extreme weather conditions affect the operation of the ambient air temperature sensor in a Cadillac?

- Yes, extreme weather conditions such as extreme heat or cold can impact the operation of the ambient air temperature sensor and potentially trigger OBDII code P0073.

8. How long does it typically take to repair the Ambient Air Temperature Sensor Circuit High Voltage issue in a Cadillac?

- The repair time can vary depending on the exact cause of the issue, but it may take anywhere from 30 minutes to a few hours to diagnose and repair the problem.

9. Will resetting the OBDII system clear the P0073 code in a Cadillac?

- Resetting the OBDII system may temporarily clear the code, but it is essential to address the underlying issue with the ambient air temperature sensor to prevent the code from reappearing.

10. Can a DIY enthusiast replace the ambient air temperature sensor in a Cadillac to resolve the P0073 code?

- Yes, replacing the ambient air temperature sensor can be a DIY-friendly repair for those with basic automotive repair skills and the necessary tools.