AutoCodes – Mercury – P145B Mercury

P145B Mercury Code - A/C Demand Not Activated During Self Test

Quick Answer

The Engine Control Module (ECM) monitors the A/C Pressure Sensor. Common causes include Faulty A/C Pressure Sensor, A/C Pressure Sensor harness is open or shorted, A/C Pressure 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: P145B Mercury indicates A/C Demand Not Activated During Self Test.
Common causes: Common causes include Faulty A/C Pressure Sensor, A/C Pressure Sensor harness is open or shorted, A/C Pressure 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 1,030

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Oct 01, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P145B Mercury Description

The Engine Control Module (ECM) monitors the A/C Pressure Sensor. The ECM sets the OBDII code when the A/C Pressure Sensor is not to factory specifications.

OBDII Code P145B Mercury - A/C Demand Not Activated During Self Test - AutoCodes.com — P145B Mercury Code - A/C Demand Not Activated During Self Test

What does this mean?

What are the Possible Causes of the DTC P145B Mercury?

Faulty A/C Pressure Sensor
A/C Pressure Sensor harness is open or shorted
A/C Pressure Sensor circuit poor electrical connection

How to Fix the DTC P145B Mercury?

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 P145B Mercury 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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Get the P145B Mercury 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 P145B Mercury Code

1. What are the common symptoms of OBDII code P145B Mercury (A/C Demand Not Activated During Self Test)?

- Common symptoms include the air conditioning system not functioning properly, reduced cooling performance, and the A/C compressor not engaging.

2. What are the possible causes of OBDII code P145B Mercury?

- The code P145B can be triggered by issues such as a faulty A/C pressure transducer, wiring problems, a defective A/C control module, or low refrigerant levels.

3. How can I diagnose the cause of OBDII code P145B Mercury?

- To diagnose the issue, you may need to perform a thorough inspection of the A/C system components, check the wiring for any damage, test the A/C pressure transducer, and scan for any other related trouble codes.

4. What are some repair tips for resolving OBDII code P145B Mercury?

- Repair tips may include checking and replacing the A/C pressure transducer, repairing any damaged wiring, resetting the A/C control module, and ensuring proper refrigerant levels in the system.

5. Can I drive my vehicle with OBDII code P145B Mercury?

- It is not recommended to drive your vehicle with the code P145B active, as it can lead to reduced A/C performance and potential damage to the air conditioning system components.

6. How much does it typically cost to repair OBDII code P145B Mercury?

- The cost of repairing OBDII code P145B can vary depending on the specific cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

7. Is OBDII code P145B Mercury a common issue in Mercury vehicles?

- While the frequency of this code may vary, A/C-related issues like P145B can occur in Mercury vehicles, particularly in models with electronic climate control systems.

8. Can I reset OBDII code P145B Mercury on my own?

- You may be able to reset the code using an OBDII scanner, but it is important to diagnose and address the underlying cause to prevent the code from recurring.

9. How long does it typically take to repair OBDII code P145B Mercury?

- The repair time for OBDII code P145B can vary depending on the cause of the issue and the complexity of the repair, but it may take a few hours to a full day in some cases.

10. Are there any DIY fixes for OBDII code P145B Mercury?

- While some basic checks like inspecting wiring connections can be done DIY, resolving OBDII code P145B often requires professional diagnosis and repair due to the complexity of the A/C system in modern vehicles.