AutoCodes – Generic – P145B

P145B 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 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 4,449

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

What does this mean?

What are the Possible Causes of the DTC P145B?

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?

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 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 P145B code?

Need more information on how to fix the P145B code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P145B code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P145B Ford — A/C Demand Not Activated During Self Test
P145B Lincoln — A/C Demand Not Activated During Self Test
P145B Mercury — A/C Demand Not Activated During Self Test

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 Code

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

- Common symptoms include a lack of cold air coming from the A/C system, the A/C not turning on when requested, and the A/C system not working properly.

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

- Possible causes of code P145B include a malfunctioning A/C pressure sensor, a faulty A/C compressor, a wiring issue in the A/C system, or a problem with the HVAC control module.

3. How can I diagnose the OBDII code P145B?

- To diagnose code P145B, you can use an OBDII scanner to read the code and check for any related codes. Inspect the A/C components for any visible damage or signs of wear. Testing the A/C pressure sensor and related wiring can also help pinpoint the issue.

4. Can I continue driving with OBDII code P145B present?

- It is not recommended to continue driving with code P145B present, as it indicates a problem with the A/C system that may lead to further damage if left unresolved.

5. How can I repair OBDII code P145B?

- Repairing code P145B typically involves diagnosing and fixing the root cause of the issue, which may include replacing a faulty A/C pressure sensor, repairing wiring issues, or replacing a malfunctioning A/C compressor.

6. Are there any DIY tips for troubleshooting OBDII code P145B?

- DIY troubleshooting tips may include visually inspecting A/C components for damage, checking A/C system fuses, and ensuring all A/C-related connectors are securely connected.

7. How much does it cost to repair OBDII code P145B at a mechanic?

- The cost of repairing code P145B can vary depending on the root cause of the issue, the labor rates of the mechanic, and the cost of any replacement parts needed. It is recommended to get a diagnosis and repair estimate from a trusted mechanic.

8. Can a faulty A/C pressure sensor trigger OBDII code P145B?

- Yes, a faulty A/C pressure sensor is a common cause of OBDII code P145B as it can prevent the A/C system from activating during self-tests.

9. Will OBDII code P145B affect vehicle performance?

- While OBDII code P145B is related to the A/C system and may not directly affect the vehicle's performance, it can impact comfort and convenience by preventing the A/C system from working properly.

10. How long does it take to repair OBDII code P145B?

- The repair time for code P145B can vary depending on the exact cause of the issue, the availability of replacement parts, and the mechanic's expertise. In general, it may take a few hours to a full day to diagnose and repair the problem.