AutoCodes – Generic – P1547

P1547 Code - A/C System Performance Degraded

Quick Answer

P1547 indicates A/C System Performance Degraded. Common causes include Faulty A/C System, A/C System harness is open or shorted, A/C System circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: P1547 indicates A/C System Performance Degraded.
Common causes: Common causes include Faulty A/C System, A/C System harness is open or shorted, A/C System circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 10,798

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 29, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1547 Description

OBDII Code P1547 - A/C System Performance Degraded - AutoCodes.com — P1547 Code - A/C System Performance Degraded

What does this mean?

What are the Possible Causes of the DTC P1547?

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

How to Fix the DTC P1547?

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 P1547 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 P1547 code?

Need more information on how to fix the P1547 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1547 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1547 Audi — Wastegate Bypass Regulator Valve Short To Ground
P1547 Buick — A/C System Performance Degraded
P1547 Cadillac — A/C System Performance Degraded
P1547 Chevrolet — A/C System Performance Degraded
P1547 GMC — A/C System Performance Degraded
P1547 Mitsubishi — DOR Radiator Tampering Monitor Rationality Check
P1547 Volkswagen — Wastegate Bypass Regulator Valve Short To Ground

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 P1547 Code

1. What are common symptoms of OBDII code P1547 (A/C System Performance Degraded)?

- Common symptoms include weak or warm air coming from the A/C vents, decreased cooling efficiency, and potential A/C system malfunctions.

2. What are some possible causes of OBDII code P1547?

- Potential causes may include low refrigerant levels, a malfunctioning compressor, a faulty pressure sensor, or issues with the A/C control module.

3. How can I diagnose OBDII code P1547 related to A/C system performance?

- To diagnose this code, a professional diagnostic scan tool can be used to retrieve the specific trouble codes and pinpoint the exact issue with the A/C system.

4. How can I address low refrigerant levels as a cause of OBDII code P1547?

- If low refrigerant levels are the issue, the system should be checked for leaks, repaired, and then properly recharged with the correct amount of refrigerant.

5. What should I do if the compressor is found to be malfunctioning with OBDII code P1547?

- In case of a faulty compressor, it will need to be replaced with a new one to restore proper A/C system functionality.

6. Can a faulty pressure sensor trigger OBDII code P1547?

- Yes, a defective pressure sensor can cause this code to be triggered. Replacing the faulty sensor can resolve the issue.

7. How important is it to address OBDII code P1547 promptly?

- It is crucial to address this code promptly to prevent further damage to the A/C system and ensure optimal cooling performance, especially in hot weather.

8. Are there any preventive maintenance tips to avoid OBDII code P1547?

- Regularly servicing the A/C system, checking refrigerant levels, and addressing any minor issues promptly can help prevent the occurrence of this code.

9. Can I reset OBDII code P1547 by disconnecting the battery?

- While disconnecting the battery may clear the code temporarily, it is essential to diagnose and address the underlying issue to prevent the code from reappearing.

10. Is it recommended to attempt DIY repairs for OBDII code P1547?

- Due to the complexity of A/C systems and potential safety hazards, it is advisable to seek professional help for diagnosing and repairing OBDII code P1547 related to A/C system performance issues.