AutoCodes – Generic – P15A4

P15A4 Code - AJC Compressor Driver Relay Stays Activated

Quick Answer

The Engine Control Module (ECM) monitors the AJC Compressor Driver Relay. Common causes include Faulty AJC Compressor Driver Relay, AJC Compressor Driver Relay harness is open or shorted, AJC Compressor Driver Relay 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: P15A4 indicates AJC Compressor Driver Relay Stays Activated.
Common causes: Common causes include Faulty AJC Compressor Driver Relay, AJC Compressor Driver Relay harness is open or shorted, AJC Compressor Driver Relay 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 7,635

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 Jan 02, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P15A4 Description

The Engine Control Module (ECM) monitors the AJC Compressor Driver Relay. The ECM sets the OBDII code when the AJC Compressor Driver Relay is not to factory specifications.

OBDII Code P15A4 - AJC Compressor Driver Relay Stays Activated - AutoCodes.com — P15A4 Code - AJC Compressor Driver Relay Stays Activated

What does this mean?

What are the Possible Causes of the DTC P15A4?

Faulty AJC Compressor Driver Relay
AJC Compressor Driver Relay harness is open or shorted
AJC Compressor Driver Relay circuit poor electrical connection

How to Fix the DTC P15A4?

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 P15A4 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 P15A4 code?

Need more information on how to fix the P15A4 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P15A4 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P15A4 Honda — AJC Compressor Driver Relay Stays Activated

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 P15A4 Code

1. What are the common symptoms of OBDII code P15A4 (AJC Compressor Driver Relay Stays Activated)?

- The common symptoms include constant operation of the air conditioning compressor, even when the system is turned off.

2. What are the possible causes of the AJC Compressor Driver Relay staying activated?

- The main causes could be a faulty AJC Compressor Driver Relay, a wiring issue in the circuit, or a problem with the air conditioning control module.

3. How can I diagnose the issue causing OBDII code P15A4?

- You can use a diagnostic scanner to read the code and then inspect the AJC Compressor Driver Relay, wiring connections, and the air conditioning control module for any visible issues.

4. Can a bad compressor itself trigger code P15A4?

- While it's less common, a malfunctioning air conditioning compressor can sometimes cause the AJC Compressor Driver Relay to stay activated, triggering OBDII code P15A4.

5. What are the potential risks of driving with OBDII code P15A4 active?

- Driving with the AJC Compressor Driver Relay constantly activated can lead to excessive wear on the compressor and other related components, potentially causing further damage.

6. How can I reset OBDII code P15A4 after repairing the issue?

- After fixing the underlying problem, you can reset the code using an OBDII scanner or by disconnecting the car's battery for a few minutes to clear the fault code.

7. Is it safe to continue driving my vehicle with OBDII code P15A4 present?

- It is not recommended to drive with the code active as it can lead to unnecessary strain on the air conditioning system components and may result in further damage.

8. Can a DIY enthusiast repair OBDII code P15A4 at home?

- Depending on your skill level and access to tools, you may be able to replace the AJC Compressor Driver Relay or address wiring issues at home. However, more complex problems may require professional assistance.

9. How much does it typically cost to fix OBDII code P15A4?

- The cost of repairing OBDII code P15A4 can vary widely based on the specific issue causing the code, ranging from a simple relay replacement to more involved repairs that may cost several hundred dollars.

10. Are there any preventive measures to avoid OBDII code P15A4 in the future?

- Regular maintenance of the air conditioning system, including checking for any unusual sounds or behaviors, can help prevent issues that may lead to the activation of the AJC Compressor Driver Relay and OBDII code P15A4.