AutoCodes – Generic – P3002

P3002 Code - HV ECU Communication Malfunction

Quick Answer

The battery Electronic Control Unit (ECU) receives information of the AC ECU, system main relay connection signals, etc. Common causes include Faulty Hybrid Vehicle (HV) Electronic Control Unit (ECU), Hybrid Vehicle (HV) Electronic Control Unit (ECU) harness is open or shorted, Hybrid Vehicle (HV) Electronic Control Unit (ECU) 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: P3002 indicates HV ECU Communication Malfunction.
Common causes: Common causes include Faulty Hybrid Vehicle (HV) Electronic Control Unit (ECU), Hybrid Vehicle (HV) Electronic Control Unit (ECU) harness is open or shorted, Hybrid Vehicle (HV) Electronic Control Unit (ECU) 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 11,919

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 Feb 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P3002 Description

The battery Electronic Control Unit (ECU) receives information of the AC ECU, system main relay connection signals, etc. sent from the Hybrid Vehicle (HV) ECU, and stores Diagnostic Trouble Codes (DTC) when an error is detected in the receives information.

OBDII Code P3002 - HV ECU Communication Malfunction - AutoCodes.com — P3002 Code - HV ECU Communication Malfunction

What does this mean?

What are the Possible Causes of the DTC P3002?

Faulty Hybrid Vehicle (HV) Electronic Control Unit (ECU)
Hybrid Vehicle (HV) Electronic Control Unit (ECU) harness is open or shorted
Hybrid Vehicle (HV) Electronic Control Unit (ECU) circuit poor electrical connection

How to Fix the DTC P3002?

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 P3002 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 P3002 code?

Need more information on how to fix the P3002 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P3002 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P3002 Lexus — HV ECU Communication Malfunction
P3002 Toyota — HV ECU Communication Malfunction

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 P3002 Code

1. What are common symptoms of OBDII code P3002 HV ECU Communication Malfunction?

- Common symptoms include poor acceleration, reduced fuel efficiency, and difficulty starting the vehicle.

2. What are possible causes of the HV ECU Communication Malfunction code P3002?

- Potential causes include damaged wiring, faulty HV ECU module, communication bus issues, or a weak battery.

3. How can I diagnose the HV ECU Communication Malfunction code P3002?

- Use a diagnostic scanner to read the code, inspect the wiring for visible damage, and test the HV ECU module for proper functioning.

4. Can a weak battery cause the P3002 code to appear?

- Yes, a weak battery can cause communication issues between modules and trigger the HV ECU Communication Malfunction code.

5. How can I repair the HV ECU Communication Malfunction code P3002?

- Repair options may include fixing damaged wiring, replacing the HV ECU module, ensuring proper communication bus connections, and checking the battery health.

6. Is it safe to continue driving with the P3002 code present?

- It is not recommended to drive with the HV ECU Communication Malfunction code active, as it can lead to further issues with the hybrid system.

7. Can a DIY enthusiast fix the P3002 code issue at home?

- Depending on the root cause, some DIY enthusiasts may be able to address the issue by inspecting wiring, but complex repairs may require professional assistance.

8. How much does it cost to repair the HV ECU Communication Malfunction code P3002?

- Repair costs can vary widely based on the underlying issue, ranging from a simple wiring repair to a more expensive HV ECU module replacement.

9. Will resetting the code make it go away permanently?

- Resetting the code may temporarily clear the error, but if the root cause is not addressed, the code is likely to reappear.

10. Are there any preventive measures to avoid the P3002 code in the future?

- Regular maintenance, keeping the electrical system in good condition, and addressing any issues promptly can help prevent the HV ECU Communication Malfunction code from occurring.