AutoCodes – Mercury – P065B Mercury

P065B Mercury Code - Generator Control Circuit Range/Performance

Quick Answer

The Engine Control Module (ECM) uses the generator turn ON signal circuit to control the generator. Common causes include Faulty Generator (Alternator), Generator harness is open or shorted, Generator circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P065B Mercury indicates Generator Control Circuit Range/Performance.
Common causes: Common causes include Faulty Generator (Alternator), Generator harness is open or shorted, Generator circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,999

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 04, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P065B Mercury Description

The Engine Control Module (ECM) uses the generator turn ON signal circuit to control the generator. A high side driver within the ECM allows the ECM to turn the generator ON and OFF. When Generator operation is desired, the ECM sends a 5 volt signal to the voltage regulator via the generator turn on signal circuit. This causes the voltage regulator to begin controlling the generator field circuit. Once the Generator is enabled by the ECM, the voltage regulator controls generator output independently of the ECM. Under certain operating conditions, the ECM can turn Off the generator by turning Off the 5 volt signal on the generator turn on signal circuit. The ECM sets the OBDII when the generator does not respond to the ECM ON signal.

OBDII Code P065B Mercury - Generator Control Circuit Range/Performance - AutoCodes.com — P065B Mercury Code - Generator Control Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC P065B Mercury?

Faulty Generator (Alternator)
Generator harness is open or shorted
Generator circuit poor electrical connection

How to Fix the DTC P065B 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 P065B 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.

Need more information about the P065B Mercury code?

Need more information on how to fix the P065B Mercury code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P065B 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 P065B Mercury Code

1. What are the common symptoms of OBDII code P065B in a Mercury vehicle?

- Common symptoms include issues with the generator, such as improper charging, dimming lights, and electrical system malfunctions.

2. What can cause the OBDII code P065B to be triggered in a Mercury car?

- The code P065B can be triggered due to a faulty generator control module, wiring issues, or a malfunctioning generator.

3. How can I diagnose the OBDII code P065B in my Mercury vehicle?

- Diagnosing the code typically involves checking the generator control module, inspecting the wiring for any damage, and testing the generator's performance.

4. Can a bad battery trigger the OBDII code P065B in a Mercury car?

- Yes, a weak or faulty battery can sometimes lead to the code P065B being triggered due to issues with the charging system.

5. What are some repair tips for fixing the OBDII code P065B in a Mercury vehicle?

- Repair tips may include replacing the generator control module, repairing damaged wiring, checking the generator's output, and ensuring proper battery functioning.

6. Is it safe to continue driving with the OBDII code P065B illuminated in my Mercury vehicle?

- It is not recommended to continue driving with the code illuminated, as it may lead to further electrical system issues and potential breakdowns.

7. How much does it typically cost to repair the OBDII code P065B in a Mercury car?

- Repair costs for the code P065B may vary depending on the exact cause of the issue, but it is advisable to budget for potential module replacements or wiring repairs.

8. Can I reset the OBDII code P065B in my Mercury vehicle using an OBDII scanner?

- Yes, you can reset the code using an OBDII scanner, but it is important to address the underlying issue causing the code to prevent it from reoccurring.

9. Are there any recalls or technical service bulletins related to the OBDII code P065B in Mercury vehicles?

- It is recommended to check with a Mercury dealership or online resources for any relevant recalls or technical service bulletins related to the code P065B in your specific vehicle model.

10. How can regular maintenance help prevent the OBDII code P065B in my Mercury car?

- Regular maintenance, including checking the battery, generator, and electrical system components, can help prevent issues that may trigger the code P065B in your Mercury vehicle.