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Engine-Codes – Generic – P186C

P186C Code - High Side 3 System Short To Power Supply

Quick Answer

The diagnostic trouble code P186C refers to a High Side 3 System Short To Power Supply. Common causes include Damaged wiring or connectors in the high side 3 circuit, Faulty fuel pump control module, Malfunctioning fuel pump relay. 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
P186C indicates High Side 3 System Short To Power Supply.
Common causes
Common causes include Damaged wiring or connectors in the high side 3 circuit, Faulty fuel pump control module, Malfunctioning fuel pump relay.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P186C Description

The diagnostic trouble code P186C refers to a High Side 3 System Short To Power Supply. This code indicates that there is a short circuit on the high side of the fuel pump control system, specifically in circuit 3, which is connected to the power supply. The high side of the fuel pump control system is responsible for regulating the fuel pump's operation, ensuring that the correct amount of fuel is delivered to the engine. When a short to power supply occurs in this system, it can disrupt the fuel pump's functioning, leading to potential performance issues and possible long-term damage if not addressed promptly.

OBDII Code P186C - High Side 3 System Short To Power Supply
P186C Code - High Side 3 System Short To Power Supply

Common Causes of P186C

  1. Damaged wiring or connectors in the high side 3 circuit
  2. Faulty fuel pump control module
  3. Malfunctioning fuel pump relay
  4. Electrical issues in the fuel pump control system
  5. Corrosion or debris affecting the connections in the system

Symptoms of P186C

  1. Engine stalling or rough idling
  2. Lack of power during acceleration
  3. Difficulty starting the vehicle
  4. Surging or erratic engine behavior
  5. Check engine light illuminated on the dashboard

How to Fix P186C

  1. Begin by inspecting the wiring and connectors in the high side 3 circuit for any damage or corrosion. Repair or replace any faulty components as needed.
  2. Check the fuel pump control module and fuel pump relay for proper operation. Replace any components that are malfunctioning.
  3. Clear the diagnostic trouble codes from the vehicle's computer using a scan tool.
  4. Test the fuel pump control system to ensure that the issue has been resolved and that the fuel pump is operating correctly.
  5. If the problem persists, consult a professional mechanic for further diagnosis and repair.

Cost to Fix P186C

The cost of repairing a High Side 3 System Short To Power Supply can vary depending on the specific cause of the issue and the extent of the damage. In general, the repair costs for this type of problem can range from $200 to $500, including parts and labor. However, it's important to note that the actual cost may be higher if additional components need to be replaced or if the issue is more complex. Additionally, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more precise estimate.

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Code P186C Information for Specific Makes

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 P186C Code

1. What are the common symptoms of OBDII code P186C (High Side 3 System Short To Power Supply)?

The common symptoms include engine misfires, rough idling, poor acceleration, and potential stalling.

2. What can cause the OBDII code P186C to trigger?

The code P186C is typically triggered by a short to power supply in the High Side 3 system, which may be caused by damaged wiring, a faulty high side driver module, or a malfunctioning sensor.

3. How serious is the OBDII code P186C issue?

While the code itself may not cause immediate harm to the vehicle, it can lead to poor engine performance and may result in further engine damage if left unresolved.

4. How can I diagnose the cause of OBDII code P186C (High Side 3 System Short To Power Supply)?

Diagnosing this issue involves checking the wiring harness for damage, testing the high side driver module, and inspecting the sensors related to the High Side 3 system.

5. Can I drive my vehicle with the OBDII code P186C present?

It is not recommended to drive the vehicle with this code present, as it can lead to performance issues and potentially cause further damage to the engine.

6. How can I repair OBDII code P186C?

Repairing this code may involve repairing or replacing damaged wiring, replacing the high side driver module, or addressing any issues with the sensors in the High Side 3 system.

7. Can a DIY enthusiast fix the OBDII code P186C issue?

While some experienced DIY enthusiasts may be able to diagnose and repair this issue, it is recommended to seek professional help to ensure the problem is properly resolved.

8. Will resetting the OBDII code P186C make it go away permanently?

Simply resetting the code will not fix the underlying issue causing P186C. It is important to diagnose and repair the root cause to prevent the code from reappearing.

9. How much can I expect to pay to fix OBDII code P186C at a repair shop?

The cost of fixing this code can vary depending on the cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

10. Is it necessary to clear the OBDII code P186C after repairing the issue?

After fixing the underlying problem causing the code, it is recommended to clear the code using an OBDII scanner to ensure the issue has been successfully resolved.

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