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P0686 2015 Chevrolet Silverado Code - Engine Control Module Power Relay Control Circuit Low

Quick Answer

The P0686 diagnostic trouble code (DTC) for a 2015 Chevrolet Silverado refers to the Engine Control Module (ECM) Power Relay Control Circuit being detected as low. Common causes include Faulty power relay, Damaged wiring or connectors in the power relay circuit, Malfunctioning ECM. 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
P0686 2015 Chevrolet Silverado indicates Engine Control Module Power Relay Control Circuit Low.
Common causes
Common causes include Faulty power relay, Damaged wiring or connectors in the power relay circuit, Malfunctioning ECM.
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 14, 2024
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Code P0686 2015 Chevrolet Silverado Description

The P0686 diagnostic trouble code (DTC) for a 2015 Chevrolet Silverado refers to the Engine Control Module (ECM) Power Relay Control Circuit being detected as low. This code indicates that there is an issue with the power relay control circuit that supplies power to the ECM. The ECM is a crucial component of the vehicle's engine management system, responsible for controlling various functions such as fuel injection, ignition timing, and emissions control. When the power relay control circuit is detected as low, it means that there is a problem with the voltage level reaching the ECM, potentially leading to malfunctions in engine performance and overall drivability.

OBDII Code P0686 2015 Chevrolet Silverado - Engine Control Module Power Relay Control Circuit Low
P0686 2015 Chevrolet Silverado Code - Engine Control Module Power Relay Control Circuit Low

Common Causes of P0686 2015 Chevrolet Silverado

  1. Faulty power relay.
  2. Damaged wiring or connectors in the power relay circuit.
  3. Malfunctioning ECM.
  4. Weak or failing battery.
  5. Corrosion or poor connections in the power relay circuit.

Symptoms of P0686 2015 Chevrolet Silverado

  1. Engine misfires or hesitation during acceleration.
  2. Check Engine Light illuminated on the dashboard.
  3. Reduced fuel efficiency.
  4. Engine stalling or difficulty starting.
  5. Rough idling or erratic engine behavior.

How to Fix P0686 2015 Chevrolet Silverado

  1. Begin by conducting a thorough inspection of the power relay, wiring, and connectors for any visible damage or corrosion.
  2. Test the power relay using a multimeter to ensure it is functioning correctly.
  3. Check the voltage levels at the ECM to determine if the power supply is within the specified range.
  4. Replace the power relay if it is found to be faulty, ensuring proper installation and secure connections.
  5. Clear the DTC and perform a test drive to verify that the issue has been resolved and that the ECM is receiving adequate power.

Cost to Fix P0686 2015 Chevrolet Silverado

The typical repair costs for addressing a P0686 code on a 2015 Chevrolet Silverado can vary depending on the specific cause of the issue. In general, the cost of replacing a power relay can range from $50 to $150, while the labor cost for diagnosis and repair can range from $100 to $300. Overall, the total repair cost for this issue may fall between $150 and $450, including parts and labor. It is important to note that these estimates are approximate and can vary based on factors such as location, labor rates, and the need for additional repairs or parts replacement. It is advisable to consult with a qualified mechanic or auto repair shop for a more accurate cost estimate based on the specific circumstances of the vehicle.

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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 P0686 2015 Chevrolet Silverado Code

1. What does the OBDII code P0686 mean on a 2015 Chevrolet Silverado?

P0686 indicates a problem with the Engine Control Module (ECM) Power Relay Control Circuit, specifically that the voltage is lower than expected.

2. What are the common symptoms of a P0686 code?

Symptoms may include difficulty starting the engine, engine stalling, reduced power, or a no-start condition.

3. What causes the P0686 code to appear?

Common causes include a faulty ECM power relay, damaged wiring or connectors in the relay circuit, a blown fuse, or a malfunctioning ECM.

4. Can a bad battery cause a P0686 code?

Yes, a weak or failing battery can result in low voltage to the ECM power relay, triggering the P0686 code.

5. How is the P0686 code diagnosed?

A mechanic will typically check the ECM relay, inspect wiring and connectors for damage or corrosion, test voltage levels, and use a scan tool to monitor the ECM power relay circuit.

6. What are some common fixes for the P0686 code?

Repairs may include replacing the ECM power relay, repairing or replacing damaged wiring, cleaning corroded connectors, or, in rare cases, replacing the ECM.

7. Can I drive my 2015 Chevrolet Silverado with a P0686 code?

It is not recommended to drive with this code, as it can lead to engine stalling or a no-start condition, potentially leaving you stranded.

8. How much does it cost to fix a P0686 code?

The cost depends on the root cause. Replacing an ECM relay can cost $20-$50 for the part, while wiring repairs or ECM replacement can be significantly higher, ranging from $100 to $1,000 or more.

9. Does clearing the P0686 code fix the problem?

Clearing the code will turn off the check engine light temporarily, but the underlying issue must be resolved to prevent the code from returning.

10. Can a P0686 code damage the engine?

While the code itself may not directly damage the engine, it can lead to stalling or no-start conditions, which can be dangerous in certain driving situations.

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