P0686 2014 Chevrolet Silverado Code - Engine Control Module Power Relay Control Circuit Low
Quick Answer
The P0686 diagnostic trouble code (DTC) for a 2014 Chevrolet Silverado relates to the Engine Control Module (ECM) Power Relay Control Circuit being detected as low. Common causes include Faulty ECM power relay, Damaged wiring or connectors in the power relay circuit, Blown fuse related to the ECM power supply. 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 2014 Chevrolet Silverado indicates Engine Control Module Power Relay Control Circuit Low.
- Common causes
- Common causes include Faulty ECM power relay, Damaged wiring or connectors in the power relay circuit, Blown fuse related to the ECM power supply.
- 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 P0686 2014 Chevrolet Silverado Description
The P0686 diagnostic trouble code (DTC) for a 2014 Chevrolet Silverado relates to the Engine Control Module (ECM) Power Relay Control Circuit being detected as low. This indicates that there is an issue with the power relay control circuit that supplies power to the ECM. The ECM, also known as the engine control unit (ECU), plays a crucial role in controlling various engine functions, such as fuel injection, ignition timing, and emissions systems.
Common Causes of P0686 2014 Chevrolet Silverado
- Faulty ECM power relay
- Damaged wiring or connectors in the power relay circuit
- Blown fuse related to the ECM power supply
- Malfunctioning ECM
- Electrical system issues
Symptoms of P0686 2014 Chevrolet Silverado
- Engine misfires or hesitation during acceleration
- Illumination of the check engine light
- Difficulty starting the vehicle
- Rough idling or stalling
- Reduced fuel efficiency
How to Fix P0686 2014 Chevrolet Silverado
- Begin by using a diagnostic scanner to retrieve the specific trouble code and verify the issue with the ECM power relay control circuit.
- Inspect the ECM power relay, wiring, and connectors for any visible damage or corrosion. Replace any faulty components as needed.
- Check the fuses related to the ECM power supply and replace any blown fuses.
- Perform a thorough inspection of the ECM to determine if it is functioning correctly. If the ECM is determined to be faulty, it may need to be replaced.
- Clear the DTC and perform a test drive to ensure that the issue has been resolved and that the vehicle is operating properly.
Cost to Fix P0686 2014 Chevrolet Silverado
The typical repair costs for addressing a P0686 DTC in a 2014 Chevrolet Silverado can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, the cost for parts such as an ECM power relay or a new ECM can range from $100 to $500. Additionally, labor costs at auto repair shops typically range from $80 to $150 per hour. Overall, the total repair costs for this issue could range from $200 to $1000 or more, depending on the specific circumstances. It's recommended to consult with a professional mechanic or auto repair shop to get a more accurate cost estimate based on your vehicle's specific needs.
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Frequently Asked Questions about P0686 2014 Chevrolet Silverado Code
1. What does the OBDII code P0686 mean on a 2014 Chevrolet Silverado?
P0686 indicates that the power relay control circuit for the Engine Control Module (ECM) is reading a low voltage, which could prevent the ECM from functioning properly.
2. What are the common symptoms of code P0686 in a 2014 Chevy Silverado?
Symptoms may include difficulty starting the engine, the engine stalling while driving, poor performance, or the check engine light illuminating.
3. What causes the P0686 code to appear on a 2014 Chevrolet Silverado?
Common causes include a faulty ECM power relay, damaged wiring or connectors in the relay circuit, a blown fuse, or, less commonly, a malfunctioning ECM.
4. Can I drive my 2014 Chevrolet Silverado with the P0686 code?
Driving with this code is not recommended as it can cause unpredictable stalling or starting issues, which may pose a safety risk.
5. How do I diagnose the P0686 code on my 2014 Chevy Silverado?
Begin by checking the ECM power relay and related fuses. Inspect the wiring and connectors in the relay circuit for damage, corrosion, or loose connections. Use a multimeter to test for proper voltage.
6. How can I fix the P0686 code on my 2014 Chevrolet Silverado?
Repairs may include replacing a faulty ECM power relay, repairing or replacing damaged wiring, securing loose connections, or replacing a blown fuse.
7. Is a faulty ECM a likely cause of the P0686 code?
While possible, a faulty ECM is less common. It’s more likely the issue lies with the relay, wiring, or fuse, so these should be checked first.
8. What tools are needed to troubleshoot the P0686 code?
You’ll need a multimeter to test voltage, a diagnostic scan tool to clear the code and verify repairs, and basic hand tools for accessing the relay and wiring.
9. How much does it cost to fix the P0686 code on a 2014 Chevrolet Silverado?
The cost varies depending on the root cause. Replacing an ECM power relay typically costs $20–$50, while wiring repairs or ECM replacement can cost significantly more.
10. Can a weak battery cause the P0686 code to appear?
Yes, a weak or failing battery can cause low voltage in the ECM power relay circuit, potentially triggering the P0686 code. Ensure the battery is in good condition.
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