P0686 2014 GMC Sierra Code - Engine Control Module Power Relay Control Circuit Low
Quick Answer
The P0686 diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates a problem with the Engine Control Module (ECM) power relay control circuit being low. Common causes include Faulty ECM power relay, Wiring issues in the power relay control circuit, Loose or corroded electrical connections. 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 GMC Sierra indicates Engine Control Module Power Relay Control Circuit Low.
- Common causes
- Common causes include Faulty ECM power relay, Wiring issues in the power relay control circuit, Loose or corroded electrical connections.
- 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 GMC Sierra Description
The P0686 diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates a problem with the Engine Control Module (ECM) power relay control circuit being low. 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. The power relay control circuit is essential for providing power to the ECM, ensuring proper operation.
Common Causes of P0686 2014 GMC Sierra
- Faulty ECM power relay
- Wiring issues in the power relay control circuit
- Loose or corroded electrical connections
- ECM software or hardware malfunction
- Battery voltage supply problems
Symptoms of P0686 2014 GMC Sierra
- Rough idling
- Stalling
- Poor acceleration
- Difficulty starting
- Engine performance issues
How to Fix P0686 2014 GMC Sierra
- Begin by inspecting the ECM power relay and related wiring for any visible damage or corrosion.
- Test the power relay using a multimeter to ensure it is functioning correctly.
- Check the electrical connections to the ECM for tightness and cleanliness.
- If necessary, replace the ECM power relay or repair any damaged wiring.
- Clear the DTC and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P0686 2014 GMC Sierra
The typical repair costs for addressing the P0686 code on a 2014 GMC Sierra can range from $100 to $300, depending on the specific cause of the issue and the cost of replacement parts. Labor rates at auto repair shops can vary, typically ranging from $80 to $150 per hour. It is advisable to check with local shops for a more accurate estimate based on your location and vehicle specifics.
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Frequently Asked Questions about P0686 2014 GMC Sierra Code
1. What does the OBDII code P0686 mean on a 2014 GMC Sierra?
P0686 indicates an issue with the Engine Control Module (ECM) Power Relay Control Circuit being too low, suggesting a possible electrical fault or relay problem.
2. What are the common symptoms of code P0686 in a 2014 GMC Sierra?
Symptoms may include difficulty starting the engine, stalling, reduced performance, or a complete no-start condition along with an illuminated check engine light.
3. What causes the P0686 code to appear in a 2014 GMC Sierra?
Common causes include a faulty ECM power relay, damaged wiring, corroded or loose electrical connections, or a malfunctioning ECM.
4. Can I drive my 2014 GMC Sierra with the P0686 code?
Driving with this code is not recommended, as it can lead to unreliable engine performance or cause the vehicle to stall unexpectedly.
5. How do I diagnose the P0686 code in my GMC Sierra?
Start by inspecting the ECM power relay, checking for damaged wiring or corroded connections, and testing the relay and circuit for proper voltage and continuity.
6. How do I fix the P0686 code on a 2014 GMC Sierra?
Repairs may involve replacing the ECM power relay, repairing or replacing damaged wiring, cleaning corroded connections, or, in rare cases, replacing the ECM.
7. How much does it cost to repair a P0686 code on a GMC Sierra?
Repair costs vary depending on the cause but generally range from $100 to $500, with relay replacement being on the lower end and ECM replacement costing more.
8. Can a weak battery cause the P0686 code on a GMC Sierra?
Yes, a weak or failing battery can cause voltage issues that may trigger this code. Ensure the battery is in good condition before further diagnosis.
9. Does the P0686 code mean my ECM is bad?
Not necessarily. While a faulty ECM is possible, the issue is more commonly related to the power relay or wiring. Thorough diagnosis is essential.
10. Can I clear the P0686 code without fixing it on my 2014 GMC Sierra?
Clearing the code without addressing the root cause may temporarily turn off the check engine light, but the issue will likely return until properly repaired.
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