P0686 2018 Chevrolet Silverado Code - Engine Control Module Power Relay Control Circuit Low
Quick Answer
The P0686 diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado indicates a problem with the Engine Control Module (ECM) power relay control circuit being low. Common causes include Faulty ECM power relay, Damaged wiring or connectors in the power relay control circuit, Weak or dead battery. 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 2018 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 control circuit, Weak or dead battery.
- 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 2018 Chevrolet Silverado Description
The P0686 diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado indicates a problem with the Engine Control Module (ECM) power relay control circuit being low. The ECM power relay is responsible for supplying power to the ECM, which is the brain of the vehicle's engine management system. When the power relay control circuit is low, it means that the voltage level in the circuit is below the specified threshold, causing a malfunction in the power relay's operation.
Common Causes of P0686 2018 Chevrolet Silverado
- Faulty ECM power relay
- Damaged wiring or connectors in the power relay control circuit
- Weak or dead battery
- Malfunctioning ECM
- Corrosion or poor connections in the power relay circuit
Symptoms of P0686 2018 Chevrolet Silverado
- Engine misfires or rough idle
- Reduced engine power
- Check Engine Light illuminated
- Difficulty starting the vehicle
- Poor fuel economy
How to Fix P0686 2018 Chevrolet Silverado
- Begin by performing a thorough inspection of the ECM power relay, wiring, and connectors for any visible damage or corrosion.
- Test the power relay using a multimeter to check for proper voltage levels and continuity.
- If the power relay is faulty, replace it with a new one following the manufacturer's guidelines.
- Check and repair any damaged wiring or connectors in the power relay control circuit.
- Clear the DTC and perform a test drive to ensure the issue has been resolved.
Cost to Fix P0686 2018 Chevrolet Silverado
The typical repair costs for addressing a P0686 code on a 2018 Chevrolet Silverado can range from $100 to $300, including parts and labor. However, 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. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less.
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Frequently Asked Questions about P0686 2018 Chevrolet Silverado Code
1. What does the P0686 code mean on a 2018 Chevrolet Silverado?
The P0686 code indicates an issue with the Engine Control Module (ECM) Power Relay Control Circuit being too low, which can disrupt the ECM's power supply.
2. What are the common symptoms of code P0686 in a 2018 Chevrolet Silverado?
Common symptoms include difficulty starting the engine, intermittent stalling, poor engine performance, or the vehicle not starting at all.
3. What causes the P0686 code to appear?
Possible causes include a faulty ECM power relay, damaged wiring or connectors in the ECM power relay circuit, a blown fuse, or a malfunctioning ECM.
4. Can a bad battery trigger code P0686 in a Chevrolet Silverado?
Yes, a weak or failing battery can cause voltage issues that might result in the P0686 code being triggered.
5. How do you diagnose the P0686 code on a 2018 Silverado?
Start by checking the ECM power relay, inspecting wiring and connectors for damage, testing the relay circuit for proper voltage, and verifying the integrity of the battery and fuses.
6. Is it safe to drive a 2018 Chevrolet Silverado with a P0686 code?
Driving with a P0686 code is not recommended since it can lead to unpredictable stalling or failure to start, potentially leaving you stranded.
7. How do you fix the P0686 code on a 2018 Chevrolet Silverado?
Repairs may include replacing the ECM power relay, repairing or replacing damaged wiring, cleaning or securing loose connections, or replacing a faulty ECM if needed.
8. How much does it cost to repair the P0686 code on a Silverado?
The repair cost can range from $50 for a simple relay replacement to $1,000 or more if the ECM needs replacement, depending on labor and parts.
9. Can I reset the P0686 code without fixing the issue?
Clearing the code without addressing the root cause will likely result in the code returning, as the underlying issue remains unresolved.
10. Does the P0686 code always mean the ECM is faulty?
No, the ECM itself is not always the issue; often, the problem lies in the relay, wiring, or power circuit connected to the ECM.
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