P0687 2014 Chevrolet Silverado Code - Engine Control Module Power Relay Control Circuit High
Quick Answer
The P0687 diagnostic trouble code (DTC) for a 2014 Chevrolet Silverado indicates that there is a high voltage condition in the engine control module (ECM) power relay control circuit. Common causes include Faulty ECM Power Relay: A malfunctioning ECM power relay can cause high voltage in the control circuit, Wiring Issues: Damaged or corroded wiring connections can disrupt the power relay control circuit, ECM Malfunction: A faulty ECM itself can also trigger this code. 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
- P0687 2014 Chevrolet Silverado indicates Engine Control Module Power Relay Control Circuit High.
- Common causes
- Common causes include Faulty ECM Power Relay: A malfunctioning ECM power relay can cause high voltage in the control circuit, Wiring Issues: Damaged or corroded wiring connections can disrupt the power relay control circuit, ECM Malfunction: A faulty ECM itself can also trigger this code.
- 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 P0687 2014 Chevrolet Silverado Description
The P0687 diagnostic trouble code (DTC) for a 2014 Chevrolet Silverado indicates that there is a high voltage condition in the engine control module (ECM) power relay control circuit. The ECM power relay is responsible for providing power to the ECM, which is the brain of the vehicle's engine management system. This code suggests that there is an issue with the control circuit that regulates the power relay, potentially leading to a disruption in the ECM's ability to function properly.
Common Causes of P0687 2014 Chevrolet Silverado
- Faulty ECM Power Relay: A malfunctioning ECM power relay can cause high voltage in the control circuit.
- Wiring Issues: Damaged or corroded wiring connections can disrupt the power relay control circuit.
- ECM Malfunction: A faulty ECM itself can also trigger this code.
- Electrical Short: An electrical short in the system can lead to high voltage in the circuit.
- Battery Voltage Surge: A sudden surge in battery voltage can affect the power relay control circuit.
Symptoms of P0687 2014 Chevrolet Silverado
- Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
- Engine Performance Issues: The vehicle may exhibit poor acceleration, rough idling, or stalling due to the disrupted power supply to the ECM.
- Starting Problems: The vehicle may have difficulty starting or fail to start at all.
- Reduced Fuel Efficiency: High voltage in the ECM power relay control circuit can lead to increased fuel consumption.
- Electrical Issues: Other electrical components in the vehicle may malfunction or behave erratically.
How to Fix P0687 2014 Chevrolet Silverado
- Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble code and perform a thorough inspection of the ECM power relay control circuit.
- Check Wiring Connections: Inspect the wiring connections for any damage, corrosion, or loose connections. Repair or replace as needed.
- Test ECM Power Relay: Test the ECM power relay to ensure it is functioning correctly. Replace if necessary.
- Address Electrical Shorts: Identify and repair any electrical shorts in the system that may be causing high voltage in the circuit.
- Clear Codes and Test Drive: Clear the DTC from the ECM memory, and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P0687 2014 Chevrolet Silverado
The typical repair costs for addressing the P0687 code on a 2014 Chevrolet Silverado can range from $150 to $400, including parts and labor. However, it's important to note that 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. Rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less. It's advisable to check local rates for a more precise estimate.
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Frequently Asked Questions about P0687 2014 Chevrolet Silverado Code
1. What does the OBDII code P0687 mean on a 2014 Chevrolet Silverado?
P0687 indicates an issue with the Engine Control Module (ECM) Power Relay Control Circuit, specifically that the circuit voltage is too high.
2. What are the common symptoms of the P0687 code?
Symptoms may include the engine not starting, stalling, a lack of power, and the Check Engine Light being illuminated.
3. What causes the P0687 code in a 2014 Chevrolet Silverado?
Common causes include a faulty ECM power relay, damaged wiring or connectors in the ECM power relay circuit, or an ECM failure.
4. Can a bad ECM cause the P0687 code?
Yes, a malfunctioning ECM can result in the P0687 code if it cannot properly regulate the relay control circuit.
5. How do you diagnose a P0687 code?
Diagnosis involves checking the ECM power relay, inspecting the wiring and connectors for damage or corrosion, and testing the ECM for proper functionality.
6. Can I still drive my Silverado with a P0687 code?
Driving with a P0687 code is not recommended, as it may lead to stalling or a complete inability to start the vehicle.
7. How do you fix the P0687 code?
Repair steps may include replacing a faulty ECM power relay, repairing damaged wiring, cleaning corroded connectors, or replacing the ECM if necessary.
8. How much does it cost to fix a P0687 code?
Repair costs vary depending on the issue, ranging from $50 for a new relay to $1,000 or more if the ECM needs replacement.
9. Can a weak battery cause the P0687 code?
Yes, a weak or failing battery can cause voltage irregularities, which may trigger the P0687 code.
10. Is the P0687 code a serious issue?
Yes, the P0687 code is serious because it can prevent the engine from starting or cause it to stall while driving. Immediate attention is advised.
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