P0687 2017 GMC Sierra Code - Engine Control Module Power Relay Control Circuit High
Quick Answer
The P0687 code indicates a problem with the Engine Control Module (ECM) power relay control circuit, specifically signaling that the circuit is reading a high voltage condition. Common causes include Faulty Power Relay: A malfunctioning ECM power relay can cause high voltage readings in the control circuit, Damaged Wiring: Frayed, corroded, or shorted wires in the power circuit can lead to erratic voltage levels, Bad Connectors: Loose or corroded connectors can disrupt the flow of electricity to the 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
- P0687 2017 GMC Sierra indicates Engine Control Module Power Relay Control Circuit High.
- Common causes
- Common causes include Faulty Power Relay: A malfunctioning ECM power relay can cause high voltage readings in the control circuit, Damaged Wiring: Frayed, corroded, or shorted wires in the power circuit can lead to erratic voltage levels, Bad Connectors: Loose or corroded connectors can disrupt the flow of electricity to the 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.
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Code P0687 2017 GMC Sierra Description
The P0687 code indicates a problem with the Engine Control Module (ECM) power relay control circuit, specifically signaling that the circuit is reading a high voltage condition. The ECM is a critical component in modern vehicles, responsible for managing engine performance, fuel efficiency, and emissions control. When the power relay control circuit experiences high voltage, it can lead to erratic behavior of the ECM, resulting in poor engine performance, stalling, or even failure to start.
Common Causes of P0687 2017 GMC Sierra
- Faulty Power Relay: A malfunctioning ECM power relay can cause high voltage readings in the control circuit.
- Damaged Wiring: Frayed, corroded, or shorted wires in the power circuit can lead to erratic voltage levels.
- Bad Connectors: Loose or corroded connectors can disrupt the flow of electricity to the ECM.
- Faulty ECM: A defective ECM itself may misinterpret voltage levels, leading to the P0687 code.
- Electrical System Issues: Problems such as a failing battery, alternator, or other electrical components can contribute to high voltage readings.
Symptoms of P0687 2017 GMC Sierra
- Engine Stalling: The vehicle may stall unexpectedly due to the ECM not receiving adequate power.
- Difficulty Starting: The engine may crank but fail to start, indicating a problem with the power supply to the ECM.
- Check Engine Light: The illumination of the check engine light on the dashboard, often accompanied by the P0687 code.
- Poor Engine Performance: Symptoms such as reduced acceleration, misfires, or rough idling can occur due to improper ECM function.
- Increased Emissions: The vehicle may fail emissions tests due to the ECM not optimizing engine performance correctly.
How to Fix P0687 2017 GMC Sierra
- Visual Inspection: Begin with a thorough visual inspection of the ECM power relay, wiring, and connectors for any signs of damage or corrosion.
- Test the Power Relay: Use a multimeter to test the ECM power relay for proper operation. Replace it if it is found to be faulty.
- Check Wiring and Connectors: Inspect and repair any damaged wiring or connectors in the power circuit. Ensure all connections are secure and free of corrosion.
- Scan for Additional Codes: Use an OBD-II scanner to check for any additional diagnostic trouble codes that may indicate other underlying issues.
- ECM Testing: If all other components are functioning correctly, test the ECM itself for faults. If necessary, reprogram or replace the ECM.
Cost to Fix P0687 2017 GMC Sierra
The typical repair costs for addressing a P0687 code can vary widely based on the specific diagnosis and repair needed. On average, you might expect to pay between $200 and $600 for repairs, which could include parts such as a new power relay or wiring harness, along with labor costs. Labor rates typically range from $80 to $150 per hour, depending on the shop's location, the vehicle's make and model, and the engine type. In metropolitan areas or at dealerships, rates may be higher, while independent shops often charge less. It is advisable to check local rates and obtain a detailed estimate from a trusted mechanic for a more precise cost assessment.
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Frequently Asked Questions about P0687 2017 GMC Sierra Code
1. What are the common symptoms of OBDII code P0687 in a 2017 GMC Sierra?
The common symptoms of code P0687 include engine stalling, rough idling, difficulty starting the vehicle, and a noticeable decrease in overall engine performance.
2. What causes the OBDII code P0687 in a 2017 GMC Sierra?
The most common cause of code P0687 in a 2017 GMC Sierra is a malfunctioning engine control module power relay or a problem in the control circuit that regulates its operation.
3. How serious is the OBDII code P0687 in a 2017 GMC Sierra?
Code P0687 can be a serious issue as it directly affects the power supply to the engine control module, which can lead to various performance issues and potential engine failures if left unresolved.
4. Can I continue driving my 2017 GMC Sierra with OBDII code P0687?
It is not recommended to continue driving your vehicle with code P0687 as it can lead to further damage to the engine control module and other components. It's best to address the issue promptly.
5. How can I diagnose OBDII code P0687 in my 2017 GMC Sierra?
Diagnosing code P0687 involves using a diagnostic scanner to retrieve the trouble codes, inspecting the engine control module power relay, and testing the control circuit for any faults or abnormalities.
6. Is it possible to repair OBDII code P0687 in a 2017 GMC Sierra myself?
While some DIY enthusiasts may attempt to repair code P0687 themselves, it is recommended to seek professional help due to the complexity of diagnosing and repairing issues related to the engine control module power relay.
7. What are some tips for repairing OBDII code P0687 in a 2017 GMC Sierra?
Tips for repairing code P0687 include checking and replacing the engine control module power relay, inspecting the control circuit for any loose connections or damaged wiring, and resetting the trouble codes after repairs are completed.
8. How much does it typically cost to repair OBDII code P0687 in a 2017 GMC Sierra?
The cost of repairing code P0687 can vary depending on the extent of the issue and the labor rates of the repair shop. It's best to get a diagnostic assessment to determine the exact cost of repairs.
9. Can a faulty battery or alternator cause OBDII code P0687 in a 2017 GMC Sierra?
While a faulty battery or alternator can indirectly affect the power supply to the engine control module, they are not typically direct causes of code P0687. It's important to diagnose the specific issue accurately.
10. Can OBDII code P0687 in a 2017 GMC Sierra be a recurring problem?
If the underlying issue causing code P0687 is not properly addressed during repairs, it can potentially become a recurring problem. It's crucial to ensure all related components are thoroughly inspected and repaired to prevent recurrence.
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