P0687 2018 Chevrolet Silverado Code - Engine Control Module Power Relay Control Circuit High
Quick Answer
The P0687 code on a 2018 Chevrolet Silverado indicates a problem with the Engine Control Module (ECM) Power Relay Control Circuit being too high. Common causes include Faulty ECM power relay, Wiring issues in the power relay control circuit, Corrosion or poor connections in the relay circuit. 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 2018 Chevrolet Silverado indicates Engine Control Module Power Relay Control Circuit High.
- Common causes
- Common causes include Faulty ECM power relay, Wiring issues in the power relay control circuit, Corrosion or poor connections in the relay circuit.
- 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 2018 Chevrolet Silverado Description
The P0687 code on a 2018 Chevrolet Silverado indicates a problem with the Engine Control Module (ECM) Power Relay Control Circuit being too high. The ECM power relay is responsible for providing power to the ECM, which is the brain of the vehicle's engine management system. When the power relay control circuit is reading higher than normal, it can lead to issues with the ECM's ability to function properly.
Common Causes of P0687 2018 Chevrolet Silverado
- Faulty ECM power relay
- Wiring issues in the power relay control circuit
- Corrosion or poor connections in the relay circuit
- ECM software or hardware issues
- Electrical system malfunctions
Symptoms of P0687 2018 Chevrolet Silverado
- Check Engine Light illuminated on the dashboard
- Engine misfires or runs rough
- Reduced fuel efficiency
- Engine stalls or struggles to start
- Loss of power while driving
How to Fix P0687 2018 Chevrolet Silverado
- Begin by diagnosing the root cause of the issue using a diagnostic scanner to read the code and pinpoint the problem.
- Inspect the ECM power relay and its connections for any signs of damage, corrosion, or loose connections.
- Test the power relay control circuit for proper voltage and continuity to ensure it is functioning correctly.
- Replace the ECM power relay if it is found to be faulty, ensuring the new relay is compatible with the vehicle's make and model.
- Clear the diagnostic trouble codes, reset the ECM, and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P0687 2018 Chevrolet Silverado
The typical repair costs for addressing a P0687 code on a 2018 Chevrolet Silverado can range from $150 to $300, including parts and labor. However, it's important to note that 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 2018 Chevrolet Silverado Code
1. What does the OBDII code P0687 mean on a 2018 Chevrolet Silverado?
P0687 indicates an issue with the Engine Control Module (ECM) Power Relay Control Circuit being too high, meaning the ECM isn’t receiving proper power or there’s an electrical fault in the circuit.
2. What are the symptoms of a P0687 code on a 2018 Chevrolet Silverado?
Common symptoms include the engine not starting, intermittent stalling, the check engine light illuminating, and potential loss of communication with the ECM.
3. What causes the P0687 code on a 2018 Chevrolet Silverado?
Possible causes include a faulty ECM power relay, damaged wiring or connectors in the relay circuit, a blown fuse, or a defective ECM.
4. Can I drive my 2018 Chevrolet Silverado with a P0687 code?
Driving with a P0687 code is not recommended, as it could lead to engine stalling or failure to start, potentially leaving you stranded.
5. How do I diagnose the P0687 code on a 2018 Chevrolet Silverado?
Start by visually inspecting the ECM power relay, wiring, and connectors for damage. Check the fuse connected to the ECM circuit and use a multimeter to test for proper voltage and continuity.
6. How do I fix the P0687 code on a 2018 Chevrolet Silverado?
Repairs may include replacing a faulty ECM power relay, repairing or replacing damaged wiring, replacing a blown fuse, or reprogramming/repairing the ECM if necessary.
7. How much does it cost to fix the P0687 code on a 2018 Chevrolet Silverado?
Repair costs depend on the issue but typically range from $50–$200 for a relay replacement and higher if ECM repair or replacement is needed.
8. Can a weak battery cause the P0687 code on a 2018 Chevrolet Silverado?
Yes, a weak or failing battery can lead to low voltage in the ECM power relay circuit, potentially triggering the P0687 code.
9. Will clearing the code fix the P0687 issue on my 2018 Chevrolet Silverado?
Clearing the code may temporarily remove the check engine light, but the underlying issue must be resolved to prevent the code from returning.
10. Is the ECM likely to fail with a P0687 code on a 2018 Chevrolet Silverado?
While a faulty ECM is less common, it’s a possibility if all other components in the power relay circuit are functioning correctly.
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