P0687 Isuzu Code - Engine Control Module Power Relay Control Circuit High
Quick Answer
The Engine Control Module (ECM) monitors the power inputs. Common causes include Faulty Engine Control Module (ECM) power relay, ECM power relay harness is open or shorted, ECM power relay circuit poor electrical connection. 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 Isuzu indicates Engine Control Module Power Relay Control Circuit High.
- Common causes
- Common causes include Faulty Engine Control Module (ECM) power relay, ECM power relay harness is open or shorted, ECM power relay circuit poor electrical connection.
- 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.
Code P0687 Isuzu Description
What are the Possible Causes of the DTC P0687 Isuzu?
- Faulty Engine Control Module (ECM) power relay
- ECM power relay harness is open or shorted
- ECM power relay circuit poor electrical connection
- Faulty ECM
How to Fix the DTC P0687 Isuzu?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0687 Isuzu code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0687 Isuzu Code
1. What does the OBDII code P0687 mean on an Isuzu vehicle?
P0687 indicates an issue with the Engine Control Module (ECM) power relay control circuit, specifically that the circuit is experiencing a high voltage condition.
2. What are the common symptoms of code P0687 in an Isuzu?
Symptoms may include the engine not starting, stalling while driving, poor performance, or the check engine light being illuminated.
3. What causes the P0687 code on an Isuzu?
Possible causes include a faulty ECM power relay, damaged wiring or connectors in the relay circuit, a blown fuse, or a malfunctioning ECM.
4. Can I drive my Isuzu with a P0687 code?
Driving with a P0687 code is not recommended, as it can lead to unpredictable engine performance or failure to start.
5. How do I diagnose the P0687 code on an Isuzu?
Start by inspecting the ECM power relay, wiring, and connectors for damage. Check the relay's operation and test for proper voltage and ground in the circuit.
6. How do I fix the P0687 code on an Isuzu?
Repairs might involve replacing the ECM power relay, repairing damaged wiring or connectors, replacing a blown fuse, or in rare cases, replacing the ECM.
7. How much does it cost to fix the P0687 code on an Isuzu?
The cost can vary depending on the issue. Replacing a power relay might cost $50–$200, while ECM repairs or replacements could be significantly more.
8. Can a bad battery cause the P0687 code in an Isuzu?
Yes, a weak or failing battery can cause voltage irregularities that may trigger a P0687 code.
9. What tools are needed to diagnose the P0687 code on an Isuzu?
You’ll need an OBDII scanner, a multimeter for voltage testing, and possibly a wiring diagram for your specific vehicle.
10. Does clearing the code fix the P0687 issue in an Isuzu?
Clearing the code may turn off the check engine light temporarily, but if the underlying issue is not resolved, the code will return.
Discuss the causes and fixes for P0687 Isuzu OBDII Code
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