OBD code P0685 for Honda indicates a fault with the Powertrain Control Module (PCM) Power Relay.
This affects the PCM’s ability to control various engine functions.
Symptoms include the Engine Light being illuminated.
The issue is commonly caused by a faulty PCM Power Relay or related wiring issues.
It is a moderate concern.
To fix, inspect and repair any damaged wiring or connectors related to the PCM Power Relay.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 10.0 (Out of 10) |
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Symptoms of the Honda p0685 OBD Code
The vehicle may experience issues related to the ECM/PCM power relay control circuit.
- Symptoms for Honda OBD code P0685 may include: Engine Light ON.
- Engine may not start.
- Engine may stall while driving.
- Engine may run rough.
- Engine may have poor acceleration.
- Engine may have poor fuel economy.
- Engine may have difficulty shifting gears.
- Engine may go into limp mode.
- Engine may emit black smoke from the exhaust.
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Causes of the Honda p0685 OBD Code
P0685 in a Honda typically indicates a fault related to the ECM/PCM power relay control circuit.
- P0685 can be caused by a faulty Powertrain Control Module (PCM) Power Relay (PGMFI Main Relay 1).
- A Powertrain Control Module Power Relay harness that is open or shorted.
- A Powertrain Control Module Power Relay circuit with poor electrical connection.
- A blown Powertrain Control Module fuse.
- Or a faulty Powertrain Control Module.
Fixing Honda Error Code p0685 Step By Step
Repair the wiring or connectors related to the ECM/PCM Power Relay Control Circuit.
- To fix Honda OBDII code P0685, start by reviewing the possible causes mentioned above.
- Visually examine the wiring harness and connectors related to the engine control module power relay control circuit.
- Check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- Test the engine control module power relay and replace it if necessary.
- Clear the fault codes and perform a test drive to verify that the issue has been resolved.
Cost Of Fixing Honda p0685 Fault Code
Diagnosing and repairing Honda fault code P0685 may involve testing and replacing the ECM relay.
The cost to diagnose and fix a Honda OBD code P0685 typically ranges from $75 to $150, based on an estimated repair time of 1. 0 hour.
Factors like shop rates and complexity of the repair can influence the final cost.
Details of the Honda p0685 OBD Code
P0685 in a Honda indicates a problem with the ECM/PCM power relay control circuit.
Code P0685 for Honda vehicles indicates a ECM/PCM Power Relay Control Circuit Malfunction.
This code is triggered when the Engine Control Module (ECM) detects a problem with the power relay control circuit, which is responsible for providing power to the ECM/PCM.
The signal or system involved in this fault code is the power relay control circuit that supplies power to the ECM/PCM.
Mechanic’s Tech Notes
Detailed information on diagnosing and repairing Honda fault code P0685 related to ECM/PCM power relay control circuit.
To diagnose and fix OBDII code P0685 in a Honda, start by checking the Transmission Control Module (TCM) power and ground using a multimeter.
Verify TCM communication over the Controller Area Network (CAN) using a scan tool.
If the TCM does not respond, reprogramming or reflashing may be necessary.
Additionally, visually inspect the wiring harness and connectors for any damage, and check connector pins for signs of being broken, bent, pushed out, or corroded.
This thorough inspection will help identify and address any issues causing the P0685 fault code.
FAQ
The common cause of OBD code P0685 in a Honda vehicle is a faulty Powertrain Control Module (PCM) Power Relay (PGMFI Main Relay 1).
Diagnose and fix OBD code P0685 in your Honda by checking PCM Power Relay, harness, and connections for faults. Inspect wiring, connectors, and components for damage or corrosion.
It is not safe to continue driving with OBD code P0685 in your Honda. Check and repair the PCM power relay, harness, and connections to prevent potential issues.
Wrap Up
If your Honda is displaying OBD code p0685 and experiencing starting issues or stalling, it may be caused by a faulty ECM/PCM power relay control circuit.
This could be due to a bad relay, damaged wiring, or poor connections in the circuit.
To address Honda OBD code p0685, start by checking the ECM/PCM power relay and its connections.
Inspect the relay for proper operation, examine the wiring harness for any damage, and ensure all connectors are securely attached.
Replace any faulty components and repair any damaged wiring to resolve the issue.
