[SOLVED] Dodge P0685 Code: Fast Fix For Auto Shutdown Relay Failure

The OBD code P0685 for Dodge indicates a problem with the Auto Shutdown (ASD) relay circuit.

Symptoms include the Engine Light being ON.

This code is usually caused by a faulty ASD relay, open/shorted ASD relay harness, poor electrical connection, faulty Engine Control Module (ECM), or a blown ECM fuse.

It is a moderate issue.

To fix, inspect and repair any damaged components, wiring harness, or connectors related to the ASD relay circuit.

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 Dodge p0685 OBD Code

The Dodge P0685 fault code indicates a problem with the ECM/PCM power relay control circuit.

Symptoms: Engine Light ON.
Engine may not start.
Engine may stall while driving.
Engine may run rough.
Engine may lack power.

Causes of the Dodge p0685 OBD Code

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P0685 in Dodge indicates a fault in the ECM/PCM power relay control circuit.

P0685 can be caused by a faulty Auto Shutdown (ASD) relay.
An open or shorted Auto Shutdown (ASD) relay harness.
Poor electrical connection in the Auto Shutdown (ASD) relay circuit.
A faulty Engine Control Module (ECM).
A blown ECM fuse.

Fixing Dodge Error Code p0685 Step By Step

Repair the wiring or connectors related to the ECM/PCM power relay control circuit for code P0685.

To fix the Dodge OBDII code p0685, start by reviewing the possible causes mentioned above.
Visually examine the wiring harness and connectors related to the engine control module (ECM).
Check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
If no visible issues are found, perform a continuity test on the wiring harness to ensure there are no open circuits.
Reset the ECM by disconnecting the battery for a few minutes or using a scan tool.
If the code persists, consider replacing the ECM if all other steps have been completed without resolving the issue.

Cost Of Fixing Dodge p0685 Fault Code

Diagnosing and repairing fault code P0685 on a Dodge typically involves testing and replacing components.

The cost to diagnose and fix Dodge OBD code P0685 typically ranges from $75 to $150, with an estimated repair time of 1. 0 hour.

Costs depend on shop rates, complexity of the issue, and any additional parts needed for the repair.

Details of the Dodge p0685 OBD Code

P0685 in a Dodge indicates a faulty ECM/PCM power relay control circuit.

Dodge OBD code P0685 means ECM/PCM Power Relay Control Circuit Open.

This code is triggered when the Engine Control Module (ECM) detects an open circuit in the power relay control circuit.

The power relay control circuit is responsible for providing power to the ECM/PCM.

When this code is set, it indicates that there is an issue with the power relay control circuit, which can lead to a loss of power to the ECM/PCM.

This can cause various drivability issues and may result in the vehicle not starting or stalling.

To diagnose this code, technicians typically check the power relay, wiring, and connectors for any faults or damage.

They may also perform tests to ensure proper power supply to the ECM/PCM.

If a fault is found, it should be repaired or replaced as necessary to resolve the issue.

Mechanic’s Tech Notes

For Dodge code P0685, check for a faulty ECM/PCM power relay control circuit.

To diagnose and fix OBDII code P0685 on a Dodge, 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.

Visually inspect the wiring harness and connectors for any damage, focusing on broken, bent, or corroded pins.

Ensure all connections are secure.

If the issue persists, consider consulting a professional for further diagnosis and repair.

FAQ

1. What does OBD code P0685 mean in a Dodge vehicle?

OBD code P0685 in a Dodge means a fault with the Auto Shutdown (ASD) relay circuit. Check relay, wiring, and connectors for issues.

2. What are the common symptoms associated with OBD code P0685 in a Dodge vehicle?

Common symptoms of OBD code P0685 in a Dodge vehicle include Engine Light ON, caused by issues with the ASD relay, harness, or ECM. Fix involves inspecting wiring and connectors.

3. How can I diagnose and repair OBD code P0685 in my Dodge vehicle?

Diagnose and repair OBD code P0685 in Dodge: Symptoms Engine Light ON. Causes Faulty ASD relay, harness issues, ECM problems. Fix Inspect wiring, connectors for damage.

Wrap Up

If your Dodge is displaying OBD code p0685 and experiencing starting issues or stalling, it could be caused by a faulty ECM/PCM power relay control circuit, a bad ECM/PCM power relay, or damaged wiring in the power supply circuit.

To address Dodge OBD code p0685, start by checking the ECM/PCM power relay and its control circuit for proper operation.

Inspect the wiring harness for any signs of damage, corrosion, or loose connections.

Test the relay and related components for functionality and replace as needed to resolve the issue.