AutoCodes – Jeep – P0685 Jeep

P0685 Jeep Code - Auto Shutdown Relay Control Circuit Failure

Quick Answer

The Engine Control Module (ECM) monitors the power inputs. Common causes include Faulty Auto Shutdown (ASD) relay, Auto Shutdown (ASD) relay harness is open or shorted, Auto Shutdown (ASD) 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: P0685 Jeep indicates Auto Shutdown Relay Control Circuit Failure.
Common causes: Common causes include Faulty Auto Shutdown (ASD) relay, Auto Shutdown (ASD) relay harness is open or shorted, Auto Shutdown (ASD) 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.

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Code Popularity 26,034

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 05, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
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Code P0685 Jeep Description

The Engine Control Module (ECM) monitors the power inputs. The ECM sets the OBDII code when there is a short or open in Auto Shutdown (ASD) relay circuit

OBDII Code P0685 Jeep - Auto Shutdown Relay Control Circuit Failure - AutoCodes.com — P0685 Jeep Code - Auto Shutdown Relay Control Circuit Failure

What does this mean?

What are the Possible Causes of the DTC P0685 Jeep?

Faulty Auto Shutdown (ASD) relay
Auto Shutdown (ASD) relay harness is open or shorted
Auto Shutdown (ASD) relay circuit poor electrical connection
Faulty Engine Control Module (ECM)
Blown ECM fuse

How to Fix the DTC P0685 Jeep?

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 does this mean?

Code Tech Notes

Check all the Engine Control Module (ECM) fuses, if the fuses are OK, then replacing the Auto Shutdown (ASD) relay should take care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0685 Jeep 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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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.