AutoCodes – Cadillac – P0689 Cadillac

P0689 Cadillac Code - Electronic Control Module Power Relay Sense Circuit Low

Quick Answer

The powertrain relay is a normally open relay. Common causes include Weak battery, Low voltage while cranking, Faulty Engine Control Module (ECM) power relay. 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: P0689 Cadillac indicates Electronic Control Module Power Relay Sense Circuit Low.
Common causes: Common causes include Weak battery, Low voltage while cranking, Faulty Engine Control Module (ECM) power relay.
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 4,686

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 Jul 18, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0689 Cadillac Description

The powertrain relay is a normally open relay. The relay armature is held in the open position by spring tension. Battery positive voltage is supplied directly to the relay coil and the armature contact at all times. The Engine Control Module (ECM) supplies the ground path to the relay coil control circuit via an internal integrated circuit called an Output Driver Module (ODM). The ODM output control is configured to operate as a low side driver for the powertrain relay. The ODM for the powertrain relay also incorporates a fault detection circuit, which is continuously monitored by the ECM. When the ECM commands the powertrain relay ON, ignition 1 voltage is supplied to the ECM, and to several additional circuits.

OBDII Code P0689 Cadillac - Electronic Control Module Power Relay Sense Circuit Low - AutoCodes.com — P0689 Cadillac Code - Electronic Control Module Power Relay Sense Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0689 Cadillac?

Weak battery
Low voltage while cranking
Faulty Engine Control Module (ECM) power relay
ECM power relay harness is open or shorted
ECM power relay circuit poor electrical connection
Blown ECM fuse
Faulty ECM

How to Fix the DTC P0689 Cadillac?

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 P0689 Cadillac 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.

Need more information about the P0689 Cadillac code?

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Need Help with the Code?

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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.

Frequently Asked Questions about P0689 Cadillac Code

1. What are the common symptoms of OBDII code P0689 in a Cadillac?

- Common symptoms include rough idling, stalling, reduced engine power, and difficulty starting the vehicle.

2. What causes the Electronic Control Module Power Relay Sense Circuit Low code in a Cadillac?

- The code P0689 in a Cadillac is typically triggered by a faulty electronic control module power relay, damaged wiring, or a malfunctioning electronic control module.

3. How can I diagnose the Electronic Control Module Power Relay Sense Circuit Low code in my Cadillac?

- Diagnosing this code involves using a OBDII scanner to retrieve the specific code, checking the wiring and connections related to the electronic control module relay, and testing the relay itself.

4. Can a bad battery or alternator cause the P0689 code in a Cadillac?

- Yes, a weak or failing battery, as well as a faulty alternator, can cause voltage irregularities that trigger the Electronic Control Module Power Relay Sense Circuit Low code.

5. What are the repair options for fixing the P0689 code in a Cadillac?

- Repair options include replacing the electronic control module power relay, repairing any damaged wiring or connections, and ensuring the battery and alternator are functioning properly.

6. Is it safe to continue driving my Cadillac with the P0689 code present?

- It is not recommended to continue driving your Cadillac with the P0689 code present, as it can lead to unpredictable engine behavior and potential stalling, which can be dangerous.

7. Can I reset the P0689 code in my Cadillac using an OBDII scanner?

- While you can clear the code using an OBDII scanner, it is important to address the underlying issue causing the code to prevent it from reoccurring.

8. How much does it typically cost to repair the P0689 code in a Cadillac?

- The cost of repairing the P0689 code can vary depending on the specific cause, but it may range from $100 to $300 for parts and labor.

9. Will the P0689 code cause my Cadillac to fail an emissions test?

- Yes, the presence of the P0689 code may cause your Cadillac to fail an emissions test, as it indicates a problem with the electronic control module power relay sense circuit.

10. Can I prevent the P0689 code from occurring in the future?

- Regular maintenance, such as checking the battery and alternator health, as well as ensuring proper wiring connections, can help prevent the recurrence of the P0689 code in your Cadillac.