AutoCodes – Buick – P0690 Buick

P0690 Buick Code - Electronic Control Module Power Relay Sense Circuit High

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: P0690 Buick indicates Electronic Control Module Power Relay Sense Circuit High.
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 4,375

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 P0690 Buick 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 P0690 Buick - Electronic Control Module Power Relay Sense Circuit High - AutoCodes.com — P0690 Buick Code - Electronic Control Module Power Relay Sense Circuit High

What does this mean?

What are the Possible Causes of the DTC P0690 Buick?

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 P0690 Buick?

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 P0690 Buick 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 P0690 Buick code?

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Need Help with the Code?

Get the P0690 Buick code diagnosed by a professional: Find a repair shop in your area

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 P0690 Buick Code

1. What are the common symptoms of OBDII code P0690 in a Buick?

- Common symptoms include illuminated check engine light, engine performance issues, and possibly a no-start condition.

2. What does the OBDII code P0690 in a Buick indicate?

- The code P0690 indicates a problem with the Electronic Control Module (ECM) power relay sense circuit being high.

3. What are the possible causes of OBDII code P0690 in a Buick?

- Possible causes include a faulty ECM power relay, damaged wiring or connectors in the power relay circuit, or a malfunctioning ECM.

4. How can I diagnose the cause of OBDII code P0690 in my Buick?

- Diagnose the code by checking the power relay and its connections, inspecting the wiring for any damage, and testing the ECM for proper functioning.

5. Can I drive my Buick with an OBDII code P0690?

- It is not recommended to drive your Buick with an unresolved P0690 code, as it can lead to potential engine performance issues or even a no-start situation.

6. How do I repair OBDII code P0690 in my Buick?

- Repair involves identifying and fixing the root cause, which may include replacing the ECM power relay, repairing damaged wiring, or replacing the ECM itself.

7. Is it safe to reset the OBDII code P0690 in my Buick without fixing the issue?

- It is not advisable to simply reset the code without addressing the underlying problem, as it may lead to recurring issues and potential long-term damage.

8. Will OBDII code P0690 cause damage to other components in my Buick?

- Ignoring the P0690 code can potentially cause damage to the ECM or other related components over time, affecting the overall performance of your Buick.

9. Can a DIY enthusiast fix OBDII code P0690 in a Buick?

- Depending on your skill level and access to tools, some DIY enthusiasts may be able to diagnose and address the issue causing the P0690 code.

10. How much can I expect to pay for professional repairs related to OBDII code P0690 in a Buick?

- Repair costs for OBDII code P0690 can vary depending on the specific cause, but expect to pay anywhere from $150 to $500 for parts and labor at a professional repair shop.