AutoCodes – Cadillac – P0690 Cadillac

P0690 Cadillac 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 Cadillac 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 7,781

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

What does this mean?

What are the Possible Causes of the DTC P0690 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 P0690 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 P0690 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 P0690 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 P0690 Cadillac Code

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

- Common symptoms include engine stalling, rough idling, decreased fuel efficiency, and difficulty starting the vehicle.

2. What does the OBDII code P0690 Cadillac Electronic Control Module Power Relay Sense Circuit High mean?

- This code indicates that there is a high voltage condition detected in the power relay sense circuit of the Electronic Control Module (ECM).

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

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

4. How can I diagnose the OBDII code P0690 in my Cadillac?

- Diagnosing this code typically involves using a scan tool to read the code, checking the power relay and its connections, inspecting the ECM wiring, and testing the power relay sense circuit.

5. Can I still drive my Cadillac with the OBDII code P0690 present?

- It is not recommended to drive your Cadillac with this code present, as it can lead to further damage to the ECM and other components. It is best to address the issue promptly.

6. How can I repair OBDII code P0690 in my Cadillac?

- Repairing this code may involve replacing the power relay, repairing any damaged wiring or connectors, or replacing the ECM if necessary. It is recommended to consult a professional mechanic for proper diagnosis and repair.

7. Is resetting the OBDII code P0690 enough to fix the issue?

- Simply resetting the code may temporarily clear the error message, but it will not fix the underlying issue causing the high voltage condition in the power relay sense circuit. Proper diagnosis and repair are necessary.

8. Can a DIY enthusiast fix the OBDII code P0690 in a Cadillac?

- While some DIY enthusiasts may have the skills and knowledge to diagnose and repair this code, it is recommended to consult a professional mechanic, especially when dealing with complex electrical issues like those related to the ECM.

9. How much does it cost to repair OBDII code P0690 in a Cadillac?

- The cost of repairing this code can vary depending on the specific cause of the issue, the extent of the damage, and the labor rates in your area. It is advisable to get a few quotes from different mechanics to compare prices.

10. Will OBDII code P0690 cause my Cadillac to fail an emissions test?

- Yes, this code can cause your Cadillac to fail an emissions test, as it indicates a problem with the ECM power relay sense circuit, which can affect the vehicle's emissions control system. It is important to address this issue before undergoing an emissions test.