AutoCodes – GMC – P0690 GMC

P0690 GMC 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 GMC 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 7,707

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 19, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0690 GMC 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 GMC - Electronic Control Module Power Relay Sense Circuit High - AutoCodes.com — P0690 GMC Code - Electronic Control Module Power Relay Sense Circuit High

What does this mean?

What are the Possible Causes of the DTC P0690 GMC?

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 GMC?

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 GMC 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 GMC code?

Need more information on how to fix the P0690 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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

Information for Specific GMC Models

P0690 2014 GMC Sierra — Electronic Control Module Power Relay Sense Circuit High
P0690 2015 GMC Sierra — Electronic Control Module Power Relay Sense Circuit High
P0690 2016 GMC Sierra — Electronic Control Module Power Relay Sense Circuit High
P0690 2017 GMC Sierra — Electronic Control Module Power Relay Sense Circuit High
P0690 2018 GMC Sierra — Electronic Control Module Power Relay Sense Circuit High

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 GMC Code

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

The common symptoms of code P0690 include engine stalling, poor engine performance, and the illumination of the Check Engine light on the dashboard.

2. What does the OBDII code P0690 GMC mean?

The OBDII code P0690 for GMC vehicles refers to the Electronic Control Module Power Relay Sense Circuit High. It indicates a problem with the power relay circuit in the ECM.

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

The possible causes of code P0690 include a faulty power relay, damaged wiring or connectors in the power relay circuit, or a malfunctioning Electronic Control Module (ECM).

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

Diagnosing code P0690 typically involves checking the power relay, inspecting the wiring and connectors in the power relay circuit, and testing the ECM for any faults using a diagnostic scanner.

5. Can I still drive my GMC vehicle with OBDII code P0690?

It is not recommended to drive your GMC vehicle with code P0690 present, as it can lead to engine performance issues and potential further damage if left unresolved.

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

Repairing code P0690 may involve replacing the faulty power relay, repairing or replacing damaged wiring or connectors, or, in some cases, replacing the ECM if it is found to be defective.

7. Will resetting the Check Engine light resolve OBDII code P0690 in my GMC vehicle?

Simply resetting the Check Engine light will not resolve code P0690. It is essential to diagnose the underlying issue causing the code and then perform the necessary repairs.

8. How much does it typically cost to repair OBDII code P0690 in a GMC vehicle?

The cost of repairing code P0690 in a GMC vehicle can vary depending on the specific cause of the issue, but it may range from $200 to $500 or more, including parts and labor.

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

While some DIY enthusiasts may be able to diagnose and repair code P0690 themselves, it is recommended to have the issue addressed by a professional mechanic with experience in ECM and electrical system repairs.

10. How urgent is it to address OBDII code P0690 in a GMC vehicle?

It is advisable to address code P0690 promptly to prevent potential engine performance issues and further damage to the ECM or other components. Delaying repairs can lead to more extensive and costly problems down the line.