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P0690 2015 GMC Sierra 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 2015 GMC Sierra 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 181
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Jul 19, 2022
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Code P0690 2015 GMC Sierra 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 2015 GMC Sierra - Electronic Control Module Power Relay Sense Circuit High - AutoCodes.com
P0690 2015 GMC Sierra Code - Electronic Control Module Power Relay Sense Circuit High
What does this mean?

What are the Possible Causes of the DTC P0690 2015 GMC Sierra?

  • 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 2015 GMC Sierra?

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 2015 GMC Sierra 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 2015 GMC Sierra code?

Need more information on how to fix the P0690 2015 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0690 2015 GMC Sierra 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 2015 GMC Sierra Code

1. What does the OBDII code P0690 mean on a 2015 GMC Sierra?

P0690 indicates an issue with the Electronic Control Module (ECM) Power Relay Sense Circuit, specifically that the voltage is too high.

2. What are the common symptoms of code P0690 in a 2015 GMC Sierra?

Common symptoms include the engine not starting, stalling while driving, a no-crank condition, or the Check Engine Light illuminating.

3. What causes the P0690 code to appear on a 2015 GMC Sierra?

Possible causes include a faulty ECM power relay, shorted wiring or connectors in the relay circuit, a defective ECM, or a blown fuse.

4. Can I drive my 2015 GMC Sierra with a P0690 code?

It’s not recommended, as the vehicle may experience stalling or fail to start, which could leave you stranded or create unsafe driving conditions.

5. How is the P0690 code diagnosed on a 2015 GMC Sierra?

A mechanic will typically check the power relay, inspect associated wiring and connectors, test the ECM, and use a multimeter to measure circuit voltage.

6. How do you fix a P0690 code on a 2015 GMC Sierra?

Repairs may include replacing the ECM power relay, repairing or replacing damaged wiring, clearing blockages in the circuit, or replacing the ECM if necessary.

7. How much does it cost to repair a P0690 code on a 2015 GMC Sierra?

Repair costs vary but typically range from $100 to $500, depending on whether the issue is with the relay, wiring, or ECM itself.

8. Can a dead battery cause the P0690 code on a 2015 GMC Sierra?

A dead or weak battery is not a direct cause but can exacerbate electrical issues, so it’s important to ensure the battery is in good condition.

9. Will clearing the code fix the P0690 issue on a 2015 GMC Sierra?

Clearing the code will reset the Check Engine Light temporarily, but the issue will return if the underlying problem isn’t resolved.

10. How can I prevent the P0690 code from recurring in my 2015 GMC Sierra?

Regularly inspect and maintain the electrical system, including the ECM power relay and wiring, to ensure they are in good condition.

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