AutoCodes – GMC – C0691 GMC

C0691 GMC Code - Damper Control Relay Circuit Range

Quick Answer

Battery voltage for the strut actuators is supplied to the Electronic Suspension Control (ESC) module through the damper drive relay circuit. Common causes include Faulty Damper Control Relay, Damper Control Relay harness is open or shorted, Damper Control Relay circuit poor electrical connection. 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: C0691 GMC indicates Damper Control Relay Circuit Range.
Common causes: Common causes include Faulty Damper Control Relay, Damper Control Relay harness is open or shorted, Damper Control Relay circuit poor electrical connection.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 798

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 31, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code C0691 GMC Description

Battery voltage for the strut actuators is supplied to the Electronic Suspension Control (ESC) module through the damper drive relay circuit. The ESC module energizes the damper relay by opening and closing an internal ground for the damping relay coil control circuit. The ESC module monitors the damper drive relay circuit and each strut actuator high-side and low-side drive circuits for fault conditions.

OBDII Code C0691 GMC - Damper Control Relay Circuit Range - AutoCodes.com — C0691 GMC Code - Damper Control Relay Circuit Range

What does this mean?

What are the Possible Causes of the DTC C0691 GMC?

Faulty Damper Control Relay
Damper Control Relay harness is open or shorted
Damper Control Relay circuit poor electrical connection

How to Fix the DTC C0691 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 C0691 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 C0691 GMC code?

Need more information on how to fix the C0691 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0691 GMC 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 C0691 GMC Code

1. What are common symptoms of OBDII code C0691 GMC (Damper Control Relay Circuit Range)?

- Common symptoms include issues with the HVAC system, such as inconsistent temperature control or no air blowing from the vents.

2. What can cause the OBDII code C0691 GMC to trigger?

- The code C0691 GMC is typically triggered by a malfunction in the damper control relay circuit, which may be caused by faulty wiring, a damaged relay, or a problem with the HVAC control module.

3. How can I diagnose the cause of OBDII code C0691 GMC?

- To diagnose the cause of the code, you can use a diagnostic scanner to retrieve the specific fault codes, check the wiring and connections related to the damper control relay, and test the relay itself for proper functionality.

4. What are some possible repair tips for OBDII code C0691 GMC?

- Repair tips may include checking and repairing any damaged wiring or connections, replacing the faulty damper control relay, or reprogramming the HVAC control module if necessary.

5. Can I continue driving my vehicle with OBDII code C0691 GMC?

- It is generally not recommended to continue driving your vehicle with unresolved OBDII codes, as they can indicate underlying issues that may affect the vehicle's performance and safety.

6. How much does it typically cost to repair OBDII code C0691 GMC?

- The cost of repair for OBDII code C0691 GMC can vary depending on the specific cause of the issue, but it may involve expenses for parts replacement, labor, and diagnostic services.

7. Is it possible to reset OBDII code C0691 GMC without repairing the issue?

- While clearing the code may temporarily turn off the check engine light, it will not fix the underlying problem causing the code to trigger. It is recommended to diagnose and repair the issue to prevent further issues.

8. Can extreme weather conditions affect the damper control relay circuit and trigger OBDII code C0691 GMC?

- Yes, extreme weather conditions such as excessive heat or moisture can potentially damage the wiring or components related to the damper control relay circuit, leading to the code C0691 GMC being triggered.

9. Will OBDII code C0691 GMC affect the overall performance of my vehicle?

- OBDII code C0691 GMC is related to the HVAC system and may not directly impact the overall performance of the vehicle. However, it can affect the comfort and functionality of the climate control system.

10. How can I prevent OBDII code C0691 GMC from recurring in the future?

- To prevent the recurrence of OBDII code C0691 GMC, it is important to address and repair the underlying cause of the issue, perform regular maintenance checks on the HVAC system, and ensure the wiring and components are in good condition.