AutoCodes – Hummer – B0688 Hummer

B0688 Hummer Code - Security System Indicator Circuit High

Quick Answer

The security indicator is controlled by the Body Control Module (BCM) based on commands from the immobilizer system or the Content Theft Deterrent (CTD) system. Common causes include Faulty Instrument Panel Cluster (IPC), Instrument Panel Cluster (IPC) harness is open or shorted, Instrument Panel Cluster (IPC) circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B0688 Hummer indicates Security System Indicator Circuit High.
Common causes: Common causes include Faulty Instrument Panel Cluster (IPC), Instrument Panel Cluster (IPC) harness is open or shorted, Instrument Panel Cluster (IPC) circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 1,066

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 18, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B0688 Hummer Description

The security indicator is controlled by the Body Control Module (BCM) based on commands from the immobilizer system or the Content Theft Deterrent (CTD) system. With the ignition OFF, the security indicator is commanded by the CTD system. With the ignition ON, the security indicator is commanded by the immobilizer system. The security indicator is located in the Instrument Panel Cluster (IPC) and is supplied B+ at all times. When the immobilizer or CTD system requests the indicator be commanded ON, the BCM grounds the security indicator control circuit, illuminating the indicator.

OBDII Code B0688 Hummer - Security System Indicator Circuit High - AutoCodes.com — B0688 Hummer Code - Security System Indicator Circuit High

What does this mean?

What are the Possible Causes of the DTC B0688 Hummer?

Faulty Instrument Panel Cluster (IPC)
Instrument Panel Cluster (IPC) harness is open or shorted
Instrument Panel Cluster (IPC) circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B0688 Hummer?

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 B0688 Hummer 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 B0688 Hummer 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 B0688 Hummer Code

1. What are the common symptoms of OBDII code B0688 in a Hummer?

- Common symptoms include the security system indicator staying illuminated or flickering on the dashboard.

2. What does the OBDII code B0688 in a Hummer indicate?

- This code indicates a high circuit condition in the security system indicator.

3. What are the possible causes of the B0688 code in a Hummer?

- Possible causes include a faulty security system indicator, wiring issues, or a malfunction in the security system module.

4. How can I diagnose the B0688 code in my Hummer?

- Diagnosis typically involves inspecting the security system indicator, checking for wiring faults, and using a diagnostic scanner to pinpoint the issue.

5. Is it safe to drive my Hummer with the B0688 code present?

- It is generally safe to drive, but it is recommended to address the issue promptly to ensure the proper functioning of the security system.

6. Can I repair the B0688 code in my Hummer myself?

- Depending on your automotive knowledge and skills, you may be able to repair the issue yourself by replacing the security system indicator or fixing any wiring problems.

7. Will resetting the OBDII code B0688 make it go away permanently?

- Resetting the code may temporarily turn off the warning light, but if the underlying issue is not fixed, the code is likely to reappear.

8. How much does it typically cost to repair the B0688 code in a Hummer?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from around $100 to $300 at a repair shop.

9. Can a B0688 OBDII code cause other problems in my Hummer?

- While the B0688 code itself may not cause other major issues, a malfunctioning security system indicator could potentially affect the overall security system performance.

10. How urgent is it to address the B0688 code in my Hummer?

- While it may not require immediate attention for driving safety, it is recommended to address the issue in a timely manner to prevent any potential security system malfunctions.