B0688 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 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.
Code B0688 Description
What are the Possible Causes of the DTC B0688?
- 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?
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 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.
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Information for Specific Makes
- B0688 Buick — Security System Indicator Circuit High
- B0688 Cadillac — Security System Indicator Circuit High
- B0688 Chevrolet — Security System Indicator Circuit High
- B0688 GMC — Security System Indicator Circuit High
- B0688 Hummer — Security System Indicator Circuit High
- B0688 Pontiac — Security System Indicator Circuit High
- B0688 Saturn — Security System Indicator Circuit High
Frequently Asked Questions about B0688 Code
1. What does OBDII code B0688 mean?
Code B0688 indicates a high voltage condition in the Security System Indicator Circuit, which is part of the vehicle's anti-theft system.
2. What are the common symptoms of code B0688?
Symptoms may include the security indicator light staying on or flashing, difficulty starting the vehicle, or a no-start condition.
3. What causes the B0688 code to trigger?
The code is usually caused by a short to power, damaged wiring, a malfunctioning security indicator light, or a faulty body control module (BCM).
4. Can I still drive my car with the B0688 code active?
While the car may start and drive in some cases, the security system may not function properly. In severe cases, the vehicle may not start at all.
5. How is the B0688 code diagnosed?
A technician will inspect the wiring and connectors in the security system circuit, test the indicator light, and check for shorts or open circuits.
6. Can a dead battery cause the B0688 code?
A dead or weak battery is unlikely to directly trigger this code, but voltage fluctuations during startup could contribute to electrical malfunctions.
7. How do you fix the B0688 code?
Repairs may involve fixing or replacing damaged wiring, replacing the security indicator light, or reprogramming or replacing the body control module.
8. Is the B0688 code specific to certain vehicles?
This code is generally found on GM vehicles, but the exact troubleshooting and repair steps may vary by make and model.
9. How much does it cost to fix the B0688 code?
Repair costs can range from $50 for minor wiring repairs to over $500 if the body control module requires replacement and reprogramming.
10. Can I reset the B0688 code without repairing the issue?
Clearing the code without addressing the root cause is not recommended, as the issue may persist or worsen over time.
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