Meaning and Explanation of Error Code B0068
B0068 – Left Ceiling Curtain Airbag Module Driver Circuit
What is error code B0068?
Code B0068 refers to the vehicle’s passive safety system, specifically the activation circuit for the left-side ceiling airbag. This error indicates a problem with the circuit responsible for activating this airbag in the event of an accident. The curtain airbag system is designed to protect passengers’ heads during side collisions. The presence of error B0068 may lead to a malfunction of this system, increasing the risk of injury in an accident. Code B0068 indicates a fault in the left-side ceiling airbag deployment circuit. This could be due to an open circuit, short circuit, or high resistance in the circuit.
Symptoms of Error Code B0068
- The airbag warning light on the dashboard is illuminated.
- An OBD2 scanner displays code B0068.
- The airbag does not deploy in an accident (this can only be discovered during diagnosis after an accident).
Main Causes of Error Code B0068
- Damaged or worn wiring in the airbag circuit.
- Improperly connected or corroded connectors.
- Faulty airbag module.
- Faulty Safety Management Unit (SDM).
Error Code B0068 in Common Vehicles
Chevrolet B0068: In Chevrolet models such as the Malibu and Impala, error B0068 is often related to damaged wiring in the left-side roof pillar area.
GMC B0068: In GMC models such as the Sierra and Yukon, the cause of the error may be corrosion of the connectors due to moisture.
Cadillac B0068: In Cadillac models such as the CTS and Escalade, error B0068 may be caused by a faulty safety control unit.
Buick B0068: In Buick models such as the Enclave and LaCrosse, the error may occur due to worn wiring or poor connector contact.
Saturn B0068: In Saturn models such as the Aura and Outlook, the cause of error B0068 may be damage to the airbag module.
How to diagnose error code B0068?
- Connect the OBD2 diagnostic scanner to the vehicle and read the error codes.
- Check the wiring and connectors in the left side curtain airbag circuit for damage or corrosion.
- Test the resistance of the airbag deployment circuit.
- Check the functionality of the airbag module.
- Diagnose the Safety Control Module (SDM) for malfunctions.
Possible Causes and Diagnostic Methods
| Possible Cause | How to Check? |
|---|---|
| Damaged wiring | Visual inspection for breaks or damage |
| Corroded or poor contact in connectors | Inspect and clean contact points |
| Airbag module malfunction | Diagnose using specialized equipment |
| SDM control unit malfunction | Scan and check for other errors |
Tools needed: OBD2 scanner, multimeter, power tool kit, contact cleaner
How to fix error code B0068? (Solution to the problem)
Simple Repair Methods
- Clean and reconnect the connectors in the airbag circuit.
- Replace damaged wire segments.
In-depth Diagnostic and Repair Solutions
- Replace the left side curtain airbag module.
- Repair or replace the safety system control unit (SDM).
Troubleshooting by symptoms
| Symptom | Possible Solution |
|---|---|
| Airbag light is on | Check and repair the airbag circuit |
| B0068 code persists after reset | Replace the airbag module or SDM unit |
B0068 Frequently Asked Questions
What should I do if I encounter error code B0068?
Error code B0068 indicates a problem with the driver circuit of the left side curtain airbag. The wiring, connectors, airbag module, and safety control unit need to be diagnosed.
Can I drive with error code B0068?
It is not recommended, as the airbag may not deploy in an accident, posing a serious threat to the safety of the driver and passengers.
Can error B0068 occur after an accident?
Yes, if the car is involved in an accident, the airbag module may be damaged, which can lead to this error.
Can I reset the B0068 code myself?
It can be reset using a diagnostic scanner, but if the cause is not eliminated, the error will reappear. It is important to have repairs performed under expert supervision.
Does error B0068 require replacing the airbag module?
Not necessarily. Sometimes, simply repairing the wiring or replacing a damaged connector is sufficient. However, if the module itself is damaged, it must be replaced.
Do I need to contact service when B0068 appears?
Yes, because the vehicle’s safety system requires professional diagnosis and intervention to ensure reliable protection.
B0068 related OBD2 errors:
B0065 – Left front seat belt pretensioner open circuit
B0066 – Left front seat belt pretensioner activation circuit short circuit
B0069 – Right ceiling curtain airbag module drive circuit
Important! With this error present, the airbag may not deploy in an accident, increasing the risk of injury. Diagnosis and repair should be performed promptly.