B0066 Code - Left Front/Driver Pretensioner Deployment Loop Voltage Out of Range
Quick Answer
The driver seat belt pretensioner deployment loop consists of a seat belt pretensioner - LF and the seat belt pretensioner - LF high and low circuits. Common causes include Faulty Left Front/Driver Pretensioner, Left Front/Driver Pretensioner harness is open or shorted, Left Front/Driver Pretensioner 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
- B0066 indicates Left Front/Driver Pretensioner Deployment Loop Voltage Out of Range.
- Common causes
- Common causes include Faulty Left Front/Driver Pretensioner, Left Front/Driver Pretensioner harness is open or shorted, Left Front/Driver Pretensioner 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.
Code B0066 Description
What are the Possible Causes of the DTC B0066?
- Faulty Left Front/Driver Pretensioner
- Left Front/Driver Pretensioner harness is open or shorted
- Left Front/Driver Pretensioner circuit poor electrical connection
- Faulty Sensing and Diagnostic Module (SDM)
How to Fix the DTC B0066?
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 B0066 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
- B0066 Buick — Left Front/Driver Pretensioner Deployment Loop Voltage Out of Range
- B0066 Cadillac — Left Front/Driver Pretensioner Deployment Loop Voltage Out of Range
- B0066 Chevrolet — Left Front/Driver Pretensioner Deployment Loop Voltage Out of Range
- B0066 GMC — Left Front/Driver Pretensioner Deployment Loop Voltage Out of Range
Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service
- Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
- Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
- Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
- Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.
Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.
Frequently Asked Questions about B0066 Code
1. What does the OBDII code B0066 mean?
The code B0066 indicates that the voltage in the left front/driver pretensioner deployment loop is out of the expected range, signaling a potential issue with the driver seatbelt pretensioner system.
2. What are the common symptoms of code B0066?
Symptoms may include the airbag warning light illuminating, the seatbelt pretensioner not functioning properly, or a stored trouble code when scanned.
3. What causes the B0066 code to appear?
Common causes include damaged or corroded wiring, a faulty seatbelt pretensioner, a poor electrical connection, or a malfunctioning airbag control module.
4. Can I still drive my car with a B0066 code?
While the vehicle may still be drivable, the safety systems like the seatbelt pretensioner or airbags may not work as intended in an accident, posing a serious safety risk.
5. How do I diagnose the B0066 code?
Start by using an OBDII scanner to confirm the code. Then inspect the wiring, connectors, and pretensioner for damage or corrosion. Advanced diagnosis may require checking the resistance and voltage in the circuit.
6. How can I fix the B0066 code?
Repairs typically involve repairing damaged wiring, cleaning or securing electrical connections, or replacing a faulty seatbelt pretensioner. In some cases, the airbag control module may need replacement.
7. How much does it cost to repair a B0066 code?
Repair costs vary depending on the issue, but replacing a seatbelt pretensioner can cost $200–$500, while airbag module repairs may cost $500–$1,000 or more.
8. Can a blown fuse cause the B0066 code?
A blown fuse is not a typical cause of this code, but it’s worth checking the airbag and pretensioner-related fuses as part of the diagnostic process.
9. Does clearing the code fix the issue?
Clearing the code will turn off the warning light temporarily, but if the underlying issue isn’t resolved, the code and light will return.
10. Is the B0066 code specific to certain car brands or models?
No, the B0066 code is a generic OBDII code, but its exact diagnostic and repair steps may vary slightly depending on the vehicle make and model. Always consult your vehicle’s service manual for specific guidance.
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