B140C Code - Second Row Driver Side Seatbelt Sensor Circuit
Quick Answer
The Restraint Control Module (RCM) continuously monitors the second row left safety belt buckle switch circuits for the following faults: Open circuit, Short to voltage, Short to ground, Current out of range, Faulted second row left safety belt buckle switch. Common causes include Faulty Second Row Driver Side Seatbelt, Second Row Driver Side Seatbelt harness is open or shorted, Second Row Driver Side Seatbelt 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
- B140C indicates Second Row Driver Side Seatbelt Sensor Circuit.
- Common causes
- Common causes include Faulty Second Row Driver Side Seatbelt, Second Row Driver Side Seatbelt harness is open or shorted, Second Row Driver Side Seatbelt 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 B140C Description
What are the Possible Causes of the DTC B140C?
- Faulty Second Row Driver Side Seatbelt
- Second Row Driver Side Seatbelt harness is open or shorted
- Second Row Driver Side Seatbelt circuit poor electrical connection
- Faulty Restraint Control Module (RCM)
How to Fix the DTC B140C?
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.
Code Tech Notes
B140C:12 Second Row Driver Side Seatbelt Sensor Circuit Short to Battery
B140C:13 Second Row Driver Side Seatbelt Sensor Circuit Open
B140C:1D Second Row Driver Side Seatbelt Sensor Circuit Current Out of Range
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B140C 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
- B140C Ford — Second Row Driver Side Seatbelt Sensor Circuit
- B140C Lincoln — Second Row Driver Side Seatbelt Sensor Circuit
- B140C Mercury — Second Row Driver Side Seatbelt Sensor Circuit
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 B140C Code
1. What does the OBDII code B140C mean?
B140C indicates an issue with the second-row driver-side seatbelt sensor circuit, which monitors the status of the seatbelt for safety systems.
2. What are the symptoms of code B140C?
Common symptoms include the seatbelt warning light staying on, malfunctioning airbag systems, or a chime indicating a seatbelt issue.
3. What causes code B140C to appear?
The code can be triggered by a damaged seatbelt sensor, a faulty wiring connection, corroded terminals, or a malfunctioning control module.
4. Can I still drive my car with a B140C code?
While the vehicle may still be drivable, safety features like airbags could be compromised, so it’s important to address the issue promptly.
5. How do I diagnose a B140C code?
Start by inspecting the seatbelt sensor, wiring, and connectors for visible damage. Use a multimeter to test the circuit for continuity and check for stored codes with a scan tool.
6. How can I fix the B140C code?
Repairs may involve replacing the faulty seatbelt sensor, repairing or replacing damaged wiring, or cleaning corroded connectors.
7. How much does it cost to repair a B140C code?
Repair costs can vary, but replacing a seatbelt sensor typically ranges from $150 to $300, depending on labor and parts.
8. Can a loose seatbelt cause a B140C code?
No, a loose seatbelt typically won’t cause this code. The issue lies in the sensor circuit, not the physical seatbelt itself.
9. Will resetting the code fix the problem?
Resetting the code will clear it temporarily, but the issue will reappear unless the underlying problem is resolved.
10. Is the B140C code related to airbag deployment?
Yes, since the seatbelt sensor is part of the safety system, a malfunction could affect airbag deployment in certain situations.
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