OBD code B2720 indicates a fault with the Rear Sonar Sensor Left Outer in the vehicle’s parking assist system.
Symptoms include the Engine Light being ON.
The issue is commonly caused by a faulty sensor, wiring harness issues, or a defective Sonar Control Unit.
While not a critical problem, it can affect parking assistance.
To fix, inspect and repair the sensor, wiring, and connections as needed.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 10.0 (Out of 10) |
Symptoms of the b2720 OBD Code
The vehicle displays a warning light indicating a communication error with the keyless entry system.
- Symptoms: Service Engine Soon Warning Light ON.
- Vehicle may not start.
- Steering wheel may be locked.
- Horn may not work.
- Power windows may not operate.
Causes of the b2720 OBD Code
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Possible triggers for fault code B2720 include issues with the keyless entry system or the vehicle’s immobilizer.
- B2720 can be caused by a Faulty Rear Sonar Sensor Left Outer.
- A Rear Sonar Sensor Left Outer harness that is open or shorted.
- A Rear Sonar Sensor Left Outer circuit with a poor electrical connection.
- Or a Faulty Sonar Control Unit.
Fixing Error Code b2720 Step By Step
To address fault code B2720, inspect and repair the driver’s seat belt buckle switch circuit.
- To fix OBDII code B2720, first, review the possible causes related to this code.
- Visually inspect the wiring harness and connectors associated with the code.
- Check for any damaged components and ensure the connector pins are not broken, bent, pushed out, or corroded.
- If no issues are found during the visual inspection, proceed to test the sensor or module related to the code for proper operation.
- Replace the sensor or module if necessary.
- Clear the fault codes from the vehicle’s computer using a scan tool.
- Test drive the vehicle to verify the repair and ensure the code does not return.
Cost Of Fixing b2720 Fault Code
The repair for fault code B2720 typically involves replacing the driver’s seat belt buckle switch.
The cost to diagnose and fix OBD code B2720 depends on the estimated 1. 0hour repair time.
Labor rates usually range from $75 to $150 per hour, so the total cost could be between $75 and $150. Factors like shop rates and the complexity of the repair can influence the final cost.
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Details of the b2720 OBD Code
B2720 code indicates a malfunction in the driver’s seatbelt pretensioner circuit.
OBD code B2720 means Passenger Seat Recline Forward Switch Circuit Short to Battery.
This code is triggered by the Body Control Module (BCM) when it detects a short to battery in the circuit related to the passenger seat recline forward switch.
The BCM monitors the signals from various switches in the vehicle, including the seat controls, to ensure proper operation and safety.
Mechanic’s Tech Notes
Code B2720 indicates a malfunction in the driver’s seat belt buckle switch circuit.
OBDII code B2720 indicates a communication issue with the transmission control module (TCM).
To diagnose, check TCM power and ground using a multimeter.
Verify TCM response over the Controller Area Network (CAN) using a scan tool.
Inspect wiring harness and connectors for damage, corrosion, or bent pins.
Reflash the TCM if needed.
This code commonly points to faulty wiring, connector issues, or TCM malfunctions.
By performing these tests and inspections, you can pinpoint the root cause and proceed with the necessary repairs.
FAQ
OBD code B2720 indicates an issue with the Rear Sonar Sensor Left Outer. Check sensor, wiring, and connections for faults to resolve.
Common symptoms of OBD code B2720 include Engine Light ON. Causes may be a faulty Rear Sonar Sensor Left Outer or related wiring issues. Fix: Inspect and repair sensor and wiring.
Diagnose OBD code B2720 by checking Rear Sonar Sensor Left Outer and its wiring for faults. Inspect connectors for damage or corrosion. Repair as needed.
Wrap Up
If your vehicle is displaying OBD code b2720 along with issues like erratic speedometer readings or ABS system malfunctions, it may indicate a fault in the vehicle speed sensor circuit.
Possible causes include a faulty vehicle speed sensor, damaged wiring harness, or poor electrical connections.
To address OBD code b2720, start by inspecting the vehicle speed sensor and its wiring for any visible damage.
Test the sensor’s output signal using a multimeter and ensure proper connection at the sensor and ABS control module.
Replace the sensor if necessary and repair any damaged wiring or connectors to resolve the issue.
