The OBD code B2128 indicates a communication issue in the Universal Asynchronous Receiver Transmitter (UART) line related to the driver seat control unit.
Symptoms include the Engine Light being ON.
Causes may include a faulty driver seat control unit or issues with the unit’s harness or electrical connections.
This issue is moderate in seriousness.
To fix it, inspect the wiring harness, connectors, and components for any damage or poor connections.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 10.0 (Out of 10) |
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Symptoms of the b2128 OBD Code
The vehicle displays a warning light indicating a fault with the Occupant Classification System.
- Symptoms: Service Engine Soon Warning Light comes on.
- Loss of communication with the vehicle immobilizer control module.
- Engine may not start.
Causes of the b2128 OBD Code
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Possible triggers for fault code B2128 include issues with the airbag system or seatbelt pretensioner.
- B2128 can be caused by a faulty Universal Asynchronous Receiver Transmitter (UART) Communication Line.
- A faulty Driver seat control unit.
- An open or shorted Driver seat control unit harness.
- A poor electrical connection in the Driver seat control unit circuit.
Fixing Error Code b2128 Step By Step
Address the faulty passenger airbag indicator circuit by checking wiring and connections for code B2128.
- To fix OBDII code B2128, first, review the ‘Possible Causes’ mentioned above and visually examine the corresponding wiring harness and connectors.
- Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- Next, check the circuit for proper voltage and continuity.
- Test the component associated with the code, such as a door lock switch or actuator, for proper operation.
- Replace the faulty component if necessary.
- Clear the fault codes from the vehicle’s computer using a scan tool.
- Finally, perform a road test to ensure the issue has been resolved.
Cost Of Fixing b2128 Fault Code
The repair for fault code B2128 typically involves replacing the driver’s door key cylinder switch.
The cost to diagnose and fix OBD code B2128 depends on the estimated 1. 0hour repair time.
Labor rates usually range from $75 to $150 per hour, so the general cost could be between $75 and $150. The final cost may vary based on shop rates, complexity of the issue, and any additional parts needed for the repair.
Details of the b2128 OBD Code
B2128 code indicates a fault in the driver’s door key cylinder switch circuit.
OBD code B2128 means Left Rear Power Window Motor Up Circuit Failure.
This code is triggered by the Body Control Module (BCM) when it detects a malfunction in the circuit related to the left rear power window motor going up.
The BCM monitors the signals and operation of the power window system in the vehicle.
Mechanic’s Tech Notes
Code B2128 indicates a fault in the driver’s door key cylinder switch circuit.
OBDII code B2128 indicates a problem with the transmission range sensor circuit.
To diagnose, use a multimeter to check power and ground to the Transmission Control Module (TCM).
Verify TCM communication over the Controller Area Network (CAN) using a scan tool.
Visually inspect wiring harnesses and connectors for damage, and check for broken, bent, or corroded pins.
Reflash the TCM if necessary.
FAQ
OBD code B2128 indicates an issue with the driver seat control unit circuit. Check wiring harness, connectors, and components for damage or poor connection.
Common symptoms of OBD code B2128 include Engine Light ON, caused by issues with UART communication line, faulty driver seat control unit, or related wiring harness/connectors. Fix: Inspect and repair as needed.
Diagnose OBD code B2128 by checking UART communication line, driver seat control unit, and related wiring for faults. Inspect connectors and harness for damage or poor connections.
Wrap Up
If your vehicle displays OBD code b2128, you may experience issues with the driver’s door key cylinder switch.
This could be caused by a faulty key cylinder switch, damaged wiring, or a poor connection in the circuit.
To address OBD code b2128, check the wiring harness and connectors related to the driver’s door key cylinder switch.
Ensure there are no loose connections, damaged wires, or corrosion present.
Consider replacing the key cylinder switch if necessary to resolve the issue.
