The OBD code B278A indicates a fault with the engine switch circuit in the Certification ECU (Smart Key ECU Assembly).
Symptoms include the Engine Light being ON.
This issue is commonly caused by a faulty engine switch or related wiring harness issues.
It is important to visually inspect the wiring harness and connectors for any damage or corrosion to resolve this problem.
| 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 b278a OBD Code
The vehicle displays a warning light indicating a fault with the b278a code stored in the system.
- Symptoms: Service Engine Soon Warning Light ON.
- Possible loss of communication with the body control module.
- Difficulty starting the vehicle.
- Engine stalling while driving.
- Difficulty shifting gears.
Causes of the b278a OBD Code
Possible issues related to fault code B278A include faulty steering angle sensor or wiring problems.
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- B278A can be caused by a faulty Engine Switch.
- An open or shorted Engine Switch harness.
- Poor electrical connection in the Engine Switch circuit.
- A faulty Certification ECU (Smart Key ECU Assembly).
Fixing Error Code b278a Step By Step
To address fault code B278A, inspect and repair the steering angle sensor circuit as needed.
- To fix OBDII code B278A, first, review the possible causes related to this code.
- Visually examine the wiring harness and connectors associated with the affected component.
- Check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- Perform a thorough check of the affected system to ensure all connections are secure and free of any issues.
- If any damaged wiring or connectors are found, repair or replace them as necessary.
- Finally, clear the fault code and test drive the vehicle to verify that the issue has been resolved.
Cost Of Fixing b278a Fault Code
Diagnosing and repairing fault code B278A may involve inspecting and potentially replacing the steering angle sensor.
The cost to diagnose and fix OBD code B278A 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. Actual cost may vary based on shop rates and the complexity of the repair.
Details of the b278a OBD Code
B278A code indicates a problem with the driver’s seatbelt pretensioner circuit.
OBD code B278A means Left Rear Position Sensor Circuit Range/Performance on a specific vehicle make and model.
This code is triggered by the Body Control Module (BCM) when it detects a fault in the left rear position sensor circuit.
The left rear position sensor is typically part of a system like a parking assist system or a suspension system that monitors the position of the vehicle’s components.
When the sensor circuit’s performance is out of the expected range, the BCM sets this code to indicate an issue with the left rear position sensor.
Mechanic’s Tech Notes
Code B278A indicates a malfunction in the steering angle sensor circuit.
OBDII code B278A typically indicates a problem with the transmission control module (TCM) power supply circuit.
To diagnose, use a voltmeter to check TCM power and ground connections for proper voltage levels.
Utilize a scan tool to confirm TCM communication over the Controller Area Network (CAN) bus.
Visually inspect wiring harnesses and connectors for any damage, and ensure connector pins are not broken, bent, pushed out, or corroded.
If necessary, consider reprogramming or reflashing the TCM.
FAQ
OBD code B278A indicates a fault with the engine switch circuit. Check for a faulty engine switch, open/shorted harness, or issues with the Certification ECU.
Common symptoms of OBD code B278A include Engine Light ON, caused by issues like faulty Engine Switch or Certification ECU. Fix involves inspecting wiring and connectors for damage.
Diagnose OBD code B278A by checking for a faulty engine switch, open/shorted harness, or faulty Certification ECU. Inspect wiring and connectors for damage.
Wrap Up
If your vehicle displays OBDII code b278a, you may experience issues with the steering angle sensor, such as incorrect steering angle readings or stability control malfunctions.
This code commonly indicates a fault with the steering angle sensor itself, wiring problems, or a faulty connection.
To address OBDII code b278a, start by inspecting the wiring harness and connectors related to the steering angle sensor.
Check for any damaged wires, loose connections, or corrosion.
If no issues are found, consider replacing the steering angle sensor to resolve the problem effectively.
