B278A Subaru Vivio OBD Code

OBD/2 B278A error code description and symptoms.

Engine Coolant Temperature (ECT) Circuit High Input Indicates the sensor signal is greater than Self-Test maximum. The ECT sensor maximum is 4.6 volts or -50 C (-58 F). Note on some vehicles that are not equipped with an ECT sensor, CHT can be used and can set this DTC. Open circuit in harness Sensor signal short to power Damaged PCM Improper harness connection Damaged sensor ECT V PID reading greater than 4.6 volts with key ON and engine OFF or during any engine operating mode indicates a hard fault.

To check for an open circuit, trace along the length of the transmission control circuit, checking for breaks in the wiring. Repair any broken wiring and make sure all connectors are fully seated and locked.Pay close attention to connectors, looking for corrosion, bent or broken pins, or moisture in the connector. Repair any connector issues even if they are not specifically part of the transmission control circuit as they may serve a function in providing power to the transmission control circuit.

B278A Subaru Vivio Error Code Repair Process :

When you turn on the ignition, the Service Engine Soon or Check Engine B278A light should flash briefly, indicating that the OBD system is ready to scan your vehicle for any malfunctions. After this brief flash, the light should stay off while you drive as long as no problems are detected. If engine overboost condition so, you'll be glad to know that your vehicle is equipped with an early warning system that could save you time, money, and fuel in addition to helping protect the engine overboost condition.

Difficulty Level (Soso)

Repair Time (50 Min.)

Cost Prediction : $ 30-110

Common Causes of Subaru Vivio B278A OBD2 Code

A common cause of code B278A is the failure of Engine Overboost Condition, but there are several other possible causes as well, such as ;

• Engine Control Module (ECM)
• Faulty ignition coil (s)
• Faulty Variable Camshaft Timing (VCT) position solenoid
• Damaged camshaft position (CMP) sensor

B278A is a kind of Body Trouble Code Auto body problems aren't always easy to spot. Diagnosing auto body problems sometimes requires a little know-how. In this section you'll find articles dedicated to teaching you how to diagnose auto body problems.

B278A code for other Subaru cars

You can view according B278A DTC for your car model. We selected several models to see obd2 solutions click and view it.

• B278A Subaru 1.8
• B278A Subaru 1400
• B278A Subaru 1600
• B278A Subaru 360
• B278A Subaru Alfa
• B278A Subaru B11
• B278A Subaru B9
• B278A Subaru Baja
• B278A Subaru Coupe
• B278A Subaru Dl
• B278A Subaru Ff-1
• B278A Subaru Forester
• B278A Subaru Forester 1
• B278A Subaru Forester 2
• B278A Subaru Forester 3
• B278A Subaru G3x
• B278A Subaru G3x Justy
• B278A Subaru H6
• B278A Subaru Hm
• B278A Subaru Impreza
• B278A Subaru Impreza 2
• B278A Subaru Impreza 3
• B278A Subaru Justy
• B278A Subaru K111
• B278A Subaru Legacy
• B278A Subaru Legacy 3
• B278A Subaru Legacy 4
• B278A Subaru Leone
• B278A Subaru Liberty
• B278A Subaru M80
• B278A Subaru Mini Jumbo
• B278A Subaru Outback
• B278A Subaru Outback 2
• B278A Subaru Outback 3
• B278A Subaru Pleo
• B278A Subaru R1
• B278A Subaru R2
• B278A Subaru Rex
• B278A Subaru Sagres
• B278A Subaru Stella
• B278A Subaru Stx
• B278A Subaru Svx
• B278A Subaru Traviq
• B278A Subaru Tribeca
• B278A Subaru Wx
• B278A Subaru Xt
• B278A Subaru Xv

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