B278A Subaru Impreza 2 OBD Code

OBD/2 B278A error code description and symptoms.

The input turbine speed sensor detects rotation of the input shaft of the input shaft speed sensor transmission. The computer uses that information, along with the output shaft speed sensor to determine if the transmission is operating according to plan. If the computer detects a difference between the input shaft speed , and the expected output shaft speed, it will adjust transmission pump pressure to prevent clutch disc slip. If adding pressure doesn't solve the problem, it will set a trouble code.

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 Impreza 2 Error Code Repair Process :

If your engine overboost condition check engine light is illuminated, it's best to take it in for diagnostic testing, which can feel like a hassle. Because while the lights vary in appearance from vehicle to vehicle, all have the same basic meaning: There's a problem with the car's emissions system. The on-board diagnostics system B278A and engine control unit are in charge of monitoring a bunch of different engine overboost condition, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Subaru Impreza 2 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 ;

Faulty Air Flow Meter
Air fuel ratio (A/F) Sensor 1 Bank 1 harness is open or shorted
Foreign matter caught in fuel filler cap
Faulty select solenoid

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.

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

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B278A Subaru Impreza 2 OBD Code

B278A Subaru Impreza 2 Error Code Repair Process :

Common Causes of Subaru Impreza 2 B278A OBD2 Code

B278A code for other Subaru cars