B3979 Subaru Legacy 4 OBD Code

OBD/2 B3979 error code description and symptoms.

The Transmission Range Sensor (also referred to as the PRNDL input an/or neutral safety switch) tells the transmission control module (TCM) an the engine control module (PCM) that the transmission is in park, reverse, neutral, drive, low, 2nd, 3rd etc. It is attached directly to the manual valve of transmission, so when the shift lever is moved from park to drive, the Transmission Range Sensor communicates this critical information to the above mentioned vehicle control module systems.

Gear changes are accomplished by a command from the TCM to energize the clutch actuator to release the clutch; after which various actuators inside the transmission disengage the current gear, and depending on current operating conditions, engage the next higher or lower gear ratio. All of this happens much faster than a human driver could change gears, and in most applications, gear changes are as smooth and seamless as on any fully automatic transmission.

B3979 Subaru Legacy 4 Error Code Repair Process :

When you turn on the ignition, the Service Engine Soon or Check Engine B3979 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 door handle switch circuit open 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 door handle switch circuit open.

Difficulty Level (Expert)

Repair Time (35 Min.)

Cost Prediction : $ 30-110

Common Causes of Subaru Legacy 4 B3979 OBD2 Code

A common cause of code B3979 is the failure of Door Handle Switch Circuit Open, but there are several other possible causes as well, such as ;

• Air fuel ratio (A/F) Sensor 1 Bank 1 harness is open or shorted
• Clogged or faulty fuel injector (s)
• Faulty TCM or TCM programming
• Intake Valve Timing Control Solenoid Valve harness is open or shorted

B3979 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.

B3979 code for other Subaru cars

You can view according B3979 DTC for your car model. We selected several models to see obd2 solutions click and view it.

• B3979 Subaru 1.8
• B3979 Subaru 1400
• B3979 Subaru 1600
• B3979 Subaru 360
• B3979 Subaru Alfa
• B3979 Subaru B11
• B3979 Subaru B9
• B3979 Subaru Baja
• B3979 Subaru Coupe
• B3979 Subaru Dl
• B3979 Subaru Ff-1
• B3979 Subaru Forester
• B3979 Subaru Forester 1
• B3979 Subaru Forester 2
• B3979 Subaru Forester 3
• B3979 Subaru G3x
• B3979 Subaru G3x Justy
• B3979 Subaru H6
• B3979 Subaru Hm
• B3979 Subaru Impreza
• B3979 Subaru Impreza 2
• B3979 Subaru Impreza 3
• B3979 Subaru Justy
• B3979 Subaru K111
• B3979 Subaru Legacy
• B3979 Subaru Legacy 3
• B3979 Subaru Leone
• B3979 Subaru Liberty
• B3979 Subaru M80
• B3979 Subaru Mini Jumbo
• B3979 Subaru Outback
• B3979 Subaru Outback 2
• B3979 Subaru Outback 3
• B3979 Subaru Pleo
• B3979 Subaru R1
• B3979 Subaru R2
• B3979 Subaru Rex
• B3979 Subaru Sagres
• B3979 Subaru Stella
• B3979 Subaru Stx
• B3979 Subaru Svx
• B3979 Subaru Traviq
• B3979 Subaru Tribeca
• B3979 Subaru Vivio
• B3979 Subaru Wx
• B3979 Subaru Xt
• B3979 Subaru Xv

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