C3986 Subaru Auto Trouble Code

C3986 Subaru OBD2 may also be triggered by faults earlier down the line. For example, a dirty MAF sensor might be causing the car to overcompensate in its fuel-trim adjustments. As a result, oxygen sensors are likely to report fuel mixture problems.

The crank but won't start condition, along with the trouble codes may make you think you've got a PATS anti-theft system problem. However, Ford reports that these codes are all related to software bugs. The only way around the problem is to reprogram the PCM with the latest software.

C3986 Subaru Possible Solution:

Power Steering Pressure (PSP) Switch Malfunction In Key On, Engine Off Self-Test, this DTC indicates the PSP input to the PCM is high. In Key On, Engine Running Self-Test, this DTC indicates that the PSP input did not change state. Steering wheel must be turned during Key On, Engine Running Self-Test PSP switch/shorting bar damaged SIG RTN circuit open PSP circuit open or shorted to SIGRTN PCM damaged.

C3986 Subaru Description For All Models :

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

C3986 Subaru Trouble Repair :

C3986 Subaru code shows that location the body harness connector, located in and around the left hand kick panel area or inside the IP (consult a shop manual for location). Water can leak into the connector from clogged sunroof drains, A-pillar leaks, or windshield or cowling leaks.

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