Code P1603?

Tiny
LEO2012P
  • MEMBER
  • 2018 SUBARU IMPREZA
  • 2.0L
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 190,000 MILES
Car almost stalled dropped low rpm while in park.
All lights came on and code is p1603, car runs fine, with a rpm drop and hesitation one time at 70 MPH. Going to start multimeter testing sensors now but don’t know where to start.
Sunday, May 21st, 2023 AT 12:10 PM

1 Reply

Tiny
BORIS K
  • MECHANIC
  • 795 POSTS
Hello,

For your model Subaru Impreza there is a possible software update for the engine control module

I would suggest contacting your nearest Subaru dealer to confirm this.

A link for the field action:
https://subaru.oemdtc.com/1570/ecm-reprogramming-for-dtc-p1603-engine-idle-drop-or-stall-2017-2019-subaru-impreza-2018-2019-crosstrek

Cheers, Boris
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Monday, May 22nd, 2023 AT 1:17 AM

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