P1518 — Starter Switch Circuit Low Input

CAUTIONIs it safe to drive? Drive gently and get it looked at soon — it can worsen or fail inspection.

What P1518 means

This is a manufacturer-specific code — its meaning depends on the vehicle’s make (see below).

What P1518 means on specific makes

Subaru CAUTION

The ECM isn't getting the expected starter-switch (start signal) input. Affects start logic and immobilizer/PNP interplay; commonly seen with no-start complaints on Subarus.

  1. Ignition/starter switch fault
  2. Wiring/connector to ECM start circuit
  3. Neutral/clutch safety switch issue

Check first: Check the start-signal wire to the ECM during cranking; inspect ignition switch and safety switches. Often appears alongside transmission/PNP codes (P0851 etc.).

Source: obd-codes.com/trouble_codes/subaru, justanswer.com Subaru P1518

Related codes

P0851P0617
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