P1500 — Alternator FR Terminal Circuit

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

What P1500 means

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

What P1500 means on specific makes

Mitsubishi CAUTION

Fault in the alternator FR (field/load monitor) terminal circuit the ECM uses to manage charging and idle under electrical load. Can cause charging/idle quality issues.

  1. Failed alternator (FR terminal) ($150-400)
  2. FR circuit wiring/connector fault
  3. ECM input issue

Check first: Check the alternator FR signal and charging output; inspect the FR wire to the ECM.

Source: troublecodes.net/mitsu, ricksfreeautorepairadvice.com/mitsubishi-obd2-codes

Related codes

P0620P0622
Decode any code in the live tool →