P1320 — Ignition Signal Circuit Malfunction
CAUTIONIs it safe to drive? Drive gently and get it looked at soon — it can worsen or fail inspection.
What P1320 means
This is a manufacturer-specific code — its meaning depends on the vehicle’s make (see below).
What P1320 means on specific makes
Nissan / Infiniti CAUTION
Fault in the ignition (primary) signal circuit — the ECM isn't seeing proper feedback from the ignition coils/power transistor. A very common Nissan misfire/no-start contributor (especially older coil-on-plug Maxima/Altima/Frontier).
- Failed ignition coil(s) ($30-100 each)
- Coil power transistor / ignition module
- Worn spark plugs
- Coil connector/wiring fault
Check first: Check coils and plugs; swap a coil to see if a misfire follows. Bad coils are the dominant cause of P1320 on Nissans.
Source: troublecodes.net/nissancodes, ricksfreeautorepairadvice.com/nissan-obd2-codes