Honda PGM-FI Code 12: No. 1 Fuel Injector — Causes & Fix
On Honda motorcycles and scooters, PGM-FI code 12 means the ECM has detected a fault in the No. 1 fuel injector circuit — the injector that sprays fuel into the intake for that cylinder.
- Applies to
- Honda motorcycles
- Est. repair cost
- $25 – $200
- Time to fix
- 30–90 minutes
What it means
Typical causes are a loose/corroded injector connector, damaged wiring, or a clogged or electrically failed injector. This is a generic Honda PGM-FI (Programmed Fuel Injection) code, so it applies across Honda FI models — scooters and underbones like the Click, Vario, BeAT, PCX, ADV, and Wave, as well as CB/CBR motorcycles. Honda shows it by blinking the FI/MIL warning light: a long blink counts as ten and a short blink counts as one (e.g. one long + two short = code 12). Clearing the code usually needs Honda’s service-check reset procedure (jumping the DLC service connector, or a scan tool) after the fault is fixed; simply resetting without repair will let the light return.
Symptoms
- FI/MIL light on with code 12
- Misfire, rough idle, or the engine won’t start
- Strong fuel smell or fouled plug
- Loss of power
How to fix it
- 1
Inspect the injector connector and wiring
1. Unplug the injector connector and check for corrosion or looseness. 2. Inspect the harness for breaks; reseat firmly.
- 2
Test the injector
1. Measure the injector coil resistance against spec — an open or shorted coil means a failed injector. 2. Listen for a clicking injector with the engine cranking.
- 3
Clean or replace, then reset
1. Clean a clogged injector or replace a faulty one. 2. Clear the code and confirm the misfire is gone.
Frequently asked questions
Should I keep riding with code 12?
No — a misfiring or dead injector can wash oil off the cylinder and dump raw fuel into the exhaust. Fix it before riding much.
Will an injector cleaner fix code 12?
Only if the problem is a partial clog. An electrical fault (open/short in the injector or wiring) needs the connector, wiring, or injector repaired.
Last updated July 15, 2026
Guidance only — always consult a qualified professional or the official service manual before carrying out repairs.