Suzuki motorcycle fault codes and warning indicators, with meanings, causes, and step-by-step fixes.
68 models · 21 error codes
On Suzuki motorcycles and scooters, FI code C12 means a fault in the crankshaft position sensor circuit — the sensor that gives the ECM engine speed and position for spark and injection timing.
On Suzuki motorcycles and scooters, FI code C13 means a fault in the intake air pressure (IAP) sensor circuit — the sensor that reads manifold pressure so the ECM can meter fuel.
On Suzuki motorcycles and scooters, FI code C14 means a fault in the throttle position sensor (TPS) circuit — the sensor that tells the ECM how far the throttle is open.
On Suzuki motorcycles and scooters, FI code C15 means a fault in the engine coolant temperature (ECT) sensor circuit — used by the ECM for cold-start enrichment and fan control.
On Suzuki motorcycles and scooters, FI code C21 means a fault in the intake air temperature (IAT) sensor circuit — used to fine-tune fuelling for air density.
On Suzuki motorcycles and scooters, FI code C22 means a fault in the atmospheric (ambient) pressure sensor circuit — used to compensate fuelling for altitude and barometric pressure.
On Suzuki motorcycles and scooters, FI code C23 means a fault in the tip-over sensor (TOS) circuit — the safety sensor that cuts the engine if the bike falls over.
On Suzuki motorcycles and scooters, FI code C24 means a fault in the ignition (coil) signal circuit — the ECM isn’t seeing a correct ignition primary signal.
On Suzuki motorcycles and scooters, FI code C32 means a fault in the fuel injector signal circuit — the ECM isn’t driving the injector correctly.
On Suzuki motorcycles and scooters, FI code C41 means a fault in the fuel pump control system — the ECM/relay isn’t driving the fuel pump correctly.
On Suzuki motorcycles and scooters, FI code C44 means a fault in the heated oxygen (O2) sensor circuit — the sensor the ECM uses to trim the mixture for clean, efficient running.
On Suzuki motorcycles and scooters, FI code C11 means a fault in the camshaft position sensor circuit — the sensor the ECM uses to identify the cylinder cycle for injection and ignition timing.
On Suzuki motorcycles and scooters, FI code C28 means a fault in the secondary throttle valve actuator (STVA) — the motor that moves the ECM-controlled secondary throttle plates.
On Suzuki motorcycles and scooters, FI code C29 means a fault in the secondary throttle position (STP) sensor circuit — the sensor that reports the position of the secondary throttle valves.
On Suzuki motorcycles and scooters, FI code C31 means a fault in the gear position sensor circuit — the switch that tells the ECM which gear is selected (used for the gear indicator and fuel/ignition maps).
On Suzuki motorcycles and scooters, FI code C40 means a fault in the idle speed control (ISC) valve circuit — the valve that meters air to hold a steady idle.
On Suzuki motorcycles and scooters, FI code C42 means a fault in the ignition switch signal to the ECM — often linked to the ignition/immobilizer circuit.
On Suzuki motorcycles and scooters, FI code C49 means a fault in the PAIR (pulsed secondary air injection) control solenoid circuit — an emissions device that adds air to the exhaust to burn off unburnt fuel.
On Suzuki motorcycles and scooters, FI code C60 means a fault in the cooling fan control (fan relay) circuit — the relay that switches the radiator fan on and off.
On Suzuki motorcycles and scooters, FI code C46 means a fault in the exhaust control valve actuator circuit — the servo that moves Suzuki’s exhaust tuning valve to broaden the power band.
On Suzuki motorcycles and scooters, FI code C62 means a fault in the EVAP (evaporative emissions) purge control valve circuit — an emissions device that routes fuel-tank vapours to be burned.
These codes apply across Suzuki models, including:
