Suzuki FI Code C23: Tip-Over Sensor — Causes & Fix
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.
- Applies to
- Suzuki motorcycles
- Est. repair cost
- $20 – $140
- Time to fix
- 30–90 minutes
What it means
Usual causes are the sensor left tripped, a loose/corroded connector, harness damage, or a failed tip-over sensor. This is a generic Suzuki fuel-injection (FI) code, so it applies across Suzuki FI models — the Raider R150 Fi, Smash, Gixxer, GSX-R and GSX-S range, V-Strom, and more. Suzuki reports it as a "C" number, shown through the FI-light blink pattern or by entering the bike’s dealer/diagnostic mode. After the fault is repaired it becomes a stored "history" code; clear it through Suzuki’s dealer/diagnostic mode so the FI light goes out.
Symptoms
- FI light on with code C23; engine won’t start or cuts out
- Often appears after a fall or lean-over
- Fuel pump/ignition cut
How to fix it
- 1
Reset by standing the bike upright
1. Stand the bike fully vertical. 2. Turn the ignition off then on — after a genuine tip-over this usually restores starting.
- 2
Inspect or replace the sensor
1. Check the TOS connector and wiring. 2. Replace the sensor if it stays tripped or is out of spec, then clear the code.
Frequently asked questions
My Suzuki won’t start after dropping it — is C23 why?
Very likely. The tip-over sensor cuts the engine for safety. Stand the bike up and cycle the ignition; if it still won’t start, check the sensor and connector.
Last updated July 15, 2026
Guidance only — always consult a qualified professional or the official service manual before carrying out repairs.