Suzuki FI Code C24: Ignition Signal — Causes & Fix
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.
- Applies to
- Suzuki motorcycles
- Est. repair cost
- $25 – $200
- Time to fix
- 30–90 minutes
What it means
Check the ignition coil connector and primary wiring, the coil itself, and the ECM ignition driver circuit. 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 C24
- Misfire, weak spark, or no start
- Loss of power
How to fix it
- 1
Inspect the coil connector and wiring
1. Reseat the ignition coil connector and check for corrosion or breaks. 2. Inspect the primary wiring back toward the ECM.
- 2
Test coil and replace
1. Measure the coil primary/secondary resistance against spec. 2. Replace a failed coil, then clear the code.
Frequently asked questions
Can a bad coil cause C24?
Yes — a failed coil or its wiring is a common trigger. Test the coil resistance and check the connector before deeper diagnosis.
Last updated July 15, 2026
Guidance only — always consult a qualified professional or the official service manual before carrying out repairs.