Tmax 2025 key fob/ECU requires emergency start

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Tmax 2025 key fob/ECU requires emergency start

Tmax 2025 key fob/ECU requires emergency start 
Thermos said 2026-04-21 04:35 
 
Hi all,

I’m experiencing an intermittent smart‑key detection failure on my 2025 Yamaha TMAX 560. The issue is unusual because it fails completely silently — no “Key Not Detected” message, no warnings, and no stored ECU errors.

Symptoms

• I can ride home normally in the evening, but the next morning the scooter is completely unresponsive it’s like no key is present.
• The ignition occasionally refuses to activate with no dash warnings at all.
• Emergency start works, and I’ve ridden up to 10 km to different locations, but the issue persists regardless of where I am.
• I have two key fobs, both with new batteries, and the problem occurs with both.
• After several days of only being able to emergency‑start, the key fob begins partially responding:• Seat button lights up and works
• Ignition button lights up and clicks
• But the bike still won’t start
• Then, a day later, everything works normally again

• This “gradual recovery” repeats each time the fault happens.
• Dealer diagnostics show no fault codes.
• The failure is random and disappears before the dealer can take the bike in (they have a backlog).
• Emergency PIN start works every time.
• Dealer cannot reproduce the issue. 
 
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