SPN 520809 — No‐Idle CHS relay (International)

Safe to driveUntil the next service

SPN 520809 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by International, and what the second half of the code (FMI) means.

International

FMI 14

No‐Idle CHS relay — No‐Idle Coolant Heater System relay has an open circuit or a shorted circuit

What FMI means in J1939

SPN 520809 FMI 14520809/14 · 520809.14

manufacturer-specific instructions

Can I keep driving

Safe to drive. Below — how much time you have and what happens if you keep going.

What happens if you keep driving

Time you have: Until the next service

A standalone fault with no immediate consequences for driving.

Show the codes at the next service. If a second code from the same system appears, stop putting it off.

Nearby: other

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• SPN 520813Aux Relay Driver _ _ _ 3
• SPN 520814Aux Relay Driver _ _ _ 4

Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.