SPN 520255 — Light switch pulled for more than 60 seconds (SITRAK and Volvo)

Safe to driveUntil the next service

SPN 520255 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by SITRAK and Volvo, and what the second half of the code (FMI) means.

SITRAK

FMI 2	Implausible temperature sensor reading at cold start, combination 2. Scan tool code: P1002. Effect: Fan and warm-up control may misbehave.
FMI 8	Implausible temperature sensor reading at cold start, combination 2. Scan tool code: P1002. Effect: Fan and warm-up control may misbehave.

Volvo

FMI 12

Light switch pulled for more than 60 seconds. Switch damaged, or wiring between the LCM and the switch shorted to ground.

What FMI means in J1939

SPN 520255 FMI 2520255/2 · 520255.2	data erratic or intermittent
SPN 520255 FMI 8520255/8 · 520255.8	abnormal frequency or pulse width
SPN 520255 FMI 12520255/12 · 520255.12	faulty device or component

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

• SPN 520250
• SPN 520251
• SPN 520252
• SPN 520253
• SPN 520254
• SPN 520256LCM output current to the interior lighting lamps is below 500 mA
• SPN 520257Trailer detection sensor faulty
• SPN 520258LCM output voltage is equal to or higher than the LCM supply voltage
• SPN 520260Actual CFV floor pressure above target value
• SPN 520290

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