SPN 520258 — LCM output voltage is equal to or higher than the LCM supply voltage (SITRAK and Volvo)

Safe to driveDrivable, but watch it yourself

SPN 520258 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, overall check. Scan tool code: P1005. Effect: Fan and warm-up control may misbehave.

Volvo

FMI 3	LCM output voltage is equal to or higher than the LCM supply voltage; wiring between the LCM and the component shorted to the supply wire, or sensor faulty.
FMI 4	LCM output voltage is below 2 V. Wires between the LCM and the sensor shorted to ground.

What FMI means in J1939

SPN 520258 FMI 2520258/2 · 520258.2	data erratic or intermittent
SPN 520258 FMI 3520258/3 · 520258.3	voltage above normal or shorted high
SPN 520258 FMI 4520258/4 · 520258.4	voltage below normal or shorted to ground

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: Drivable, but watch it yourself

This is an electrical fault: an open, a short or a bad contact in the sensor circuit. The value it measures is most likely fine.

You can drive. But until the circuit is repaired this system runs blind and cannot warn you about a real failure.

Nearby: other

• SPN 520253
• SPN 520254
• SPN 520255Light switch pulled for more than 60 seconds
• SPN 520256LCM output current to the interior lighting lamps is below 500 mA
• SPN 520257Trailer detection sensor faulty
• SPN 520260Actual CFV floor pressure above target value
• SPN 520290
• SPN 520310Exhaust gas temperature 1 below the lower plausible range limit
• SPN 520392SMU hardware monitoring module
• SPN 520393SMU hardware monitoring module

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