SPN 520392 — SMU hardware monitoring module (SITRAK and Volvo)

Safe to driveUntil the next service

SPN 520392 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

SMU hardware monitoring module: alarm group 6, failure 17. Scan tool code: P3137. Effect: Torque limited, the engine may shut down.

Volvo

FMI 9

LCM (MID216) is not receiving signals from the engine control unit (MID128) over the SAE J1939 data link. Open or partially damaged data link wiring between the units; engine control unit may be faulty.

What FMI means in J1939

SPN 520392 FMI 2520392/2 · 520392.2	data erratic or intermittent
SPN 520392 FMI 9520392/9 · 520392.9	abnormal update rate

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 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
• SPN 520310Exhaust gas temperature 1 below the lower plausible range limit
• SPN 520393SMU hardware monitoring module
• SPN 520394SMU hardware monitoring module
• SPN 520398SMU hardware monitoring module
• SPN 520399SMU hardware monitoring module
• SPN 520406The MoC function monitoring requested a fuel cut-off

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