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SPN 3673 — Engine throttle valve 2 position

Safe to driveEnough to reach the yard

J1939 code SPN 3673. Below — how the fault is worded at the factory by SITRAK, and what the second half of the code (FMI) means in the standard.

SITRAK

FMI 1Open load in the throttle valve H-bridge. Scan tool code: P2100. Effect: Torque may be limited.
FMI 2Over-current in the throttle valve H-bridge. Scan tool code: P2100. Effect: Torque may be limited.
FMI 3High voltage on TPS2
FMI 4Low voltage on TPS2
FMI 5Short to battery on output 2 of the throttle valve H-bridge. Scan tool code: P2100. Effect: Torque may be limited.
FMI 6Short to ground on output 1 of the throttle valve H-bridge. Scan tool code: P2100. Effect: Torque may be limited.
FMI 7Short to ground on output 2 of the throttle valve H-bridge. Scan tool code: P2100. Effect: Torque may be limited.
FMI 8Short circuit overload in the throttle valve H-bridge. Scan tool code: P2100. Effect: Torque may be limited.
FMI 9Temperature-dependent over-current in the throttle valve H-bridge. Scan tool code: P2100. Effect: Torque may be limited.
FMI 10Undervoltage in the throttle valve H-bridge. Scan tool code: P2100. Effect: Torque may be limited.

What FMI means in J1939

SPN 3673 FMI 13673/1 · 3673.1data below normal range (most severe level)
SPN 3673 FMI 23673/2 · 3673.2data erratic or intermittent
SPN 3673 FMI 33673/3 · 3673.3voltage above normal or shorted high
SPN 3673 FMI 43673/4 · 3673.4voltage below normal or shorted to ground
SPN 3673 FMI 53673/5 · 3673.5current below normal or open circuit
SPN 3673 FMI 63673/6 · 3673.6current above normal or grounded circuit
SPN 3673 FMI 73673/7 · 3673.7mechanical system not responding
SPN 3673 FMI 83673/8 · 3673.8abnormal frequency or pulse width
SPN 3673 FMI 93673/9 · 3673.9abnormal update rate
SPN 3673 FMI 103673/10 · 3673.10abnormal rate of change

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: Enough to reach the yard

Boost is not reaching its target: turbo, intercooler or intake. The engine compensates with mixture and runs hotter than usual.

You will lose pull, burn more fuel and add overheating on long climbs. If you hear a whine or a whistle from the turbo, stop — the wheel is breaking up.

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.

That said, the manufacturer flags this code as critical — if in doubt, it is safer to stop and check on the spot.

What to check on the spot

Inspect the air filter and charge-air hoses: leaks and cracks produce exactly these codes.

Nearby: intake / boost

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