SPN 520939 — Air Brake Pressure Ind Relay Driver (International)

Safe to driveDrivable, but watch it yourself

SPN 520939 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 5	Air Brake Pressure Ind Relay Driver — Air Brake Pressure Indicator Command is Under Current or Open Circuit
FMI 6	Air Brake Pressure Ind Relay Driver — Air Brake Pressure Indicator Command is Overcurrent

What FMI means in J1939

SPN 520939 FMI 5520939/5 · 520939.5	current below normal or open circuit
SPN 520939 FMI 6520939/6 · 520939.6	current above normal or grounded circuit

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 520934AGSP Switch Location 6
• SPN 520935Cluster Switch Location 1
• SPN 520936Cluster Switch Location 2
• SPN 520937TSS Module Power Control
• SPN 520938User Activated Data Logger
• SPN 520940Power Adjustable Pedals Enable Relay
• SPN 520941Hydromax Pump Motor Relay Driver
• SPN 523000Generic Check for implausible EOL Parameters
• SPN 523110Safety Monitor for Valve Combi Function
• SPN 523218

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