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SPN 609 — Controller #2

Do not driveTo the nearest safe stop

J1939 code SPN 609. Below — how the fault is worded at the factory by Knorr-Bremse EBS, MAN, Mercedes-Benz and Renault Trucks, and what the second half of the code (FMI) means in the standard.

Knorr-Bremse EBSMANMercedes-BenzRenault Trucks

Knorr-Bremse EBS

FMI 0Central control unit in controller. Undefined fault

MAN

FMI 0Central control unit - Undefined fault

Mercedes-Benz

FMI 16Internal temperature of CPC4 too high

Renault Trucks

FMI 2EECU internal fault. Repair: Replace the EECU control unit.
FMI 3EECU internal fault. Repair: Replace the EECU control unit.
FMI 6EECU internal fault. Repair: Replace the EECU control unit.
FMI 8EECU internal fault. Repair: Replace the EECU control unit.

What FMI means in J1939

SPN 609 FMI 0609/0 · 609.0data above normal range (most severe level)
SPN 609 FMI 2609/2 · 609.2data erratic or intermittent
SPN 609 FMI 3609/3 · 609.3voltage above normal or shorted high
SPN 609 FMI 6609/6 · 609.6current above normal or grounded circuit
SPN 609 FMI 8609/8 · 609.8abnormal frequency or pulse width
SPN 609 FMI 16609/16 · 609.16above normal — moderate severity

Can I keep driving

Do not drive. Stop as soon as it’s safe to do so — don’t keep going.

What happens if you keep driving

Time you have: To the nearest safe stop

The code is flagged critical: the manufacturer considers it unsafe to keep driving without checking.

This code alone cannot say what will fail next, so stop at the first safe opportunity and look at it on the spot.

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

Nearby: other

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