SPN 40 — factory code ZF AS-Tronic

Safe to driveUntil the next service

SPN 40 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by ZF AS-Tronic, and what the second half of the code (FMI) means.

ZF AS-Tronic

ZF AS-Tronic uses its own fault numbering: the number in the table below is an internal ZF code, not a J1939 SPN. It matches the title of this page by digit only and means something different.

FMI 10

Fault on valve Y8 output circuit (rear splitter group). For AS Tronic 2: engaging the slow group is not possible. For AS Tronic mid: engaging the fast group is not possible.

What FMI means in J1939

SPN 40 FMI 1040/10 · 40.10

abnormal 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: 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 28Accelerator Pedal Position #3
• SPN 29Accelerator Pedal Position #2
• SPN 30Crankcase Pressure
• SPN 34
• SPN 35
• SPN 41
• SPN 42
• SPN 43Power Amp
• SPN 44Power Amp
• SPN 45Power Amp

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