Do not driveTo the nearest safe stop
SPN 14 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by Ford Trucks, Mercedes-Benz and ZF AS-Tronic, and what the second half of the code (FMI) means.
Ford TrucksMercedes-BenzZF AS-Tronic
Ford Trucks/Ecotorq writes fault numbers in its own format: the code in the table below is a Ford code (hexadecimal, zero-padded), not a J1939 SPN. It matches the standard only where the signal itself is standard, and usually matches the title of this page by digit alone.
| FMI 1 | Vehicle Fuel Level Low. FODP code (scan tool): P115A-00. |
| FMI 18 | Battery Voltage Low |
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 0 | Short circuit to ground on the ZF E-module output connected to power take-off 2 (PTO2). |
| SPN 14 FMI 014/0 · 14.0 | data above normal range (most severe level) |
| SPN 14 FMI 114/1 · 14.1 | data below normal range (most severe level) |
| SPN 14 FMI 1814/18 · 14.18 | below normal — moderate severity |
Do not drive. Stop as soon as it’s safe to do so — don’t keep going.
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.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.