Safe to driveDrivable, but watch it yourself
J1939 code SPN 127. Below — how the fault is worded at the factory by Renault Trucks and ZF AS-Tronic, and what the second half of the code (FMI) means in the standard.
| FMI 3 | Control unit internal temperature sensor fault. Repair: Switch the ignition off, switch it on again and repeat the test. If the fault persists, replace the control unit. |
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 3 | No signal from the transmission temperature sensor. |
| SPN 127 FMI 3127/3 · 127.3 | voltage above normal or shorted high |
Safe to drive. Below — how much time you have and what happens if you keep going.
The pressure itself is most likely fine: this is an electrical fault — an open or a short in the sensor circuit, not lost oil.
You can drive, but the dash will no longer warn you about a real pressure drop. Until the circuit is repaired, check the level with the dipstick at every stop.
Shut the engine down. Check the oil level with the dipstick and look underneath for leaks. Don’t restart until pressure is back.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.