Safe to driveDrivable, but watch it yourself
J1939 code SPN 1271. Below — how the fault is worded at the factory by SITRAK, and what the second half of the code (FMI) means in the standard.
| FMI 5 | (see item 164, cylinder 4) |
| FMI 6 | Cylinder 4 main ignition coil short circuit |
| FMI 11 | Cylinder 4 spark plug or ignition coil fault |
| SPN 1271 FMI 51271/5 · 1271.5 | current below normal or open circuit |
| SPN 1271 FMI 61271/6 · 1271.6 | current above normal or grounded circuit |
| SPN 1271 FMI 111271/11 · 1271.11 | root cause not known |
Safe to drive. Below — how much time you have and what happens if you keep going.
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.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.