Safe to driveDrivable, but watch it yourself
J1939 code SPN 972. Below — how the fault is worded at the factory by International and Mercedes-Benz, and what the second half of the code (FMI) means in the standard.
| FMI 2 | Accelerator Interlock Switch — Accelerator Interlock Switch Error |
| FMI 6 | Accelerator Interlock Switch — Over current for Accelerator Interlock Switch Indicator |
| FMI 2 | Throttle inhibit switch signal not plausible due to excess vehicle speed |
| SPN 972 FMI 2972/2 · 972.2 | data erratic or intermittent |
| SPN 972 FMI 6972/6 · 972.6 | current above normal or grounded circuit |
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.