Safe to driveDrivable, but watch it yourself
SPN 4052 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by Knorr-Bremse EBS and MAN, and what the second half of the code (FMI) means.
| FMI 3 | Power, voltage difference between terminal 30 and 15. Not identified |
| FMI 8 | Power, voltage difference between terminal 30 and 15. Wrong signal |
| FMI 3 | Power voltage difference terminal 30/15 - Not identified |
| FMI 8 | Power voltage difference terminal 30/15 - Wrong signal |
| SPN 4052 FMI 34052/3 · 4052.3 | voltage above normal or shorted high |
| SPN 4052 FMI 84052/8 · 4052.8 | abnormal frequency or pulse width |
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.