Do not driveMinutes
SPN 4076 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, MAN and SITRAK, and what the second half of the code (FMI) means.
| FMI 0 | Pressure control unit, checksum error external memory. Undefined fault |
| FMI 0 | Pressure control unit external memory checksum error - Undefined fault |
| FMI 22 | Coolant temperature downstream above threshold 1. Scan tool code: P0115. Effect: Fan and warm-up control may misbehave. |
| FMI 23 | Coolant temperature downstream above threshold 2. Scan tool code: P0115. Effect: Fan and warm-up control may misbehave. |
| FMI 24 | Coolant temperature downstream above threshold 3. Scan tool code: P0115. Effect: Fan and warm-up control may misbehave. |
| SPN 4076 FMI 04076/0 · 4076.0 | data above normal range (most severe level) |
Do not drive. Stop as soon as it’s safe to do so — don’t keep going.
The engine is already past its temperature limit. An aluminium head goes fast: first the geometry warps, then the gasket burns through.
Next comes a blown head gasket, a damaged head and, at worst, a cracked block. Shut it down and let it cool — never open the expansion tank cap while hot.
Let the engine cool — never open the expansion tank cap while hot. Then check the level and the hoses.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.