CAT 3406E (Prefix 1MM or 2WS) Fault Code: 00 PID: SPN: 52 FMI: 11 Air Inlet Shutoff Shutdown

Posted by PerDiezel Solutions on January 13, 2026

This code indicates that the engine was shutdown due to an engine overspeed condition.

Probable Failures:

1) Talk to the driver.
2) If no driver error, issue may be in the Air Inlet Shutoff Circuit
3) Test air inlet shutoff switch & wiring
4) Transmission nuetral switch/wiring
5) Air shut off valve solenoid
6) Air inlet shutoff relay
7) ECM Failure

CAT 3406E (Prefix 5DS or 1LW) Fault Code: 74 PID: 5 SPN: FMI: 11 Cylinder #5 Injector current fault

CAT 3406E (Prefix 5DS or 1LW) Fault Code: 73 PID: 4 SPN: FMI: 11 Cylinder #4 Injector current fault

CAT 3406E (Prefix 5DS or 1LW) Fault Code: 73 PID: 3 SPN: FMI: 11 Cylinder #3 Injector current fault

CAT 3406E (Prefix 5DS or 1LW) Fault Code: 72 PID: 2 SPN: FMI: 11 Cylinder #2 Injector current fault

CAT 3406E (Prefix 5DS or 1LW) Fault Code: 72 PID: 1 SPN: FMI: 11 Cylinder #1 Injector current fault

CAT 3406E (Prefix 5DS or 1LW) Fault Code: 71 PID: 43 SPN: FMI: 2 Key Switch Fault

WARNING!