CAT 3406E (Prefix 1MM or 2WS) Fault Code: 12 PID: SPN: 111 FMI: 3 Coolant Level voltage high
The Engine Control Module (ECM) detects the following conditions:
•The signal voltage from the coolant level sensor is greater than 4.5 VDC for more than ten seconds.
•The “Coolant Level Sensor” parameter is programmed to “2-wire Float Sensor”.
•The ECM has been powered for at least two seconds.
Probable Causes:
1) Coolant Level Sensor
2) Coolant Level sensor wiring
3) ECM failure
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