CAT 3406E (Prefix 1MM or 2WS) Fault Code: 12 PID: SPN: 111 FMI: 2 Coolant Level signal invalid
The ECM detects the following conditions:
•The coolant level sensor is sending an invalid signal for more than ten seconds.
•The “Coolant Level Sensor” parameter is programmed to “Yes”.
Probable Causes:
1) ECM Connection/Harness
2) Coolant sensor failure
3) Coolant sensor harness failure
4) ECM Failure
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