CAT 3406E (Prefix 1MM or 2WS) Fault Code: 14 PID: SPN: 121 FMI: 6 Low/High Retarder current high

The Engine Control Module (ECM) detects the following conditions:

•The ECM detects a low current condition (open circuit) for one second while the ECM is attempting to energize the solenoid for cylinders 3 and 4.
•The engine retarder switch is in the low or high position.

Probable Causes:

1) ECM Connection/Harness
2) Harness between the ECM and valve cover base
3) Engine retarder solenoid failure
4) Harness under valve cover
5) ECM Failure
6) Harness at bulkhead connector

Categories 3406E (Prefix 1MM or 2WS), CAT, DTC TRUCKS Tags 121, 14, 1MM, 2WS, 3406E, 6, CAT, Code, Current, Fault, FMI, High, Low/High, or, PID, Prefix, Retarder, SPN

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