DerateCaterpillar Diesel ECM

SPN 358 FMI 4

Name: ECM Performance
Address: Fort Lauderdale, FL, 33325, US
Telephone: (888) 768-2447
Price range: $$-$$$

Engine protection and emissions inducement power-limiting faults.

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Active derate — truck is losing power now

System

Caterpillar Derate

Caterpillar ECM Service

Diagnostic Overview

CAT fault code 358-4 indicates that the ECM is seeing a low-voltage condition on the circuit associated with SPN 358. Depending on engine family and calibration, that signal may contribute to engine control, protection, or derate logic. FMI 4 usually means voltage below normal or shorted low, so the problem is often electrical rather than mechanical. The exact component name must be verified in Cat ET before parts are replaced.

Likely Causes

Short to ground; failed sensor; damaged wiring; poor connector contact; moisture intrusion; low reference voltage; incorrect sensor installed.

What To Check First

Identify the SPN 358 component in Cat ET, inspect the connector, check reference voltage and signal voltage, and test for a short to ground.

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Internal Linking

Related Derate Fault Codes

View All Derate Codes

03-0042-07

The entry 03-0042-07 appears to be a CAT-style diagnostic or flash-code formatted entry rather than a standard SPN/FMI pair.

0FD205798

The entry 0FD205798 does not look like a standard CAT SPN/FMI or event code.

E039 / EID 39

CAT event code E039 or EID39 is an engine protection event that may contribute to warning, derate, or shutdown depending on severity and calibration.

E041 / EID 41

CAT event code E041 or EID41 should be treated as a condition-based engine event that may be related to protection or derate logic.

E361

CAT event code E361 is commonly treated as an engine protection event that can produce warnings or derate depending on severity and the machine calibration.

E362

CAT event code E362 is another engine protection event that may be listed with derate complaints.

View All Derate Codes →