ECM Controllers & Monitors

478-7932 Engine ECM for Cat C9 814F II 336D2; Reman Alternative 20R-8181

Q: What numbers are documented for 478-7932?

Primary Part Number: 478-7932. Remanufactured Alternative: 20R-8181. Formatted Alias: 4787932. Relationship labels distinguish formatting aliases, direct interchanges, remanufactured references and related assemblies.

Q: How do I confirm 478-7932 before ordering?

Match the complete part number, compare the connector or mounting arrangement with the product photos, and confirm the machine or engine model and serial range. Send clear photos of the original unit when requesting a quote.

478-7932 Engine ECM for Cat C9 814F II 336D2; Reman Alternative 20R-8181, OEM/reference 478-7932, Engine Electronic Control Module, product view 1

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OEM / reference478-7932

SpecificationEngine Electronic Control Module

Catalog ID51138426

Electronic engine control group identified by part number 478-7932. The official Cat parts page describes the unit as a basic A4E 4V2 machine electronic control group and lists C9 Industrial engines plus broad heavy-equipment applications including 814F II and 336D2 excavator variants. Cat identifies 20R-8181 as a remanufactured ECM alternative, not a formatting alias. Confirm the machine serial number, engine arrangement, connector and required software before installation.

Product Type: Engine Electronic Control Module
Product Brand: EexcavaStart
Control Group: Basic A4E 4V2 machine configuration
Programming: Machine-specific software/configuration required
Condition: New replacement part

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Part-number relationships

Relationship	Reference family	Number
Primary Part Number	Cat electronic control group	478-7932
Remanufactured Alternative	Official Cat Reman electronic control module	20R-8181
Formatted Alias	Same primary number without separator	4787932

Product fitment guide

Part numbers and compatible models

Quickly compare the reference number and recorded machine applications. Use the original photos and the checklist before ordering.

Part identification

Reference numbers

Primary number

478-7932

Formatting alias

4787932

Remanufactured number

20R-8181

Formatting aliases are the same number written differently. Related assemblies and remanufactured numbers are not presented as direct interchanges.

Product summary

Engine Electronic Control Module

Category: ECM Controllers & Monitors
Catalog ID: 51138426
Photo views: 5

Before ordering

Confirm these details

Match the complete part number on the original component label.
Compare the front layout and visible configuration with the product photos.
Compare connector count, connector shape and keying before installation.
Confirm the exact machine model and serial range before ordering.

Machine fitment

Compatible model references

5 model references

Engine: Cat C9 Industrial
Wheel dozer / compactor: Cat 814F II / 815F II / 816F II
Excavator: Cat 336D2 / 336D2 L / 340D2 L / 345D L
Articulated truck: Cat 725 / 730 / 735 / 740
Fitment limitation: Confirm serial number, engine arrangement, connector and software

Compatibility lists identify searchable model families, not every production serial range. Confirm the original part number and machine serial number before purchase.

Quick fitment answers

Common questions about 478-7932

Which machines use 478-7932?

Recorded compatible model references include Engine: Cat C9 Industrial, Wheel dozer / compactor: Cat 814F II / 815F II / 816F II, Excavator: Cat 336D2 / 336D2 L / 340D2 L / 345D L, Articulated truck: Cat 725 / 730 / 735 / 740, Fitment limitation: Confirm serial number, engine arrangement, connector and software. Confirm the complete part number and machine serial range before ordering.

What numbers are documented for 478-7932?

Formatting aliases for the same number: 4787932. Remanufactured references: 20R-8181.

How do I confirm 478-7932 before ordering?

Match the complete part number on the original component label. Compare the front layout and visible configuration with the product photos. Compare connector count, connector shape and keying before installation. Send clear photos of the original unit and connector layout when requesting a quote.

Continue comparing verified references from the same system.

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