84303178 Genuine GM Engine Wiring Harness Junction Block For Silverado Sierra 4.3L 5.3L 6.2L

84303178 Genuine GM Engine Wiring Harness Junction Block For Silverado Sierra 4.3L 5.3L 6.2L

Name: 84303178 Genuine GM Engine Wiring Harness Junction Block For Silverado Sierra 4.3L 5.3L 6.2L
Brand: GM
SKU: 84303178
Price: 348.00 USD
Availability: InStock

P/N: 84303178 Manufactured by: GM

$348.00 - $348.00

$348.00

$348.00 - $348.00

$348.00

8 in Stock

Condition: New

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Description

The 84303178 is a genuine GM engine wiring harness junction block designed to coordinate electrical connections between the engine harness, fuse system, and vehicle control circuits. This component functions as a centralized interface that routes power and signal pathways required for proper engine electrical operation.

Vehicle Compatibility

Year	Vehicle	Engine	Trims
2019	Chevrolet Silverado 1500 LD	5.3L V8 Flex, 5.3L V8 Gas	Custom, LT, WT
2019	Chevrolet Silverado 2500 HD	6.0L V8 CNG, 6.0L V8 Flex, 6.0L V8 Gas	High Country, LT, LTZ, WT
2019	Chevrolet Silverado 3500 HD	6.0L V8 CNG, 6.0L V8 Flex, 6.0L V8 Gas	High Country, LT, LTZ, WT
2019	GMC Sierra 1500 Limited	5.3L V8 Flex, 5.3L V8 Gas	Base, SLE
2019	GMC Sierra 2500 HD	6.0L V8 CNG, 6.0L V8 Flex, 6.0L V8 Gas	Base, Denali, SLE, SLT
2019	GMC Sierra 3500 HD	6.0L V8 CNG, 6.0L V8 Flex, 6.0L V8 Gas	Base, Denali, SLE, SLT
2018	Chevrolet Silverado 1500	4.3L V6 Flex, 5.3L V8 Electric/Gas, 5.3L V8 Flex, 5.3L V8 Gas, 6.2L V8 Gas	Custom, High Country, LS, LT, LTZ, SSV, WT
2018	Chevrolet Silverado 2500 HD	6.0L V8 CNG, 6.0L V8 Flex, 6.0L V8 Gas	High Country, LT, LTZ, WT
2018	Chevrolet Silverado 3500 HD	6.0L V8 Flex, 6.0L V8 Gas	High Country, LT, LTZ, WT
2018	GMC Sierra 1500	4.3L V6 Flex, 5.3L V8 Electric/Gas, 5.3L V8 Flex, 5.3L V8 Gas, 6.2L V8 Gas	Base, Denali, SLE, SLT
2018	GMC Sierra 2500 HD	6.0L V8 Flex, 6.0L V8 Gas	Base, Denali, SLE, SLT
2018	GMC Sierra 3500 HD	6.0L V8 Flex, 6.0L V8 Gas	Base, Denali, SLE, SLT
2017	Chevrolet Silverado 1500	4.3L V6 Flex, 5.3L V8 Electric/Gas, 5.3L V8 Flex, 5.3L V8 Gas, 6.2L V8 Gas	Custom, High Country, LS, LT, LTZ, SSV, WT
2017	Chevrolet Silverado 2500 HD	6.0L V8 Flex, 6.0L V8 Gas	High Country, LT, LTZ, WT
2017	Chevrolet Silverado 3500 HD	6.0L V8 Flex, 6.0L V8 Gas	High Country, LT, LTZ, WT
2017	GMC Sierra 1500	4.3L V6 Flex, 5.3L V8 Electric/Gas, 5.3L V8 Flex, 5.3L V8 Gas, 6.2L V8 Gas	Base, Denali, SLE, SLT
2017	GMC Sierra 2500 HD	6.0L V8 Flex, 6.0L V8 Gas	Base, Denali, SLE, SLT
2017	GMC Sierra 3500 HD	6.0L V8 Flex, 6.0L V8 Gas	Base, Denali, SLE, SLT

General Specifications

Condition	New
Part Number	84303178
Brand	GM
Part Type	Engine Wiring Harness Junction Block
Years	2017–2019
Vehicle	Chevrolet Silverado / GMC Sierra
Engine	4.3L V6, 5.3L V8, 6.0L V8, 6.2L V8
Dimensions	15.4 x 9.6 x 5.3 inches
Weight	3.70 lb
Fitment Type	Direct Replacement

Product Features

The 84303178 engine wiring harness junction block is built to match factory electrical system performance and installation requirements:

Genuine GM engine wiring harness junction block
Central distribution point for engine electrical connections
Routes power and signal circuits between engine systems and fuse components
Designed to follow the original GM harness layout and mounting locations
Supports proper routing of engine control and electrical supply circuits
Factory-style connectors provide accurate electrical engagement

Application Notes

The 84303178 is designed for GM truck platforms that use this style junction block to organize electrical connections between engine harness circuits and fuse systems. It installs in the original mounting position and connects directly to the factory wiring harness connectors.

Always verify part number, engine configuration, and system type before installation.