GM Genuine Parts Alternator
OE
Pack of 1

GM Genuine Parts Alternator

GM Part #42911849

ACDelco Part #42911849

MSRP$1,867.37*

GM Genuine Parts Alternators are designed, engineered, and tested to rigorous standards, and are backed by General Motors.

  • In 2022 GM began a transition to high-efficiency generators. High efficiency generators support the high electrical loads of today's vehicles
  • The wire fusing and wire gauge size for the generator has been specifically engineered for the GM vehicle application
  • The generator is an active device which has stringent noise and vibration requirements in the GM vehicle application. Fan sizes and bracketry are specifically designed to help prevent noise and vibration

Pack of 1

About this product

GM Genuine Parts Alternators are designed, engineered, and tested to rigorous standards, and are backed by General Motors. GM Genuine Parts alternators, also referred to as generators, are the true OE parts installed during production.OE generators are designed, engineered, tested to rigorous standards and backed by General Motors.The integration of the generator with the vehicle's engine and electrical systems takes years of designing, component and vehicle testing to to meet all GM engineering requirements. That's why GM Genuine Parts OE generators are the only generators recommended for GM vehicles.GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).

Warning WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

  • In 2022 GM began a transition to high-efficiency generators. High efficiency generators support the high electrical loads of today's vehicles
  • The wire fusing and wire gauge size for the generator has been specifically engineered for the GM vehicle application
  • The generator is an active device which has stringent noise and vibration requirements in the GM vehicle application. Fan sizes and bracketry are specifically designed to help prevent noise and vibration
  • GM calibrations are designed for the GM OE generator from a regulator and torque standpoint
  • Remanufactured GM OE generators are also available, depending on vehicle application
  • Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)
  • GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
  • GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
  • GM regularly updates production and service part designs to integrate new materials and technologies

Voltage12DC
Pulley Belt TypeSerpentine
Pulley Groove Quantity4
Terminal Quantity3
Amperage Rating150A
Drive End To Pulley 1st Groove Distance2.24 in / 56.8 mm
Case Circumference5.35 in / 136 mm
Distance Between Mounting Feet5.15 in / 130.7 mm
ClassificationOE
Split Mounting Foot Overall Inner Spacing1.86 in / 47.2 mm
FinishUncoated
External Fan IncludedNo
AC Service TapNo
Fan TypeInternal
Pulley IncludedYes
Outside Pulley Diameter2.48 in / 63 mm
Plug Type365
Decoupled Or Clutch PulleyYes
One Wire CapableYes
Mounting TypeFront Mount
Regulator TypeInternal
Ground TypeNegative
External Regulator IncludedNo
Case MaterialAluminum
Case ColorNatural
Plug Clock Rear View Main Mounting Ear at 6 O Clock2
Rotation DirectionClockwise (Right)
Split Mounting Foot Overall Outside Spacing3.38 in / 85.78 mm
FamilyFGN15
Grade TypeStandard Replacement

24 Months/Unlimited Miles Limited Warranty for Parts (plus Labor if installed by a GM dealer)

Please visit our warranty page on Gmparts.com for full warranty details.

Before purchasing and installing an altenators, make sure it is the correct fit for your vehicle

  • When making repairs on electrical systems, in-depth diagnosis by a trained techncian is needed before parts replacement. This includes checking battery health and diagnostic trouble codes.
  • It is also important that all electrical connections are kept clean and firmly attached, which will make sure the battery is being properly charged by the alternator.
  • Regularly inspect altenators for signs of damage or wear, and replace them if signs of damage are found

Before purchasing and installing an altenators, make sure it is the correct fit for your vehicle

  • When making repairs on electrical systems, in-depth diagnosis by a trained techncian is needed before parts replacement. This includes checking battery health and diagnostic trouble codes.
  • It is also important that all electrical connections are kept clean and firmly attached, which will make sure the battery is being properly charged by the alternator.

ModelBody StyleTrimYear(s)
Encore GX2020, 2021, 2022, 2023, 2024, 2025, 2026

Frequently Asked Questions

Yes, always consult the Vehicle Owner's manual or an expert technician before making any repairs or adjustments.

No, some vehicles require more amperage than others depending on the amount of electronics that need to be operated. Consult the vehicle's information for proper application.