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GM 20834656 Alternator

2008-2010 Pontiac G6

Customer Questions & Expert Answers (2)
20834656 GM Alternator Illustration 1 of 1
  • Part Description
    Generator, Engine Electrical
  • Replaces
    25839385, 25958742
  • Manufacturer
    General Motors
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  • Specifications
  • Fitment
  • Q&A
  • Product Specifications

    BrandGenuine GM
    Manufacturer Part Number20834656
    Part DescriptionAlternator; Generator, Engine Electrical
    Item Dimensions14.4 x 10.0 x 8.5 inches
    Item Weight15.30 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    Replaces25839385, 25958742
    ManufacturerGeneral Motors
    SKU20834656
    WarrantyThis genuine GM part is guaranteed by GM's factory warranty.
    Shipping & ReturnShipping Policy Return Policy
    Warning: California's Proposition 65
  • Vehicle Fitment

    Year Make Model Engine Important vehicle option details
    2008-2010 Pontiac G64 Cyl 2.4LGT 2 DOOR CONVERTIBLE, GT 2 DOOR NOTCHBACK, GT 4 DOOR NOTCHBACK, GTP 2 DOOR NOTCHBACK, GXP 2 DOOR NOTCHBACK, GXP 4 DOOR NOTCHBACK, SE 4 DOOR NOTCHBACK, SE1 2 DOOR NOTCHBACK, SE1 4 DOOR NOTCHBACK
  • Customer Questions & Expert Answers

    Q:
    I would like to confirm if this is the correct part number for my vehicle. Please advise. Thank you.
    A:
    You can Select Your Vehicle to check if 20834656 fits your vehicle.
    Posted and answered by GM Parts Specialist Henry
    Q:
    How to remove the Alternator on Pontiac G6? Posted by Ramdas J.
    A:
    To disconnect the cable from the negative battery terminal, you must remove the belt. In order to remove it from a four-cylinder model, you will need to take off the air intake duct and upper radiator hose. For four cylinder engines, pull up on the release tab of the connector and pull it out straight. Removing the alternator's electrical connector for a four-cylinder engine requires that one lifts the release tab with a prying tool before pulling out. The drivebelt idler pulley has to be removed on 3.6L models first. After removing the alternator mounting bolts, lift it out of there carefully but beware not to damage anything else in engine compartment. Remove three mounting bolts when taking off an alternator for a 4-cylinder engine; while for a V6 engine, disconnect its electrical connector and battery cable then remove front mounting bolt and two backside ones (one bolt is not seen). However, getting this device out in 3.6L models may seem tricky at first glance.
    You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Bob / Sep 06, 2025

Genuine GM Part 20834656, the Right Choice

To ensure reliability, purchase GM part # 20834656 Alternator. It is sometimes referred to as GM Alternator. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific Pontiac G6 models.

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