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GMC 21024981 Sensor Assembly, Knock

2001-2005 GMC

Customer Questions & Expert Answers (13)
GM 21024981 Sensor Assembly, Knock
GM 21024981 Sensor Assembly, Knock
GM 21024981 Sensor Assembly, Knock
  • Part Description
    SENSOR, Distributor (also Knock Sensor)
  • Replaces
    21024729
  • Manufacturer
    General Motors
Make sure this part fits
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  • Related Parts
  • Product Specifications
  • Vehicle Fitment
  • Customer Questions & Expert Answers

  • Related Parts

    Shop for related parts for your vehicle

  • Product Specifications

    BrandGenuine GMC
    Manufacturer Part Number21024981
    Part DescriptionSENSOR, Distributor (also Knock Sensor)
    Other NamesKnock Sensor
    Item Dimensions2.0 x 2.1 x 1.1 inches
    Item Weight0.40 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    Replaces21024729
    ManufacturerGeneral Motors
    SKU21024981
    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
    2001 GMC Jimmy6 Cyl 4.3L2 DOOR, 4 DOOR
    2001-2005 GMC Safari6 Cyl 4.3LVAN SAFARI
    2001-2005 GMC Savana6 Cyl 4.3L1 TON CARGO SAVANA, 1 TON COMMERCIAL/RECREATIONAL VEHICLE SAVANA, 1 TON PASSENGER, 1/2 TON CARGO SAVANA, 1/2 TON PASSENGER SAVANA, 3/4 TON CARGO SAVANA, 3/4 TON PASSENGER SAVANA
    2001-2004 GMC Sierra6 Cyl 4.3L1500 EXTENDED CAB LONG BOX, 1500 EXTENDED CAB STANDARD BOX, 1500 REGULAR CAB LONG BOX, 1500 REGULAR CAB STANDARD BOX
    2001-2004 GMC Sonoma6 Cyl 4.3L4 DOOR, PICKUP, PICKUP EXTENDED CAB

  • Customer Questions & Expert Answers

    Q:
    I would like to confirm if this is the correct part number for my vehicle. Please advise. Thank you. Posted by GMPartsGiant Specialist
    A:
    You can Select Your Vehicle to check if 21024981 fits your vehicle.
    Posted by GMPartsGiant Specialist
    Q:
    What needs to be done to remove the CKP sensor on the 2005 Cadillac DeVille? Posted by Customer
    A:
    Remove the intake manifold. Disconnect the CKP sensor wiring harness. Remove the CKP sensor bolt, then remove the sensor. Installation is the reverse of removal.
    Posted by GMPartsGiant Specialist
    See expert answers on similar Crankshaft Position Sensor
    Q:
    What should you do when installing the knock sensor for the 2001 Cadillac DeVille? Posted by Customer
    A:
    When installing the knock sensor, be sure to tighten it to the specific torque.
    Posted by GMPartsGiant Specialist
    See expert answers on similar Knock Sensor
    Q:
    How should the camshaft sensor and crankshaft sensor be checked for the 2004 Chevrolet Blazer? Posted by Customer
    A:
    The camshaft sensor and crankshaft sensor, depending on the engine type, should be checked for resistance and proper signal output.
    Posted by GMPartsGiant Specialist
    See expert answers on similar Crankshaft Position Sensor
    Q:
    What does the oxygen sensor in the exhaust do and how can it be checked for the 2003 Chevrolet Blazer? Posted by Customer
    A:
    The oxygen sensor in the exhaust monitors oxygen content. To check it, you can check its millivolt signal while the engine warms up. It is also important to inspect the oxygen sensor heater and ensure it receives proper voltage.
    Posted by GMPartsGiant Specialist
    See expert answers on similar Knock Sensor
    Q:
    How do you disconnect the CKP sensor on the engine for the 2016 Chevrolet Express? Posted by Customer
    A:
    To disconnect the CKP sensor, start by disconnecting the cable from the negative battery terminal. Then, raise the front end of the vehicle and secure it on jackstands. Next, disconnect the electrical connector from the CKP sensor and remove the sensor mounting bolt. Remove the sensor from the engine and inspect the 0-ring for any damage. If necessary, replace the 0-ring. Apply a small amount of engine oil to the 0-ring and install the CKP sensor, making sure to tighten the mounting bolt securely.
    Posted by GMPartsGiant Specialist
    See expert answers on similar Crankshaft Position Sensor
    Q:
    Where is the knock sensor located on the engine for the 2004 Chevrolet Express? Posted by Customer
    A:
    The knock sensor is located on the rear part of the engine block, to the left of the distributor.
    Posted by GMPartsGiant Specialist
    See expert answers on similar Knock Sensor
    Q:
    How should the camshaft sensor and crankshaft sensor be checked for the 1996 GMC Jimmy? Posted by Customer
    A:
    The camshaft sensor and crankshaft sensor, depending on the engine type, should be checked for resistance and proper signal output.
    Posted by GMPartsGiant Specialist
    See expert answers on similar Knock Sensor
    Q:
    What is the function of the knock sensors and how can they be checked for the 2000 Chevrolet S10? Posted by Customer
    A:
    The knock sensors detect engine knock. To check them, you should check for reference voltage and resistance.
    Posted by GMPartsGiant Specialist
    See expert answers on similar Crankshaft Position Sensor
    Q:
    What does the oxygen sensor in the exhaust do and how can it be checked for the 1994 Chevrolet S10? Posted by Customer
    A:
    The oxygen sensor in the exhaust monitors oxygen content. To check it, you can check its millivolt signal while the engine warms up. It is also important to inspect the oxygen sensor heater and ensure it receives proper voltage.
    Posted by GMPartsGiant Specialist
    See expert answers on similar Knock Sensor
    Q:
    What is the role of the 1997 GMC Jimmy speed sensor (VSS) and how can it be checked? Posted by Customer
    A:
    The vehicle speed sensor (VSS) provides speed data to the PCM. To check it, you can check for reference voltage.
    Posted by GMPartsGiant Specialist
    See expert answers on similar Crankshaft Position Sensor
    Q:
    How should the camshaft sensor and crankshaft sensor be checked for the 1997 GMC Sonoma? Posted by Customer
    A:
    The camshaft sensor and crankshaft sensor, depending on the engine type, should be checked for resistance and proper signal output.
    Posted by GMPartsGiant Specialist
    See expert answers on similar Crankshaft Position Sensor
    Q:
    What does the manifold absolute pressure (MAP) sensor do and how can it be checked for the 1999 GMC Sonoma? Posted by Customer
    A:
    The manifold absolute pressure (MAP) sensor monitors intake manifold pressure changes and varies its voltage output accordingly. To check it, you should check the reference voltage and signal voltage with the ignition on and engine off, and observe voltage changes as the engine's vacuum changes.
    Posted by GMPartsGiant Specialist
    See expert answers on similar Knock Sensor
    If you have any questions about this product, please don't hesitate to ask us. We will be happy to help you!

Genuine GM Part 21024981, the Right Choice

To ensure reliability, purchase GM part # 21024981 Sensor Assembly, Knock. It is sometimes referred to as GMC Crankshaft Position Sensor, GMC Knock Sensor. 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 GMC Savana, Sierra, Sonoma models.

GMPartsGiant.com is a leading supplier of genuine GM parts and accessories such as GM 21024981 Sensor Assembly, Knock. You're certainly in the right place if you're searching for the great cost-effective OEM GM parts. Look no further than our vast inventory of genuine GM parts offered at unbeatable online prices, all of which are backed by the manufacturer's warranty. Not to forget, our hassle-free return policy and quick delivery service ensure a smooth shopping experience for you. For detailed GMC parts information, click here.

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