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GM 12556070
Check Valve

1999-2001 GM

Customer Questions & Expert Answers (6)
GM 12556070 Check Valve
GM 12556070 Check Valve
GM 12556070 Check Valve
GM 12556070 Check Valve
GM 12556070 Check Valve
GM 12556070 Check Valve
  • Part Description
    Valve Assembly-Secondary Air Injection Check
  • Manufacturer
    General Motors
  • Manufacturer's Notes
    This part is discontinued.
Make sure this part fits
  • Related Parts
  • Product Specifications
  • Vehicle Fitment
  • Customer Questions & Expert Answers
  • 2001 GMC Yukon Check Valve Diagram for 12556070
    The diagram listed above is for your reference. View diagram for your vehicle

    Related Parts for 12556070

  • Product Specifications

    BrandGenuine GM
    Manufacturer Part Number12556070
    Part DescriptionValve Assembly-Secondary Air Injection Check
    Other NamesValve, Emission Control System
    Item Dimensions3.1 x 3.2 x 3.1 inches
    Item Weight0.50 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    ManufacturerGeneral Motors
    SKU12556070
    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 Trim Engine
    1999-2001 Chevrolet Silverado 1500Base, LS, LT6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L GAS
    1999-2000 Chevrolet Silverado 2500Base, LS, LT8 Cyl 5.3 L GAS
    2001 Chevrolet Silverado 2500 HDBase, LS, LT8 Cyl 8.1 L GAS
    2001 Chevrolet Silverado 3500Base, LS, LT8 Cyl 8.1 L GAS
    2000-2001 Chevrolet Suburban 1500Base, LS, LT8 Cyl 5.3 L GAS
    2001 Chevrolet Suburban 2500Base, LS, LT8 Cyl 8.1 L GAS
    2000-2001 Chevrolet TahoeBase, LS, LT8 Cyl 4.8 L GAS, 8 Cyl 5.3 L GAS
    1999-2001 GMC Sierra 1500SL, SLE, SLT6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L GAS
    1999-2000 GMC Sierra 2500SL, SLE, SLT8 Cyl 5.3 L GAS
    2001 GMC Sierra 2500 HDSL, SLE, SLT8 Cyl 8.1 L GAS
    View More

  • Customer Questions & Expert Answers

    Q:
    Is this 12556070 designed for my car? Posted by ChevyPartsGiant Specialist
    A:
    Please Select Your Vehicle model to see if part number 12556070 is suitable before ordering.
    Posted by ChevyPartsGiant Specialist
    Q:
    How to replace the Secondary Air Injection Check Valve/Pipe on Bank 2 on Chevrolet Suburban 1500? Posted by Customer
    A:
    To replace the Secondary Air Injection Check Valve/pipe on bank 2, remove the clamps and air hoses from the air system right pipe and disconnect the check valve from the air pipe and the right air pipe from the Exhaust Manifold. Before replacing the existing check valve, test the existing check valve by connecting a Vacuum Pump to the nipple side (AIR pump side) of the check valve and pumping up to 10 inches h g and observing the gauge. If the bleed down time of the vacuum to zero is less than 5 seconds, the check valve should be replaced. To install the new check valve, attach the same to the air pipe and tighten it at a torque value of 23 n.m (17 lb ft) then connect the right air pipe to the Exhaust Manifold and tighten it to a torque value of 20 n.m (15 lb ft). Finally, install the hose and clamp to the check valve and check air system for proper operation.
    Posted by ChevyPartsGiant Specialist
    Q:
    How to service the Air Inject Check Valve on Chevrolet Suburban 1500? Posted by Customer
    A:
    The next step for servicing the air injection control valve begins with removing the clamp securing the Air Hose first from the air pump assembly base followed by the clamp securing the Air Hose from the air pump shut-off valve. Detach the vacuum line from the vacuum port of the air pump shut-off valve while removing the Air Hose from its outlet port. Proceed by releasing the air pump shut-off valve inlet port so it disconnects from the outlet hose of the air pump. The installation sequence begins by hooking up the air pump outlet hose to the air pump shut-off valve inlet port after which the vacuum line should be joined to the air pump shut-off valve vacuum port. Reposition the Air Hose to join the air pump shut-off valve inlet port before fastening it with a clamp while connecting the Air Hose to the air pump assembly base with a clamp.
    Posted by ChevyPartsGiant Specialist
    Q:
    How to replace the Secondary Air Injection Check Valve/Pipe on Bank 1 on GMC Yukon XL 1500? Posted by Customer
    A:
    The first step for replacing the bank 1 Secondary Air Injection Check Valve/pipe involves removing its clamp then disconnecting the Air Hose. The replacement process begins by six steps. The technician must first remove the check valve from the left air pipe before taking out the air pipe from the Exhaust Manifold. The check valve replacement requires a valve operation inspection through a Vacuum Pump connection to the check valve nipple (AIR pump side) with 10 inches hg pressure and 5-second vacuum decay observation for decision-making. The check valve installation requires the attachment to the air pipe with 23 n.m (17 lb ft) torque followed by the air pipe hook-up to the Exhaust Manifold using 20 n.m (15 lb ft) torque. Last step involves attaching the hose from the check valve and tightening it with the provided clamp.
    Posted by ChevyPartsGiant Specialist
    Q:
    How to service the Air Inject Check Valve on Chevrolet Tahoe? Posted by Customer
    A:
    The next step for servicing the air injection control valve begins with removing the clamp securing the Air Hose first from the air pump assembly base followed by the clamp securing the Air Hose from the air pump shut-off valve. Detach the vacuum line from the vacuum port of the air pump shut-off valve while removing the Air Hose from its outlet port. Proceed by releasing the air pump shut-off valve inlet port so it disconnects from the outlet hose of the air pump. The installation sequence begins by hooking up the air pump outlet hose to the air pump shut-off valve inlet port after which the vacuum line should be joined to the air pump shut-off valve vacuum port. Reposition the Air Hose to join the air pump shut-off valve inlet port before fastening it with a clamp while connecting the Air Hose to the air pump assembly base with a clamp.
    Posted by ChevyPartsGiant Specialist
    Q:
    How to service the Air Inject Check Valve on GMC Yukon XL 1500? Posted by Customer
    A:
    The next step for servicing the air injection control valve begins with removing the clamp securing the Air Hose first from the air pump assembly base followed by the clamp securing the Air Hose from the air pump shut-off valve. Detach the vacuum line from the vacuum port of the air pump shut-off valve while removing the Air Hose from its outlet port. Proceed by releasing the air pump shut-off valve inlet port so it disconnects from the outlet hose of the air pump. The installation sequence begins by hooking up the air pump outlet hose to the air pump shut-off valve inlet port after which the vacuum line should be joined to the air pump shut-off valve vacuum port. Reposition the Air Hose to join the air pump shut-off valve inlet port before fastening it with a clamp while connecting the Air Hose to the air pump assembly base with a clamp.
    Posted by ChevyPartsGiant Specialist
    If you have any questions about this product, please don't hesitate to ask us. We will be happy to help you!

OEM GM 12556070, Excellent Performance and Perfect Fitment

To ensure reliability, purchase GM part # 12556070 Check Valve. It is sometimes referred to as GM Air Inject Check Valve, GM Diverter Valve, GM Secondary Air Injection Check Valve. Choosing OEM parts is the optimal decision for guaranteeing superior quality and perfect performance. These components undergo stringent quality checks and are carefully constructed to comply with GM's factory specifications, ensuring a smooth installation process.

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