Exhaust Fluid DEF Injector 12688993 for Chevrolet Silverado GMC Sierra 2500 3500 HD 2017-2021
Exhaust Fluid DEF Injector 12688993 for Chevrolet Silverado GMC Sierra 2500 3500 HD 2017-2021
Exhaust Fluid DEF Injector 12688993 for Chevrolet Silverado GMC Sierra 2500 3500 HD 2017-2021
Exhaust Fluid DEF Injector 12688993 for Chevrolet Silverado GMC Sierra 2500 3500 HD 2017-2021
Exhaust Fluid DEF Injector 12688993 for Chevrolet Silverado GMC Sierra 2500 3500 HD 2017-2021
$68.20 Add to cart
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Exhaust Fluid DEF Injector 12688993 for Chevrolet Silverado GMC Sierra 2500 3500 HD 2017-2021

$68.20

Exhaust Fluid DEF Injector 12688993 for Chevrolet Silverado GMC Sierra 2500 3500 HD 2017-2021

Condition: New Aftermarket Part

Note: We recommend replacing the entire set of fuel injectors to ensure the engine’s optimal performance. Due to differences in oil output and atomization concentration between genuine and aftermarket parts, they should not be mixed. Replacing the entire set of injectors helps avoid potential issues.

Replacement Part Number: 12688993

Applications:Fit for following models: Chevrolet Vehicle: 2017 Silverado 2500 HD High Country Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Silverado 2500 HD LT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Silverado 2500 HD LT Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Silverado 2500 HD LT Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Silverado 2500 HD LTZ Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Silverado 2500 HD LTZ Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Silverado 2500 HD WT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Silverado 2500 HD WT Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Silverado 2500 HD WT Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Silverado 3500 HD High Country Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Silverado 3500 HD LT Cab & Chassis 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Silverado 3500 HD LT Cab & Chassis 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Silverado 3500 HD LT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Silverado 3500 HD LT Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Silverado 3500 HD LT Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Silverado 3500 HD LTZ Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Silverado 3500 HD LTZ Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Silverado 3500 HD WT Cab & Chassis 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Silverado 3500 HD WT Cab & Chassis 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Silverado 3500 HD WT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Silverado 3500 HD WT Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Silverado 3500 HD WT Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Silverado 2500 HD High Country Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Silverado 2500 HD LT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Silverado 2500 HD LT Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Silverado 2500 HD LT Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Silverado 2500 HD LTZ Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Silverado 2500 HD LTZ Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Silverado 2500 HD WT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Silverado 2500 HD WT Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Silverado 2500 HD WT Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Silverado 3500 HD High Country Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Silverado 3500 HD LT Cab & Chassis 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Silverado 3500 HD LT Cab & Chassis 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Silverado 3500 HD LT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Silverado 3500 HD LT Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Silverado 3500 HD LT Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Silverado 3500 HD LTZ Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Silverado 3500 HD LTZ Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Silverado 3500 HD WT Cab & Chassis 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Silverado 3500 HD WT Cab & Chassis 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Silverado 3500 HD WT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Silverado 3500 HD WT Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Silverado 3500 HD WT Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Silverado 2500 HD High Country Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Silverado 2500 HD LT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Silverado 2500 HD LT Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Silverado 2500 HD LTZ Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Silverado 2500 HD WT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Silverado 2500 HD WT Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Silverado 2500 HD WT Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Silverado 3500 HD High Country Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Silverado 3500 HD LT Cab & Chassis 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Silverado 3500 HD LT Cab & Chassis 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Silverado 3500 HD LT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Silverado 3500 HD LTZ Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Silverado 3500 HD WT Cab & Chassis 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Silverado 3500 HD WT Cab & Chassis 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Silverado 3500 HD WT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2020 Silverado 2500 HD High Country Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2020 Silverado 2500 HD LT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2020 Silverado 2500 HD LT Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2020 Silverado 2500 HD LT Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2020 Silverado 2500 HD LTZ Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2020 Silverado 2500 HD LTZ Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2020 Silverado 2500 HD WT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2020 Silverado 2500 HD WT Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2020 Silverado 2500 HD WT Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2020 Silverado 3500 HD High Country Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2020 Silverado 3500 HD WT Cab & Chassis 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2020 Silverado 3500 HD WT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2020 Silverado 3500 HD WT Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2020 Silverado 3500 HD WT Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Silverado 2500 HD Custom Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Silverado 2500 HD Custom Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Silverado 2500 HD High Country Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Silverado 2500 HD LT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Silverado 2500 HD LT Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Silverado 2500 HD LT Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Silverado 2500 HD LTZ Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Silverado 2500 HD LTZ Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Silverado 2500 HD WT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Silverado 2500 HD WT Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Silverado 2500 HD WT Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Silverado 3500 HD High Country Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Silverado 3500 HD LT Cab & Chassis 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Silverado 3500 HD LT Cab & Chassis 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Silverado 3500 HD LT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Silverado 3500 HD LT Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Silverado 3500 HD LT Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Silverado 3500 HD LTZ Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Silverado 3500 HD WT Cab & Chassis 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Silverado 3500 HD WT Cab & Chassis 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Silverado 3500 HD WT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Silverado 3500 HD WT Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Silverado 3500 HD WT Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged

GMC Vehicle: 2017 Sierra 2500 HD Base Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Sierra 2500 HD Base Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Sierra 2500 HD Base Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Sierra 2500 HD Denali Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Sierra 2500 HD SLE Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Sierra 2500 HD SLE Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Sierra 2500 HD SLE Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Sierra 2500 HD SLT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Sierra 2500 HD SLT Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Sierra 3500 HD Base Cab & Chassis 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Sierra 3500 HD Base Cab & Chassis 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Sierra 3500 HD Base Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Sierra 3500 HD Base Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Sierra 3500 HD Base Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Sierra 3500 HD Denali Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Sierra 3500 HD SLE Cab & Chassis 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Sierra 3500 HD SLE Cab & Chassis 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Sierra 3500 HD SLE Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Sierra 3500 HD SLE Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Sierra 3500 HD SLE Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Sierra 3500 HD SLT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2017 Sierra 3500 HD SLT Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Sierra 2500 HD Base Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Sierra 2500 HD Base Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Sierra 2500 HD Base Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Sierra 2500 HD Denali Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Sierra 2500 HD SLE Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Sierra 2500 HD SLE Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Sierra 2500 HD SLE Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Sierra 2500 HD SLT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Sierra 2500 HD SLT Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Sierra 3500 HD Base Cab & Chassis 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Sierra 3500 HD Base Cab & Chassis 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Sierra 3500 HD Base Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Sierra 3500 HD Base Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Sierra 3500 HD Base Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Sierra 3500 HD Denali Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Sierra 3500 HD SLE Cab & Chassis 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Sierra 3500 HD SLE Cab & Chassis 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Sierra 3500 HD SLE Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Sierra 3500 HD SLE Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Sierra 3500 HD SLE Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Sierra 3500 HD SLT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2018 Sierra 3500 HD SLT Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Sierra 2500 HD Base Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Sierra 2500 HD Base Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Sierra 2500 HD Base Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Sierra 2500 HD Denali Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Sierra 2500 HD SLE Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Sierra 2500 HD SLE Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Sierra 2500 HD SLT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Sierra 2500 HD SLT Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Sierra 3500 HD Base Cab & Chassis 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Sierra 3500 HD Base Cab & Chassis 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Sierra 3500 HD Base Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Sierra 3500 HD Denali Cab & Chassis 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Sierra 3500 HD Denali Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Sierra 3500 HD SLE Cab & Chassis 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Sierra 3500 HD SLE Cab & Chassis 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Sierra 3500 HD SLE Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2019 Sierra 3500 HD SLT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2020 Sierra 2500 HD AT4 Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2020 Sierra 2500 HD Base Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2020 Sierra 2500 HD Base Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2020 Sierra 2500 HD Base Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2020 Sierra 2500 HD Denali Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2020 Sierra 2500 HD SLE Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2020 Sierra 2500 HD SLE Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2020 Sierra 2500 HD SLE Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2020 Sierra 2500 HD SLT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2020 Sierra 2500 HD SLT Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Sierra 2500 HD AT4 Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Sierra 2500 HD Base Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Sierra 2500 HD Base Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Sierra 2500 HD Base Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Sierra 2500 HD Denali Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Sierra 2500 HD SLE Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Sierra 2500 HD SLE Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Sierra 2500 HD SLE Standard Cab Pickup 2-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Sierra 2500 HD SLT Crew Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged2021 Sierra 2500 HD SLT Extended Cab Pickup 4-Door 6.6L 6599CC 403Cu. In. V8 DIESEL OHV Turbocharged

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Exhaust Fluid DEF Injector 12688993 for Chevrolet Silverado GMC Sierra 2500 3500 HD 2017-2021
Exhaust Fluid DEF Injector 12688993 for Chevrolet Silverado GMC Sierra 2500 3500 HD 2017-2021
$68.20

Exhaust Fluid DEF Injector 12688993 for Chevrolet Silverado GMC Sierra 2500 3500 HD 2017-2021

This DEF injector is engineered as a direct replacement for the Chevrolet Silverado GMC Sierra 2500 3500 HD 2017-2021. Manufactured to meet or exceed OEM specifications, it delivers reliable performance in demanding conditions. Each unit is tested for fuel flow, pressure rating, and durability before leaving the factory to ensure consistent quality across every order.

Vehicle Compatibility

Application Details
Chevrolet Silverado See product specifications

Replaces OEM Part Numbers

12688993 • 2017-2021

Signs You Need a Replacement

If your equipment is showing any of these symptoms, the injectors & nozzle may be the cause:

  • SCR efficiency below threshold (P2047/P2050) — The system detects that the DEF isn’t being dosed correctly. The injector spray pattern is likely degraded or the nozzle is partially blocked.
  • White crystallization on injector tip — Contaminated DEF leaves mineral deposits. If you see white buildup, the injector has been exposed to poor-quality or expired fluid.
  • Derate or limp mode — The ECU limits engine power to prevent emissions violations when the SCR system can’t keep up. This is the most noticeable symptom.
  • DEF consumption suddenly drops — If the tank level doesn’t go down at the normal rate, the injector isn’t spraying. The DEF pump and lines should be checked before replacing the injector.
  • Ammonia smell from exhaust — Incomplete DEF mixing in the exhaust stream means the injector isn’t atomizing properly. The SCR reaction needs fine, even distribution.

Installation Notes

Drain the DEF tank before removing the old injector. Flush the DEF line with distilled water to remove any crystallized deposits. When installing the new injector, use the included sealing gasket and torque to specification — over-tightening cracks the injector housing. After installation, fill the tank with fresh DEF only (check the expiration date on the jug). Run the engine for 15 minutes at operating temperature to allow the SCR system to complete its initialization cycle.

Frequently Asked Questions

Will this fit my Chevrolet 2500?
Yes. This part is designed to fit the Chevrolet 2500, 3500 among other models listed in the compatibility table above. Verify your specific model and engine code before ordering to ensure the correct fit.

Can I cross-reference 12688993 with 2017-2021?
Yes. Both 12688993 and 2017-2021 are interchangeable OEM numbers for this part. They refer to the same component with the same specifications, just different part number revisions.

My vehicle is a 2017 model – is it covered?
The compatibility range for this part includes 2017-2021. The 2017 model year falls within this range, but verify the engine code and body type match. Mid-year production changes sometimes mean two vehicles from the same model year use different parts.

Why do DEF injectors fail repeatedly?
The number one cause is contaminated or expired DEF fluid. DEF degrades over time, especially in hot conditions. If you see white crystallization on the injector tip, the fluid quality was likely poor. Always use fresh DEF and replace the DEF filter when servicing the injector.

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