Fitment

Chevrolet / GMC heavy-duty diesel vehicles with SCR AdBlue system including

• Chevrolet Silverado 2500HD 6.6L Duramax diesel (2014–2016)
• Chevrolet Silverado 3500HD 6.6L Duramax diesel
• GMC Sierra 2500HD 6.6L Duramax diesel
• GMC Sierra 3500HD 6.6L Duramax diesel
• Selected GM Duramax LML / LGH SCR diesel platforms

OE reference
12648631
5WK96645D
12642311 (related calibration variant)
12665216 (cross reference family)

FAQ

What is this NOx sensor used for

It measures nitrogen oxide levels in diesel exhaust gas and sends data to ECU for SCR AdBlue emission control system

Is this inlet or outlet sensor

It is commonly used as SCR NOx sensor (Position 1 or Position 2 depending on exhaust layout)

Are 12648631 and 5WK96645D interchangeable

Yes, 5WK96645D is the Continental OEM reference for GM 12648631

What system does it work with

SCR Selective Catalytic Reduction system using AdBlue injection for Euro 5 / Euro 6 diesel emission compliance

What are common failure symptoms

Engine warning light SCR AdBlue fault reduced power limp mode NOx sensor communication error emission efficiency faults