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Service bulletins for the 2020 GMC Sierra

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

1990 on file from NHTSA, as of 2026-10-19.

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Only bulletins with component: Exhaust and emissions are shown. Show all

Bulletins, newest first
17NA3742020-11-30. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. This informational bulletin advises the technician of how the Soot information has changed from grams to percentage.
16NA3802020-11-30. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. This informational bulletin provides a procedure on how to perform a quick test to check if the DPF is the cause of excessive soot from the tailpipe.
PIP57482020-09-14. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:DIESEL; EQUIPMENT; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. This Preliminary information communicates to the technition instructions to replace the particulate matter sensor for a P1488 and to use the special labor operation for tracking purposes.
PIP5667D2020-09-14. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM; ENGINE AND ENGINE COOLING:ENGINE:DIESEL. This Preliminary information communicates the part restriction for the diesel engine air delivery and exhaust system components
16NA3802020-08-10. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE. This informational bulletin provides a procedure on how to perform a quick test to check if the DPF is the cause of excessive soot from the tailpipe.
N2023007912020-06-29. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM; FUEL SYSTEM, DIESEL; ENGINE AND ENGINE COOLING:ENGINE:DIESEL. Service Update - In some vehicles, equipped with diesel engines, the Diesel Exhaust Fluid (DEF) system may not immediately reactivate, as it should, after the vehicle?s control system finds that a DEF heater fault is no longer present. In these vehicles, after such a fault is detected as absent, DEF system reactivation, including DEF injection, may not occur until the ignition key is cycled. Dealers are to reprogram the reductant control module.
20NA0392020-03-30. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. This technical bulletin provides a procedure to program the ECM and/or replace the exhaust particulate sensor to correct the DTC that set after the service update has been previously performed.
15NA0102020-03-02. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL. This informational bulletin provides information to dealership personnel for new vehicles with less than 1,000 miles that may not pass California smog inspection or smog inspection in other states.
PIP5503B2020-02-10. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CRANKCASE (PCV). This Preliminary information communicates to the dealer additional information on checking for the engne crankcase being overfull on oil causing an engine vibration concern. The technician is advised to inspect for contaminnants and adjust the engine oil level as needed.
100605002H2019-11-25. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. This informational bulletin provides information on Clean Exhaust Filter See Owners Manual Now or Cleaning Exhaust Filter Keep Driving Until Message is Cleared messages Displayed on DIC, DTC P2463 May Be Set.
16NA3802019-09-23. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE. This informational bulletin provides a procedure on how to perform a quick test to check if the DPF is the cause of excessive soot from the tailpipe.
PIP56672019-09-16. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM; FUEL SYSTEM, DIESEL. This Preliminary information communicates the part restriction for the diesel engine air delivery and exhaust system components

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.