# Service bulletin 20NA038

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.

- Type: Service bulletin
- NHTSA id: 10172811
- Published by NHTSA: 2020\-03\-30
- Manufacturer's number: 20NA038
- Manufacturer's date: 2020\-02\-26
- NHTSA component: FUEL SYSTEM, DIESEL; ENGINE

## NHTSA's summary

This informational bulletin explains the difference in AFM and DFM engines and what is and is not activated during this occurrence.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10172811-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10172811-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine, Fuel system

## Vehicles listed

- 2016 to 2020 CADILLAC CT6
- 2016 to 2019 CADILLAC CTS
- 2015 to 2020 CADILLAC ESCALADE
- 2015 to 2016 CADILLAC ESCALADE ESV
- 2017 to 2020 CADILLAC ESCALADE ESV
- CHEVROLET 2500 HD
- 2020 CHEVROLET 3500
- 2016 to 2020 CHEVROLET CAMARO
- 2014 to 2020 CHEVROLET CORVETTE
- 2018 to 2020 CHEVROLET EXPRESS
- 2017 CHEVROLET SILVERADO
- 2014 CHEVROLET SILVERADO 1500
- 2018 to 2020 CHEVROLET SILVERADO 1500
- 2015 to 2016 CHEVROLET SILVERADO 2500
- 2018 CHEVROLET SILVERADO 2500
- 2020 CHEVROLET SILVERADO 2500
- 2015 to 2020 CHEVROLET SUBURBAN
- 2015 to 2020 CHEVROLET TAHOE
- 2018 to 2020 GMC SAVANA
- 2017 GMC SIERRA
- 2014 GMC SIERRA 1500
- 2019 to 2020 GMC SIERRA 1500
- 2015 to 2016 GMC SIERRA 2500
- 2018 GMC SIERRA 2500
- 2020 GMC SIERRA 2500
- 2015 to 2016 GMC SIERRA DENALI
- 2018 GMC SIERRA DENALI
- 2015 to 2020 GMC YUKON
- 2015 to 2020 GMC YUKON XL

## Recalls for the same vehicles and component

- [2023040](/recalls/tc/2023040.md), 2023-02-02: Fuel System
- [23V047000](/recalls/nhtsa/23V047000.md), 2023-02-02: FUEL SYSTEM, DIESEL:STORAGE:TANK ASSEMBLY
- [21V346000](/recalls/nhtsa/21V346000.md), 2021-05-13: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\):SOFTWARE
- [19V837000](/recalls/nhtsa/19V837000.md), 2019-11-21: FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP
- [19V328000](/recalls/nhtsa/19V328000.md), 2019-04-25: ENGINE
- [2019055](/recalls/tc/2019055.md), 2019-02-08: Fuel System
- [19V088000](/recalls/nhtsa/19V088000.md), 2019-02-07: FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY
- [2017511](/recalls/tc/2017511.md), 2017-10-20: Fuel System
- [17V664000](/recalls/nhtsa/17V664000.md), 2017-10-19: FUEL SYSTEM, GASOLINE:STORAGE:AUXILLARY TANK
- [14V820000](/recalls/nhtsa/14V820000.md), 2014-12-24: FUEL SYSTEM, DIESEL

## Other bulletins for the same vehicles and component

- [N262576260](/bulletins/11038468.md), 2026-10-15, Service campaign: ENGINE. General Motors has decided to conduct a Voluntary Emission Recall. Certain vehicles may have a condition that could cause a small exhaust leak at the catalytic converter inlet. Dealers are to replace the catalytic converter inlet clamp and to inspect the catalytic converter – replacing it if damage is observed. The repairs will be made at no charge to the customer.
- [N262548050](/bulletins/11031551.md), 2026-04-24, Service bulletin: ENGINE. This message is to inform dealers that Special Coverage N262548050 is being temporarily suspended for the models above. Involved vehicles will be temporarily removed from IVH. Dealers will be notified when repairs can be resumed. We apologize for any inconvenience this situation may cause.
- [N262548050](/bulletins/11031510.md), 2026-04-23, Service campaign: ENGINE. Certain vehicles, may have a condition that could cause the Catalytic Converter to fail. If this failure occurs, the Malfunction Indicator Light \(Check Engine Light\) will illuminate, and a diagnostic trouble code will set. Dealers are to replace the Catalytic Converter as necessary. The repairs will be made at no charge to the customer.
- [00\-06\-01\-026R](/bulletins/11026017.md), 2025-12-03, Service bulletin: ENGINE. This service bulletin provides information on replacing the intake manifold when the engine is replaced after severe internal engine damage.
- [23\-NA\-170](/bulletins/11024486.md), 2025-10-25, Service bulletin: ELECTRICAL SYSTEM; ENGINE. This bulletin advises the tech to inspect deeper into what may be to main cause of an engine failure.
- [23\-NA\-153](/bulletins/11024485.md), 2025-10-25, Service bulletin: ENGINE. The service bulletin advises the tech of a normal transmission shift condition and the delay in throttle response when the throttle plate is opened rapidly and advises the customer that it is normal for the delay.
- [24\-NA\-241](/bulletins/11024332.md), 2025-10-16, Service bulletin: ENGINE. This informational bulletin advises the technician of a part number change for long block engines used in the trucks noted.
- [22\-NA\-080](/bulletins/11024330.md), 2025-10-16, Service bulletin: ENGINE. This technical bulletin provides a procedure to replace the camshaft actuator magnet to correct customer concerns of engine related shudder.
- [18\-NA\-180](/bulletins/11024324.md), 2025-10-16, Service bulletin: ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM. This Warranty Administration service bulletin provides Lithium\-Ion battery Exchange Process and Transaction Submission information.
- [18\-NA\-180](/bulletins/11023365.md), 2025-09-26, Service bulletin: ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM. This Warranty Administration service bulletin provides Lithium\-Ion battery Exchange Process and Transaction Submission information.

JSON: [/v1/bulletins/10172811](/v1/bulletins/10172811)

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