# Service bulletin 18NA073

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: 10187745
- Published by NHTSA: 2021\-03\-01
- Manufacturer's number: 18NA073
- Manufacturer's date: 2021\-01\-22
- NHTSA component: ENGINE

## NHTSA's summary

This service bulletin provides graphics, information and guidelines for engine component wear to assist service personnel as a guideline to perform necessary engine repairs and prevent unnecessary engine replacement.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10187745-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10187745-9999.pdf)

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

## Components

Engine

## Vehicles listed

- 2016 to 2019 BUICK CASCADA
- 2015 to 2021 BUICK ENCLAVE
- 2015 to 2021 BUICK ENCORE
- 2020 to 2021 BUICK ENCORE GX
- 2016 to 2021 BUICK ENVISION
- 2015 to 2019 BUICK LACROSSE
- 2015 to 2020 BUICK REGAL
- 2015 to 2017 BUICK VERANO
- 2015 to 2019 CADILLAC ATS
- 2020 to 2021 CADILLAC CT4
- 2020 to 2021 CADILLAC CT5
- 2016 to 2020 CADILLAC CT6
- 2015 to 2019 CADILLAC CTS
- 2015 to 2017 CADILLAC ELR
- 2015 to 2020 CADILLAC ESCALADE
- 2015 to 2016 CADILLAC ESCALADE ESV
- 2017 to 2021 CADILLAC ESCALADE ESV
- 2021 CADILLAC ESCALADE NA
- 2015 to 2016 CADILLAC SRX
- 2019 to 2021 CADILLAC XT4
- 2017 to 2021 CADILLAC XT5
- 2020 to 2021 CADILLAC XT6
- 2015 to 2019 CADILLAC XTS
- 2016 CHEVROLET 3500
- 2018 to 2019 CHEVROLET 3500
- 2020 CHEVROLET 3500
- 2018 to 2020 CHEVROLET 4500HD
- 2018 to 2020 CHEVROLET 5500HD
- 2015 to 2018 CHEVROLET AVEO
- 2019 to 2021 CHEVROLET BLAZER
- 2015 to 2021 CHEVROLET CAMARO
- 2015 to 2017 CHEVROLET CAPRICE
- 2015 to 2018 CHEVROLET CAPTIVA
- 2015 to 2017 CHEVROLET CHEVEROLET SS
- 2017 CHEVROLET CHEYENNE
- 2015 to 2016 CHEVROLET CITY EXPRESS
- 2015 to 2021 CHEVROLET COLORADO
- 2015 to 2019 CHEVROLET CORVETTE
- 2021 CHEVROLET CORVETTE
- 2015 to 2019 CHEVROLET CRUZE
- 2015 to 2021 CHEVROLET EQUINOX
- 2015 to 2021 CHEVROLET EXPRESS
- 2015 to 2020 CHEVROLET IMPALA
- 2017 CHEVROLET LOW CAB FORWARD 4500
- 2017 CHEVROLET LOW CAB FORWARD 5500
- 2018 CHEVROLET LOW CAB FORWARD 6500
- 2015 to 2021 CHEVROLET MALIBU
- 2015 to 2016 CHEVROLET N300
- 2018 CHEVROLET N300
- 2017 CHEVROLET N300 MAX
- 2017 CHEVROLET ORLANDO
- 2016 to 2018 CHEVROLET S10
- 2017 to 2021 CHEVROLET SILVERADO 1500
- 2015 to 2021 CHEVROLET SILVERADO 2500
- 2017 CHEVROLET SILVERADO 3500
- 2021 CHEVROLET SILVERADO 3500
- 2019 to 2020 CHEVROLET SILVERADO 4500
- 2015 to 2020 CHEVROLET SONIC
- 2015 to 2021 CHEVROLET SPARK
- 2015 to 2017 CHEVROLET SPARK EV
- 2015 to 2021 CHEVROLET SUBURBAN
- 2015 to 2021 CHEVROLET TAHOE
- 2017 to 2020 CHEVROLET TRAILBLAZER
- 2021 CHEVROLET TRAILBLAZER
- 2015 to 2021 CHEVROLET TRAVERSE
- 2015 to 2021 CHEVROLET TRAX
- 2015 to 2019 CHEVROLET VOLT
- 2015 to 2021 GMC ACADIA
- 2015 to 2021 GMC CANYON
- 2015 to 2021 GMC SAVANA
- 2019 to 2021 GMC SIERRA 1500
- 2015 to 2021 GMC SIERRA 2500
- 2015 to 2019 GMC SIERRA DENALI
- 2015 to 2021 GMC TERRAIN
- 2015 to 2021 GMC YUKON
- 2015 to 2021 GMC YUKON XL

## Recalls for the same vehicles and component

- [2025225](/recalls/tc/2025225.md), 2025-04-24: Engine
- [25V274000](/recalls/nhtsa/25V274000.md), 2025-04-24: ENGINE AND ENGINE COOLING:ENGINE:HARD PARTS INTERNAL/MECHANICAL
- [21V346000](/recalls/nhtsa/21V346000.md), 2021-05-13: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\):SOFTWARE
- [2019449](/recalls/tc/2019449.md), 2019-09-06: Engine
- [19V642000](/recalls/nhtsa/19V642000.md), 2019-09-06: ENGINE; ELECTRICAL SYSTEM:SOFTWARE; FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:INJECTORS
- [19V328000](/recalls/nhtsa/19V328000.md), 2019-04-25: ENGINE
- [2014577](/recalls/tc/2014577.md), 2014-12-18: Engine
- [14V007000](/recalls/nhtsa/14V007000.md), 2014-01-13: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM

## 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.
- [N262552620](/bulletins/11032588.md), 2026-05-11, Service campaign: ENGINE. Certain vehicles may have a condition that could cause the cylinder 2 glow plug to fail. If this failure occurs, the Malfunction Indicator Light \(Check Engine Light\) will illuminate and a diagnostic trouble code will set. This special coverage covers the condition described above for a period of 15 years or 150,000 miles \(240,000 km\), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership. For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after May 11, 2026, are covered by this special coverage and must be submitted using the labor operation codes provided with this bulletin. Claims with repair orders prior to May 11, 2026, must be submitted to the Service Contract provider. Vehicle owners or lessees who paid for repairs referenced in this Special Coverage \(“Customers”\) are eligible for reimbursement of their reasonable and customary expenses in accordance with the procedures specified below. The conditional right to reimbursement is provided by GM solely in the interest of customer satisfaction and is personal to Customers. Customers may not assign and GM does not consent to any assignment of any Customer’s right to submit reimbursement claims, or to receive reimbursement, or any other rights granted by this Special Coverage to any third party, including but not limited to service contract providers, and this Special Coverage is not intended to and does not confer any third party beneficiary, subrogation or contribution rights, or any other rights to reimbursement, against GM, whether in law, equity or otherwise, on any third parties. Dealers are to replace the cylinder 2 glow plug as necessary. 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.
- [N252494003\-02](/bulletins/11027714.md), 2026-01-21, Service campaign: ENGINE. Certain vehicles listed above, may have a condition where the connecting rod and/or crankshaft engine components in these vehicles may have manufacturing defects that can lead to engine damage and engine failure. This special coverage covers if an engine failure occurs in the vehicle as a result of the condition described above for a period of 10 years or 150,000 miles \(240,000 km\), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership. For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after May 23, 2025, are covered by this special coverage and must be submitted using the labor operation codes provided with this bulletin. Claims with repair orders prior to May 23, 2025, must be submitted to the Service Contract provider. Vehicle owners or lessees who paid for repairs referenced in this Special Coverage \(“Customers”\) are eligible for reimbursement of their reasonable and customary expenses in accordance with the procedures specified below. The conditional right to reimbursement is provided by GM solely in the interest of customer satisfaction and is personal to Customers. Customers may not assign and GM does not consent to any assignment of any Customer’s right to submit reimbursement claims, or to receive reimbursement, or any other rights granted by this Special Coverage to any third party, including but not limited to service contract providers, and this Special Coverage is not intended to and does not confer any third party beneficiary, subrogation or contribution rights, or any other rights to reimbursement, against GM, whether in law, equity or otherwise, on any third parties. Dealers are to replace the engine. 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.
- [22\-NA\-007](/bulletins/11025552.md), 2025-11-15, Service bulletin: ENGINE; ELECTRICAL SYSTEM. This service bulletin provides procedures to correct customer concerns of Poor Engine Performance in Extremely Cold Weather Conditions, Charge Air Cooler \(CAC\) Icing \- Malfunction Indicator Lamp \(MIL\) Illuminated with DTCs P0299, P0234, P0236, P2227, P00C7 Set.
- [25\-NA\-339](/bulletins/11025492.md), 2025-11-12, Service bulletin: ENGINE. Under Field Actions N252494000, N252494001, the service procedure includes performing a PICO test on vehicle engines within the identified suspect VIN population. If the engine passes the PICO test, the engine oil will be changed from 0W20 to Mobil 1 Supercar 0W40 dexosR. From that point forward, the engine must use 0W40 dexosR oil products for all future oil change services.
- [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.

JSON: [/v1/bulletins/10187745](/v1/bulletins/10187745)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%2018NA073&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F10187745&vehicle=Service%20bulletin%2018NA073)