# Service bulletin 20NA166

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: 10212560
- Published by NHTSA: 2022\-05\-31
- Manufacturer's number: 20NA166
- Manufacturer's date: 2021\-12\-09
- NHTSA component: ENGINE AND ENGINE COOLING; ENGINE AND ENGINE COOLING:COOLING SYSTEM:HOSES/LINES/PIPING/FITTINGS

## NHTSA's summary

This informational bulletin advises the technician of possible coolant entering the areas of the engine, either through failed parts or defects in the castings, that may be the cause of the concerns related to the MIL or the engine running rough.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10212560-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10212560-9999.pdf)

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

## Components

Engine, Cooling system

## Vehicles listed

- 2016 to 2019 CADILLAC CTS
- 2015 to 2020 CADILLAC ESCALADE
- 2022 CADILLAC ESCALADE
- 2015 to 2016 CADILLAC ESCALADE ESV
- 2017 to 2022 CADILLAC ESCALADE ESV
- 2021 CADILLAC ESCALADE NA
- 2016 to 2022 CHEVROLET CAMARO
- 2016 to 2019 CHEVROLET CORVETTE
- 2014 CHEVROLET SILVERADO 1500
- 2017 to 2022 CHEVROLET SILVERADO 1500
- 2015 to 2019 CHEVROLET SILVERADO 2500
- 2019 CHEVROLET SILVERADO 4500
- 2015 to 2022 CHEVROLET SUBURBAN
- 2015 to 2022 CHEVROLET TAHOE
- 2014 GMC SIERRA 1500
- 2019 to 2022 GMC SIERRA 1500
- 2015 to 2018 GMC SIERRA 2500
- 2015 to 2019 GMC SIERRA DENALI
- 2015 to 2022 GMC YUKON
- 2015 to 2022 GMC YUKON XL

## Other bulletins for the same vehicles and component

- [PIE0283](/bulletins/10252886.md), 2024-04-08, Service bulletin: ENGINE AND ENGINE COOLING:COOLING SYSTEM. Engineering Information.
- [16NA006](/bulletins/10246549.md), 2023-12-11, Service bulletin: ENGINE AND ENGINE COOLING:COOLING SYSTEM:RADIATOR ASSEMBLY. Coolant Leak Originating from Radiator Hose Clamp or Lower Water Pump Inlet Pipe
- [22NA013](/bulletins/10212629.md), 2022-05-31, Service bulletin: ENGINE AND ENGINE COOLING:COOLING SYSTEM. This technical bulletin provides a procedure for the technician to check and tighten the CAC plumbing if found loose.
- [21NA237](/bulletins/10207914.md), 2022-02-14, Service bulletin: UNKNOWN OR OTHER; ENGINE AND ENGINE COOLING:COOLING SYSTEM. THis technical bulletin provides a procedure to perform a cooling system flush to remove possible debris from the cooling system pipes.
- [21NA257](/bulletins/10205577.md), 2021-12-27, Service bulletin: ENGINE AND ENGINE COOLING:COOLING SYSTEM; EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT. This service bulletin provides a service procedure to correct a customer concern of a Malfunction Indicator Lamp \(MIL\) Illuminated \- DTC P3075 Set.
- [21NA237](/bulletins/10205563.md), 2021-12-27, Service bulletin: EQUIPMENT; ENGINE AND ENGINE COOLING:COOLING SYSTEM:HOSES/LINES/PIPING/FITTINGS. THis technical bulletin provides a procedure to perform a cooling system flush to remove possible debris from the cooling system pipes.
- [N202302720](/bulletins/10186053.md), 2021-02-01, Service bulletin: POWER TRAIN; ENGINE AND ENGINE COOLING:COOLING SYSTEM:RADIATOR ASSEMBLY; EQUIPMENT. Special Coverage. Certain vehicles may have a condition where the vehicle may overheat and enter a reduced power mode when driven on a track at sustained high speeds in high ambient temperatures. Dealers are to install an updated radiator package and, for automatic transmission vehicles, updated shift\-point calibration software. The repairs will be made at no charge to the customer. The customer must provide evidence of an overheating condition in the form of one of the following: Diagnostic Trouble Code, photos, or videos. The dealer should make a copy of any customer evidence provided and file with the warranty claim.
- [18NA103](/bulletins/10183153.md), 2020-11-30, Service bulletin: FUEL SYSTEM, GASOLINE; ENGINE AND ENGINE COOLING:COOLING SYSTEM:PUMP. This service bulletin provides information to correct a customer concern of an in\-tank fuel pump whining noise, engine hard to start and/or stalls and Malfunction Indicator Lamp \(MIL\) is illuminated.
- [PIT5789](/bulletins/10182582.md), 2020-11-16, Service bulletin: ENGINE AND ENGINE COOLING:COOLING SYSTEM:PUMP; ELECTRICAL SYSTEM:SOFTWARE. This Preliminary information communicates an issues with an SES MIL and DTC P2B87 setting. Engineering is working on releasing updated BCM cals to correct the concern.
- [PIP5684B](/bulletins/10178370.md), 2020-08-10, Service bulletin: ENGINE; ENGINE AND ENGINE COOLING:COOLING SYSTEM; EQUIPMENT. This Preliminary information communicates the use of air leak diagnostic test tool CH\-52250 in addition to the information found in the service manual.

JSON: [/v1/bulletins/10212560](/v1/bulletins/10212560)

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