# Service bulletin 18NA026

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: 10171885
- Published by NHTSA: 2020\-03\-02
- Manufacturer's number: 18NA026
- Manufacturer's date: 2020\-01\-22
- NHTSA component: FUEL SYSTEM, GASOLINE; POWER TRAIN; EQUIPMENT ADAPTIVE/MOBILITY

## NHTSA's summary

This technical bulletin provides a procedure to install an oil cooler line fitting seal, including applying medium strength threadlocker \(blue\) to the retaining bolt to stop transmission fluid leaking from the transmission oil cooler line retaining bolt passage.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10171885-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10171885-9999.pdf)

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

## Components

Equipment and accessories, Fuel system, Transmission and driveline

## Vehicles listed

- 2018 CADILLAC ESCALADE
- 2018 CADILLAC ESCALADE ESV
- 2017 to 2018 CHEVROLET CAMARO
- 2019 CHEVROLET SILVERADO 1500
- 2018 CHEVROLET TAHOE
- 2019 GMC SIERRA 1500
- 2018 GMC YUKON
- 2018 GMC YUKON XL

## Recalls for the same vehicles and component

- [26V289000](/recalls/nhtsa/26V289000.md), 2026-05-07: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\)
- [23V047000](/recalls/nhtsa/23V047000.md), 2023-02-02: FUEL SYSTEM, DIESEL:STORAGE:TANK ASSEMBLY
- [2022160](/recalls/tc/2022160.md), 2022-03-31: Accessories
- [21V496000](/recalls/nhtsa/21V496000.md), 2021-07-01: EQUIPMENT:ELECTRICAL:ENGINE BLOCK HEATER
- [2020505](/recalls/tc/2020505.md), 2020-10-23: Powertrain
- [20V650000](/recalls/nhtsa/20V650000.md), 2020-10-22: POWER TRAIN:DRIVELINE:DRIVESHAFT
- [2020165](/recalls/tc/2020165.md), 2020-04-16: Accessories
- [2019494](/recalls/tc/2019494.md), 2019-10-03: Accessories
- [2019205](/recalls/tc/2019205.md), 2019-04-26: Accessories

## Other bulletins for the same vehicles and component

- [PI0281L](/bulletins/11019516.md), 2025-06-12, Service bulletin: STEERING; POWER TRAIN; SUSPENSION. This preliminary informational \(PI\) bulletin provides information to dealership personnel that may be helpful when addressing underbody component corrosion with customers.
- [23\-NA\-185](/bulletins/11017255.md), 2025-04-28, Service bulletin: POWER TRAIN; ELECTRICAL SYSTEM; STEERING. This service bulletin helps diagnose/reduce possible CCND issues on Transfer Cases \- Service 4WD on DIC, Intermittent Failures, Noise Concerns, Driveline/Steering Vibration/Shudder, Intermittent DTCs/MIL Illuminated, Engagement/Disengagement/Ratcheting Concerns.
- [25\-NA\-065](/bulletins/11017173.md), 2025-04-24, Service bulletin: STEERING; SERVICE BRAKES; FUEL/PROPULSION SYSTEM. This informational bulletin instructs the tech when fuel/fluid is needed to be tested and where it can be sent for analysis.
- [PIP5966A](/bulletins/11014622.md), 2025-03-02, Service bulletin: POWER TRAIN. This Preliminary information communicates Diagnostic aids for a no start or DTC'S following a transmission replacement
- [PIP5966A](/bulletins/11014621.md), 2025-03-02, Service bulletin: POWER TRAIN. This Preliminary information communicates Diagnostic aids for a no start or DTC'S following a transmission replacement
- [16\-NA\-019](/bulletins/11014353.md), 2025-02-19, Service bulletin: POWER TRAIN. This service bulletin provides information on Transmission Adaptive Functions and Correcting Low Mileage Harsh Shifts, Slips, or Flares.
- [PIP5175F](/bulletins/11014044.md), 2025-02-10, Service bulletin: POWER TRAIN. This Preliminary Information communication provides information to the technician about vehicles that may have a delayed engagement into drive, shudder at a launch, or the transmission is slipping when shifting into 1st, 2nd, 3rd or 4th gears. This may be due to loose stator support to pump cover bolts causing a leak at the stator support to pump cover gasket. Technician will check for the bolts to be loose. If any of the bolts are loose or the gasket is misaligned or leaking, the transmission pump cover must be replaced and the 1234 clutch plates should be inspected for being distressed and repaired as needed.
- [09\-06\-04\-026Z](/bulletins/11013069.md), 2025-01-23, Service bulletin: ENGINE; POWER TRAIN; ELECTRICAL SYSTEM. This bulletin provides information on identifying Non\-GM Engine Calibrations for Gasoline Engines using the Tech 2 or GDS 2.
- [PIC6454A](/bulletins/11012951.md), 2025-01-20, Service bulletin: POWER TRAIN. This Preliminary Information communicates additional information to the customer on the "No Lift Shift" feature found on all Manual Transmission equipped Camaros.
- [08\-07\-30\-035I](/bulletins/11011989.md), 2024-12-19, Service bulletin: POWER TRAIN. This service bulletin provides information on the harmful effects of ethylene glycol in transmission fluid.

JSON: [/v1/bulletins/10171885](/v1/bulletins/10171885)

[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%2018NA026&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F10171885&vehicle=Service%20bulletin%2018NA026)