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Service bulletin TechTalk8134

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10189971
Published by NHTSA2021-04-06
Manufacturer's numberTechTalk8134
Manufacturer's date2021-03-09
NHTSA componentPOWER TRAIN:AUTOMATIC TRANSMISSION; ENGINE AND ENGINE COOLING

NHTSA's summary

Tech Talk continuing discussion on SCR conversion codes only when bobtailing.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Engine, Transmission and driveline, Automatic transmission

Vehicles listed
FREIGHTLINER CASCADIA2020

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
19V1370002019-02-27. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; POWER TRAIN:AUTOMATIC TRANSMISSION:GEAR POSITION INDICATION (PRNDL)

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
20TS-072020-10-21. Service bulletin. Technical Service Letter for Cold Weather Faults on GHG17/21 DD13 with MCM Software Version 14. Due to colder weather, there may be an increase in the frequency of faults, noted below, on GHG17/21 DD13 trucks built after June 5th 2019. This is due to a calibration issue in the current MCM software (14.1.1.5 or 14.2.1.3). New software is scheduled for release in the first quarter of 2021 that will address these faults.
sb2652 DT12 PTO2019-04-08. Service bulletin. DT12 PTO Upfit
DOC-10341662019-04-08. Service bulletin. SS 1034166 New Cacadia With Cummins Engine and Eaton UltraShift PTO Engagement