# Service bulletin 99\-034

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: 10136230
- Published by NHTSA: 2018\-05\-07
- Manufacturer's number: 99\-034
- Manufacturer's date: 2018\-03\-08
- NHTSA component: ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL

## NHTSA's summary

Information Only \- CECU/VECU unable to communicate with ESA requires use of a Y\-cable.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2018/MC-10136230-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2018/MC-10136230-0001.pdf)

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

## Components

Electrical system, Equipment and accessories, Software

## Vehicles listed

- 2018 KENWORTH T680
- 2018 KENWORTH T800
- PACCAR PETERBILT

## Other bulletins for the same vehicles and component

- [26\-037](/bulletins/10185190.md), 2021-01-06, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN; EQUIPMENT ADAPTIVE/MOBILITY. Fix\-As\-Fail \- Prior versions of Eaton Endurant transmission software may be prone to setting Linear Clutch Actuator \(LCA\) fault codes leading to possible LCA hardware replacement.
- [T010](/bulletins/10185188.md), 2021-01-06, Service bulletin: EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT; ELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN. Non\-Safety Campaign – Vehicles with PACCAR transmissions may experience transmission service lamp activation, no gear engagement from neutral, and/or DTC 511 FMI 7 or 10 is set. Transmission software and shift calibration updates are available to resolve
- [03\-071](/bulletins/10169787.md), 2020-01-04, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE. Information Only \- Vehicles built with NAMUX software from 2013 to present may experience accuracy issues with the tachometer. The issue can be temporarily resolved using any one of the included procedures.

JSON: [/v1/bulletins/10136230](/v1/bulletins/10136230)

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