# Service bulletin 26\-029

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: 10125013
- Published by NHTSA: 2017\-12\-08
- Manufacturer's number: 26\-029
- Manufacturer's date: 2017\-11\-21
- NHTSA component: ELECTRICAL SYSTEM

## NHTSA's summary

Fix\-As\-Fail \- A U1548 fault code is present in the DAVIE log file, with no fault lamp illuminated or other obvious symptoms.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2017/MC-10125013-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2017/MC-10125013-0001.pdf)

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

## Components

Electrical system

## Trouble codes named

U1548

## Vehicles listed

- 2015 to 2016 KENWORTH T680
- 2015 to 2016 KENWORTH T800
- 2015 to 2016 KENWORTH T880
- 2015 to 2016 KENWORTH W900

## Recalls for the same vehicles and component

- [21V00N000](/recalls/nhtsa/21V00N000.md), 2021-12-29: ELECTRICAL SYSTEM:WIRING
- [2017374](/recalls/tc/2017374.md), 2017-07-27: Electrical
- [17V471000](/recalls/nhtsa/17V471000.md), 2017-07-25: ELECTRICAL SYSTEM:WIRING:FUSES AND CIRCUIT BREAKERS; EXTERIOR LIGHTING
- [15V597000](/recalls/nhtsa/15V597000.md), 2015-09-24: ELECTRICAL SYSTEM:IGNITION:MODULE; ENGINE AND ENGINE COOLING:ENGINE
- [2015190](/recalls/tc/2015190.md), 2015-05-08: Electrical
- [2015189](/recalls/tc/2015189.md), 2015-05-08: Electrical
- [15V270000](/recalls/nhtsa/15V270000.md), 2015-05-08: ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR

## Other bulletins for the same vehicles and component

- [E324](/bulletins/11035148.md), 2026-07-22, Service bulletin: ELECTRICAL SYSTEM. The campaign expiration date has been changed to 03/01/2027.
- [02\-177](/bulletins/11033351.md), 2026-06-03, Service bulletin: ELECTRICAL SYSTEM. Troubleshooting procedures for 2.1m cab power windows are now available.
- [32\-017](/bulletins/10188467.md), 2021-03-10, Service bulletin: ELECTRICAL SYSTEM. Non\-Safety Campaign – The batteries may drain quickly due to the VECU not going to sleep. Updated VECU software is available to resolve the issue.
- [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.
- [32\-015](/bulletins/10177021.md), 2020-07-03, Service bulletin: ELECTRICAL SYSTEM. Information Only: This bulletin provides dealers with a battery warranty quick reference guide to ensure the appropriate tests for battery warranty are performed in order to prevent battery warranty claims filed with incorrect or incomplete information.
- [34\-085](/bulletins/10173212.md), 2020-04-03, Service bulletin: VEHICLE SPEED CONTROL; ELECTRICAL SYSTEM. Information Only – Vehicles may have the connector seals on the wheel speed sensor incorrectly installed, which may lead to water intrusion and corrosion in some vehicles.
- [32\-013](/bulletins/10171030.md), 2020-02-05, Service bulletin: ELECTRICAL SYSTEM. Information Only: The AutoStart System Test does not recognize the hood opening and closing when running the test on a model 579 or 567 chassis equipped with a VECU software version 9.8 and 9.9. The issue will be fixed on a future VECU software update. This bulletin will be updated when the resolution is available.
- [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.
- [43\-063](/bulletins/10169706.md), 2020-01-04, Service bulletin: ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. Emissions Campaign – The Engine Overspeed lamp may illuminate during a smoke opacity test. A software update is available to resolve the issue.
- [03\-070](/bulletins/10161168.md), 2019-06-11, Service bulletin: ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT ADAPTIVE/MOBILITY. Fix as Fail: Vehicles built 11/30/15 to 7/18/16 may display an error message in the Service Advised display after updating CECU software.

JSON: [/v1/bulletins/10125013](/v1/bulletins/10125013)

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