DTNA received a field notification on multiple units regarding diagnostic fault codes that were found to...
Freightliner technical service bulletin DT12 Trans Chafe for 2014-2022 Freightliner Cascadia, 2014-2021 Western Star 4900 and 2014-2022 Western Star 5700 and others.
- Bulletin number
- DT12 Trans Chafe
- Component
- Power train
- Summary
- DTNA received a field notification on multiple units regarding diagnostic fault codes that were found to be causing issues to the After Treatment Control Module (ACM). These fault codes indicated that the ACM communication message was not received by the Motor Control Module (MCM) which in certain cases, led to a 25% engine de-rate situation. Further diagnosis revealed that the DT12 wiring harness was chafing and contacting the transmission TCU case. To reduce potential chafing areas, the proposed short-term containment was to route the wiring harness using additional tie straps. This communication applies to Freightliner and Western Star vehicles built with DT12 transmissions.
Owners of these vehicles have filed 2 complaints in the transmission category.
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