TSB210106-051820

Service Bulletin Details

Public Details for: TSB210106-051820

This technical service bulletin describes the verification and resolution of intermittent datalink fault codes for aftertreatment, turbocharger, or certain chassis systems in freightliner chassis equipped with an allison transmission. Thi


- 9999 -

Models from 9999
9999 CUMMINS B6.7
9999 CUMMINS L9N 
6/1/2021
Datalink Fault Codes Caused by Wiring Harness Chaffing In Freightliner® Chassis
Technical Service Bulletin
Technical Service Bulletin: TSB210106
Released Date: 18-May-2021
Datalink Fault Codes Caused by Wiring Harness Chaffing In Freightliner® Chassis
Datalink Fault Codes Caused by Wiring Harness Chaffing In
Freightliner® Chassis
Warranty Statement
The information in this document has no effect on present warranty coverage or repair practices, nor does it authorize TRP or
Campaign actions.
Information Only - OEM Related Matter Not Covered By Cummins® - Contact Appropriate OEM Dealer or OEM Representative For
Additional Information
Contents
Product Affected
B6.7 CM2350 B121B
B6.7 CM2450 B155B
L9 CM2350 L119B
L9 CM2450 L126B
Issue
Symptom:
Intermittent datalink fault codes for aftertreatment, turbocharger, or certain chassis systems in Freightliner® chassis equipped
with an Allison® transmission.
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Datalink Fault Codes Caused by Wiring Harness Chaffing In Freightliner® Chassis
Fault code examples are: 427, 1894, 2636, 2771, 3232, 3326, 3328, 3488, 3526, 3868, 4151, 4152, 4572, 4677, 5177,
and/or 6688
Unit can also exhibit shift quality issues and gear limitation,
Unit can exhibit dash dropout issues with speedometer, tachometer or diesel exhaust fluid gauge. Fuel level and air pressure
will not be affected.
Completion of troubleshooting tree for associated fault code may not find a root cause of malfunction.
Root Cause:
The original equipment manufacturer (OEM) wiring harness routing near the transmission can rub on the lifting pads for the
transmission causing the malfunction and associated datalink faults. There are two locations that can rub. The harness along
driver side of transmission, and DEF wiring harness along passenger side of transmission
Verification
Verify unit is Freightliner® chassis with an Allison® Transmission.
Verify build date of truck. Only units built prior to 30 November 2020 have this issue.
Verify the unit has fault codes listed above.
Verify the unit exhibits shift quality issues and gear limitation.
Inspect the OEM wiring harness near the transmission lifting pads/brackets and around any sharp edges for signs of chaffing or
rubbing to the wiring harness.
Resolution
If chaffing or damage to the wiring harness is found reference Freightliner® Service Bulletin 54-328.
Document History
Date
2021-5-13
Details
Module Created
Last Modified: 18-May-2021
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Datalink Fault Codes Caused by Wiring Harness Chaffing In Freightliner® Chassis
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