TSB180025

3/1/22, 10:56 AM
Damaged Coolant Thermostat Identified by Fault Codes: 146, 151, 1962, 2646, and 2963
Technical Service Bulletin
Technical Service Bulletin: TSB180025
Released Date: 10-Feb-2022
Damaged Coolant Thermostat Identified by Fault Codes: 146, 151, 1962, 2646, and
2963
Damaged Coolant Thermostat Identified by Fault
Codes: 146, 151, 1962, 2646, and 2963
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.
Contents
Product Affected
ISL9 CM2250
ISL9 CM2350 L101
L9 CM2350 L116B
L9 CM2350 L119B
L9 CM2350 L123B
Issue
Symptom:
Fault Codes
146
151
1962
2646
2963
Improper function of coolant thermostat.
Excessive coolant temperature.
Engine unable to reach operating temperature.
Root Cause:
Fatigue malfunction caused by internal pressure.
Verification
https://quickserve.cummins.com/qs3/pubsys2/xml/en/tsb/2018/tsb180025.html
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3/1/22, 10:56 AM
Damaged Coolant Thermostat Identified by Fault Codes: 146, 151, 1962, 2646, and 2963
Inspect coolant thermostat for damage. See Figure 1.
Figure 1, Coolant Thermostat with Scuffing and Cracks.
Resolution
Replace coolant thermostat with the new part number in Table 1 below. Reference Procedure 008013 in the corresponding Service Manual.
Service Parts Availability
Service parts are available. See Table 1 for part numbers.
Table 1, Service Parts
Part
Description
Existing Part
Number
Obsolete
Superseded
New Part
Number
Coolant
Thermostat
5273379
No
No
5478594
Document History
Date
2018-2-27
Details
Module Created
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3/1/22, 10:56 AM
Damaged Coolant Thermostat Identified by Fault Codes: 146, 151, 1962, 2646, and 2963
Date
Details
2018-9-18
Non-Product Problem Solving (PPS)
2020-2-10
Corrected broken procedure reference to 008-013. Edited the
reference to be general since there are multiple projects listed in TSB
180025.
2022-2-9
Added L9 CM2350 L119B
Last Modified: 10-Feb-2022
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