TSB200116-051420

5/28/2020
Cold Weather Fault Codes
Technical Service Bulletin
Technical Service Bulletin: TSB200116
Cold Weather Fault Codes
Released Date: 14-May-2020
Cold Weather Fault Codes
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
B6.7 CM2350 B121B
L9 CM2350 L116B
Issue
Symptom:
Units experiencing the fault codes below while operating at lower ambient air temperatures
0°C [ 32°F ] either one or multiple fault codes may be present. Root cause of malfunction is
not found during other steps of the trouble shooting tree.
Fault Codes: 4729, 7233, 1866, 1228, 125, 153, 3361, 691, 742, 3542, 1896, 3382, 3389,
7232
Root Cause:
Units that have been exposed to lower ambient air temperatures without a Cummins®
approved winter front, will be more prone to creating icing or condensation in the components
mentioned below.
Components in the EGR and air handling system have been identified to be prone to having
have icing, condensation or residue.
Air Handling System (charge air cooler, intake air throttle, air intake piping, intake
manifold pressure)
EGR System (EGR differential pressure sensor, EGR valve, EGR crossover pipe).
Verification
Verify that unit has been operating in lower ambient air temperatures less than or equal to 0°C
[ 32°F ] from fault code snapshot in INSITE™ electronic service tool.
https://quickserve.cummins.com/qs3/pubsys2/xml/en/tsb/2020/tsb200116.html
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Cold Weather Fault Codes
Note that ice and condensation may not be present during trouble shooting and maintenance
operations due to higher temperatures in the service location. In most cases fault code status
may become inactive, indicating this malfunction.
Resolution
Inspect and clean any component that have icing, condensation, or residue on EGR and Air
Handling components.
If no trouble is found and the engine has been operating in sub-freezing temperature, direct
the customer to the Operation of Diesel Engines in Cold Climates, Service Bulletin 3379009
(/qs3/pubsys2/xml/en/bulletin/3379009.html). A winter front is recommended to reduce
occurrences of this malfunction. A winter front will assist in reducing the time to increase the
engine compartment temperatures. Operating with a winter front will reduce ice buildup prior
to operation of EGR system and engine intake throttle actuator.
Reference Radiator Shutter Assembly Procedure for guidelines on winter fronts. See
corresponding Service Manual. Reference Procedure 008-049 in Section 8.
Document History
Date
Details
2020-5-13
Module Created
2020-5-14
Fixed hyperlink.
Last Modified: 14-May-2020
https://quickserve.cummins.com/qs3/pubsys2/xml/en/tsb/2020/tsb200116.html
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