TSB200116-030220

3/25/2021
Cold Weather Fault Codes
Technical Service Bulletin
Technical Service Bulletin: TSB200116
Cold Weather Fault Codes
Released Date: 02-Mar-2021
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
B6.7 CM2450 B155B
L9 CM2350 L116B
L9 CM2450 L126B
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.
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Cold Weather Fault Codes
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.
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.
2021-3-1
Added B6.7 CM2450 B155B and L9 CM2450 L126B
Last Modified: 02-Mar-2021
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Cold Weather Fault Codes
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