TSB200068-032420

3/31/2020
Fault Code 2989 at High Engine RPM
Technical Service Bulletin
Technical Service Bulletin: TSB200068
Fault Code 2989 at High Engine RPM
Released Date: 24-Mar-2020
Fault Code 2989 at High Engine RPM
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
L9N CM2380 L124B
L9N CM2380 L130B
Issue
Symptom:
Fault Code 2989 comes active during vehicle operation.
Reduced engine power.
Troubleshooting is unable to identify the cause.
Root Cause:
At certain combinations of engine speed and load, the engine ECM calibration is temporarily
unable to supply desired airflow to the engine.
Verification
Installations which utilize high final drive ratios and operate at high vehicle speed will result in the
engine operating at or near its governed RPM limit. Under these conditions, the rapid onset of a
load, such as an increasing grade may cause faul code 2989 to become active.
Resolution
1. The best solution is to change the vehicle final gear ratio to better conform to the conditions
under which it will be used, however it is understood that this is not always feasible.
2. Compare the engine control module (ECM) code and revision number to calibration revisions
listed in the ECM Calibration Revision History on QSOL for applicable changes related to this
issue.
Description of Change
https://quickserve.cummins.com/qs3/pubsys2/xml/en/tsb/2020/tsb200068.html
1/3
3/31/2020
Fault Code 2989 at High Engine RPM
A revised engine calibration exists which accommodates operation of the engine at extended high
RPM and increasing load.
Customer Communication
A revised engine calibration exists which accommodates operation of the engine at high RPM and
increasing load.
If extended operation at speeds which result in maximum engine RPM are expected, it is
recommended that the vehicle final gear ratio be changed to reduce engine RPM at those speeds.
A local Cummins® Distributor can provide guidance to optimize engine economy, efficiency, and
performance.
Service Instructions
Normal troubleshooting should always be performed to make sure that the fault code is not based
on a mechanical or sensor issue.
Upon completion of the calibration update, test drive the vehicle in the conditions under which the
fault code was logged to confirm that the issue is resolved.
Service Parts Availability
An updated ECM calibration is available for Service. Use calibrations with revision date 13
February 2020 or later.
Service Tools and Training Available
The Cummins® recommended electronic service tool or equivalent is required to update the
engine ECM calibration.
Production Status
Implemented for production. See Table 1.
Table 1, Production Information
ESN First
Build Date1
Plant
74641758
02 March 2020
RMEP
1Engine
build date can be found on the engine dataplate.
Table 2, Publications Affected
Manual Type
Engine
Bulletin
Number
https://quickserve.cummins.com/qs3/pubsys2/xml/en/tsb/2020/tsb200068.html
Procedure
Title
Procedure
Section
2/3
3/31/2020
Fault Code 2989 at High Engine RPM
Table 2, Publications Affected
Manual Type
Fault Code
Troubleshoot
ing Manual
Engine
L9N CM2380
L124B
L9N CM2380
L130B
Bulletin
Number
Procedure
Title
Procedure
Section
5467495
Engine
Intake Air
Mass Flow Data Valid
But Below
Normal
Operating
Range Moderately
Severe Level
52-fc2989
TF
Document History
Date
2020-3-20
Details
Module Created
Last Modified: 24-Mar-2020
https://quickserve.cummins.com/qs3/pubsys2/xml/en/tsb/2020/tsb200068.html
3/3