NHTSA ID Number: 11028353
Manufacturer Communication Number: IK0800684
TSB/Document Date: 2026-02-05
Summary
This document is to inform dealers, customers, and body builders/TEMs of a known BCM software issue with kernels 747 through 752. Units built after November of 2024 as well as older units that were updated with DLB between 11/5/2024 and 6/26/2025 with Remote Power Modules (RPM) modules, can experience loss of RPM functionality as well as other electrical system concerns. Kernel 753 was released to DLB on 6/26/2025 to address these concerns.
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ISIS, Bus ISIS, FleetISIS, Body Builder,
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Document ID: IK0800684
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1
Electrical
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Last
Modified:
6/26/2025
Author:
Sean
McGannon
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1/29/2026
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Title : Erratic BCM and RPM Behavior with Kernel 747-752
Applies To : All MV, HV, HX with RPM modules
CHANGE LOG
Please refer to the change log text box below for recent changes to this article:
01/29/2026 - Added note for issue with kernel 756
06/27/2025 - Initial Article Release
DESCRIPTION
This document is to inform dealers, customers, and body builders/TEMs of a known BCM software issue with kernels 747 through 752. Units built
after November of 2024 as well as older units that were updated with DLB between 11/5/2024 and 6/26/2025 with Remote Power Modules (RPM)
modules, can experience loss of RPM functionality as well as other electrical system concerns. Kernel 753 was released to DLB on 6/26/2025 to
address these concerns.
Note: as of 1/26/26 we are aware of the same issue on kernel 756 that DLB is currently updating
BCMs to. Kernel 757 is expected to be available in DLB by 2/6/26. Do not update BCMs on
vehicles with RPM modules until that is available. If you have already updated to 756, revert the
BCM to an older configuration or start a programming case file for assistance with installing a
different kernel.
SYMPTOM(s)
Diagnostic Trouble Code(s) & Dashboard Indicator Light(s):
SPN
FMI
Fault Description
520469
14
RPM 1 Channel 1 Analog Input Data Unavailable
520471
14
RPM 1 Channel 2 Analog Input Data Unavailable
520473
14
RPM 1 Channel 3 Analog Input Data Unavailable
520475
14
RPM 1 Channel 4 Analog Input Data Unavailable
520477
14
RPM 1 Channel 5 Analog Input Data Unavailable
520479
14
RPM 1 Channel 6 Analog Input Data Unavailable
520481
14
RPM 2 Channel 1 Analog Input Data Unavailable
520483
14
RPM 2 Channel 2 Analog Input Data Unavailable
520485
14
RPM 2 Channel 3 Analog Input Data Unavailable
520487
14
RPM 2 Channel 4 Analog Input Data Unavailable
520489
14
RPM 2 Channel 5 Analog Input Data Unavailable
520491
14
RPM 2 Channel 6 Analog Input Data Unavailable
520493
14
RPM 3 Channel 1 Analog Input Data Unavailable
520495
14
RPM 3 Channel 2 Analog Input Data Unavailable
520497
14
RPM 3 Channel 3 Analog Input Data Unavailable
520499
14
RPM 3 Channel 4 Analog Input Data Unavailable
520501
14
RPM 3 Channel 5 Analog Input Data Unavailable
520503
14
RPM 3 Channel 6 Analog Input Data Unavailable
520505
14
RPM 4 Channel 1 Analog Input Data Unavailable
520507
14
RPM 4 Channel 2 Analog Input Data Unavailable
520509
14
RPM 4 Channel 3 Analog Input Data Unavailable
520511
14
RPM 4 Channel 4 Analog Input Data Unavailable
520513
14
RPM 4 Channel 5 Analog Input Data Unavailable
520515
14
RPM 4 Channel 6 Analog Input Data Unavailable
520517
14
RPM 5 Channel 1 Analog Input Data Unavailable
520519
14
RPM 5 Channel 2 Analog Input Data Unavailable
520521
14
RPM 5 Channel 3 Analog Input Data Unavailable
520523
14
RPM 5 Channel 4 Analog Input Data Unavailable
520525
14
RPM 5 Channel 5 Analog Input Data Unavailable
520527
14
RPM 5 Channel 6 Analog Input Data Unavailable
520529
14
RPM 6 Channel 1 Analog Input Data Unavailable
520531
14
RPM 6 Channel 2 Analog Input Data Unavailable
520533
14
RPM 6 Channel 3 Analog Input Data Unavailable
520535
14
RPM 6 Channel 4 Analog Input Data Unavailable
520537
14
RPM 6 Channel 5 Analog Input Data Unavailable
520539
14
RPM 6 Channel 6 Analog Input Data Unavailable
520541
14
RPM 7 Channel 1 Analog Input Data Unavailable
520543
14
RPM 7 Channel 2 Analog Input Data Unavailable
520545
14
RPM 7 Channel 3 Analog Input Data Unavailable
520547
14
RPM 7 Channel 4 Analog Input Data Unavailable
520549
14
RPM 7 Channel 5 Analog Input Data Unavailable
520551
14
RPM 7 Channel 6 Analog Input Data Unavailable
Customer Observations or Concerns:
All inputs and outputs through RPM modules do not function
Switches or indicator lights tied to RPM inputs or outputs can fast flash red
Dome/panel/marker lights flashing
Windshield wipers turning on without command
Warning lights in the cluster after adjusting the rear HVAC settings
Rear HVAC fan and temp display showing erratically in the cluster
Relays clicking/cycling in the cab and sleeper PDM
SPECIAL TOOLS / SOFTWARE
Tool Description
Tool Number
Diamond Logic® Builder
Comments
Instructions
EZ-Tech Software
REPAIR STEP(s)
1. Connect to the vehicle with DLB software with the ignition key on.
NOTE: DLB will automatically download the latest kernel when launching. It is recommended to restart DLB with an internet connection before
starting programming.
2. With the correct VIN selected, hit the update all button (Figure 1, Item 1).
Figure 1: DLB Select Tab
Item 1: Update All Button
3. Verify the selected kernel shows as 753 or later (Figure 2, Item 1), then hit the program button (Figure 2, Item 2).
Figure 2: Preparing for Programming
Item 1: Selected Kernel Version
Item 2: Program Button
4. After programming is complete, verify the detected BCM version matches the selected and shows kernel 753 or later (Figure 3, Item 1).
Figure 3: After Programming
Item 1: Detected Kernel currently programmed to
BCM
5. Verify the function of the truck and return to service.
WARRANTY INFORMATION
Warranty Claim Coding:
Refer to the Warranty Coding Manual for Group and Noun Codes.
Standard Repair Time(s):
Refer to the SRT Manual for Repair Times
OTHER RESOURCES
Master Service Information Site
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Copyright © 2026 Navistar
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TSB/Document ID: IK0800684
Replacement Service Bulletin Number:
MFR Communication Date: 2026-01-29
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
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