43-080: DEF Lamp Operation
6/2/2026

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43-080

DEF Lamp Operation

Section
Inlet/Exhaust/Aftertreatment - 43

Subject
DEF Lamp Operation

Whats New Abstract
A new recommended repair has been added to verify the software level and close the campaign in SIR.
The repair procedure has been updated with additional note boxes for clear instructions.

Revision
06/02/2026: A new recommended repair has been added to verify the software level and close the
campaign in SIR. The repair procedure has been updated with additional note boxes for clear
instructions.
03/25/2025: The bulletin is active again. The repair procedure has been updated, the chassis list has
been updated, and software updates are available.
12/13/2024: This bulletin was temporarily suspended.

Condition
The Diesel Exhaust Fluid (DEF) lamp, in certain instances, may not flash, may not illuminate red and can
be delayed by 30 seconds. This issue may cause inaccurate digital gauge notifications of the DEF
system and may cause the Check Engine Lamp to illuminate. Normally the DEF lamp would be

illuminated solid white when there are no issues with the DEF system and illuminate solid red or flashing
red when there are issues with the DEF system.

Chassis Affected
71,240 (62,783 US and 8,457 Canada) model year 2021 – 2025 T180/T280/T380/T480/T680/T880/W990
chassis built from 06/15/2020 through 01/15/2024 equipped with a 7" or 15" Digital Display and VMUX
22.5/23 software.

Action
CAMPAIGN
Service all chassis affected that enter your dealership, even if the customer has no issue with the
chassis.
1. Review the attached chassis list for your dealer code and schedule your customer(s) for service if
their chassis is on the list.
2. In Service Management, select Campaign 43080 to add it to the case. If the unit is released back
into service without performing the repair, make sure to also release the Campaign in Service
Management.
3. If you are not using Service Management to start repair orders, review SIR for “Complete” next to
the 43080 Campaign code prior to performing this repair.
4. Follow procedures to update the VECU and/or Digital Display software.

Warranty
Kenworth Warranty Statement
There is no time or mileage limit for this campaign Kenworth will pay for labor:
0.5 hours of labor to process a PVP file and program software to both Digital Display and VECU
using DAVIE4. Select Recommended Repair Code 43080A
0.4 hours of labor to process a PVP file and verify software level in Digital Display and VECU.
Update Digital Display software only (if VECU is found to be at the most current software level).
Select Recommended Repair Code 43080B
0.3 hours of labor to process a file through PVP, verify software level in Digital Display and VECU.
(Both Digital Display and VECU are found to be at the most current software level). Select
Recommended Repair Code 43080C.
File an additional claim for extraordinary circumstances. A recommended repair for standard labor

must be filed first.
File the claim within 14 days in accordance with Warranty Policy CA009.

PRWS CLAIM CODING
Campaign 43080
Code:

Campaign
Type

Field Repair

Claim
Truck
Category:

Repair Type

Proactive

Customer 029 - Does Not
Concern Operate Properly
Code

Causal Code 95- Requires Program
Update

Corrective 23 - Program /
Responsibility Camp
Action
Reprogram/Reflash Code:
Code
Failure
Location

003-006-001

Causal Part

Supplier
Code

N/A

SRT Code

ASA122021647601809

B23-20A
0.5 Hours
Process PVP file and
program Digital Display
and VECU
B23-20B
0.4 Hours
Process PVP file and
program Digital Display
only. VECU already
Current
B23-20C
0.3 hours
Bulletin 043-080 - DEF
lamp behavior per
bulletin procedure.
process through PVP
and verify software
level is current for

Digital Display and
VECU

Parts
Software only, no parts necessary.
Take off parts disposition: N/A

Procedure

WARNING!
Repair or maintenance
procedures may pose a
safety risk in limited
circumstances. You must
read all procedure steps
before performing any work
and follow all dealership
safety procedures or
precautions. Failure to
comply may result in death,
personal injury, equipment
damage, or property
damage.
Please see the Attachments section below for procedures on updating the software.

Attachments
43-080 KW Chassis List
43-080 DEF Lamp Operation Repair Procedure
43-080 KW US Customer Letter (English)
43-080 KW Canada Customer Letter (English & French)
43-080 KW Spanish Customer Letter (English & Spanish)
Authored by: JK

43-080: DEF Lamp Operation
6/2/2026

 Edit

 Clone

43-080

DEF Lamp Operation

Section
Inlet/Exhaust/Aftertreatment - 43

Subject
DEF Lamp Operation

Whats New Abstract
The repair procedure has been updated with additional note boxes for clear instructions.

Revision
06/02/2026: The repair procedure has been updated with additional note boxes for clear instructions.
03/25/2025: Campaign has resumed. Software updates are now available to complete this campaign. 39
VINs added to chassis list. Population changed from 84,239 to 84,278. Digital Display and VECU
software update procedure has been updated.
12/19/2024: Population changed from 85,119 to 84,239. Chassis removed from list that were not affected
by issue.
12/13/2024: Campaign temporarily suspended.

Condition
The Diesel Exhaust Fluid (DEF) lamp, in certain instances, may not flash, may not illuminate red, and can
be delayed by 30 seconds. This issue may cause inaccurate digital gauge notifications of the DEF
system and may cause the Check Engine Lamp to illuminate. Normally the DEF lamp would be
illuminated solid white when there are no issues with the DEF system and illuminate solid red or flashing
red when there are issues with the DEF system.
Campaign start date: 10/22/2024

Chassis Affected
84,278 (75,466 US and 8,812 Canada) model year 2021-2025, 365, 367, 389, 520, 535, 536, 537, 548,
567, 579, and 589 chassis equipped with a 7" or 15" Digital Display and VMUX 22.5/23 software.

Action
Campaign
Service all chassis affected that enter your dealership, even if the customer has no issue with the

chassis.
1. Review the attached chassis list for your dealer code and schedule your customer(s) for service if
their chassis is on the list.
2. In Service Management, select campaign 43080 to add it to the case. If the unit is released back
into service without performing the repair, make sure to also release the campaign in Service
Management.
3. If you are not using Service Management to start repair orders, review SIR for “Complete” next to
the 43080 campaign code prior to performing this repair.
4. Follow procedures to update the VECU and/or Digital Display software.

Warranty
Starting on 10/22/2024 - There is no time or mileage limit for this campaign. Peterbilt will pay for labor:
0.5 hours labor to process a file through PACCAR Vehicle Pro (PVP) and update the Digital
Display and VECU. Use Recommended Repair 43080A.
0.4 hours labor to process a file through PVP, verify software level in Digital Display and VECU,
and update either the Digital Display OR VECU software (if only one module requires a software
update). Use Recommended Repair 43080B.
0.3 hours labor to process a file through PVP, verify software level in Digital Display and VECU.
(Both Digital Display and VECU are found to be at the most current software level). Use

Recommended Repair 43080C.
For any supplemental repairs, file a long form claim and input (43080) in the “Campaign Code”
field.
File the claim within 7 days in accordance with Warranty Policy.
Cross-division repairs are not allowed for this campaign.
Take-Off Parts Disposition : N/A

PRWS CLAIM CODING​​
​ ampaign
C
​Campaign
​43080
Code:
Type:

​ ield
F
Repair

​ laim
C
​Truck ​Repair Type:
Category:

​Proactive

​ ustomer
C
Concern ​029
Code:

​Causal Code: ​95

​ orrective
C
Action
​23
Code:

​ esponsibility
R
​Camp
Code:

​003Failure
002Location:
024

​Causal Part:

​ upplier
S
Code:

​N/A

​SRT Code:

​ 43-6090Q
100-100
​ 23-006
B
0.5 hours
Perform
software
update
(Digital
Display
and VECU)
per 43-080
bulletin
procedure.
B23-20B
0.4 hours
Process
PVP file
and
program
Digital
Display OR
VECU (one
module is

already
current)
B23-20C
0.3 hours
Process
PVP file
and verify
software
for Digital
DIsplay
and VECU
(both
modules
already
current).

Parts
Software only, no parts necessary.

Procedure

WARNING!
Repair or maintenance
procedures may pose a
safety risk in limited
circumstances. You must
read all procedure steps
before performing any work
and follow all dealership
safety procedures or
precautions. Failure to
comply may result in death,
personal injury, equipment
damage, or property
damage.
Please see the Attachments section below for procedures on updating the software.

Attachments
43-080 - Chassis List
43-080 DEF Lamp Operation Repair Procedure
CUSTOMER LETTERS
43-080 - English Customer Letter
43-080 - French Customer Letter
43-080 - Spanish Customer Letter