NHTSA ID Number: 11028309
Manufacturer Communication Number: E326
TSB/Document Date: 2026-02-05
Summary
EPA 17-21 MX-13 Fuel Injector Connector SRTs have been added to the SRT tables in PRWS for replacement of the injector connector shells
1/14/26, 8:09 AM
Powertrain Service Bulletin
E326: EPA 17-21 MX-13 Fuel Injector Connector Upgrade
Number
Edit
Clone
E326
Description
EPA 17-21 MX-13 Fuel Injector Connector Upgrade
Subject
EPA 17-21 MX-13 Fuel Injector Connector Upgrade
Date
3/11/2025
Revision
01/14/2026: Added information for SRTs and repair process in RMI.
12/05/2025: Added a pin extracion tool part number.
Condition
Information Only
When performing upgrades that require disconnecting the injectors or removing the valve train casing, it's
possible that the locking tabs on the injector connector shell (part number 1439888PE) could break.
1/3
1/14/26, 8:09 AM
Powertrain Service Bulletin
Since the injector connector shells are now in stock, upgrading the entire valve train casing assembly
should not be the initial approach to address this issue.
Claims submitted that include only the upgrade of the valve train casing assembly, without first attempting
to upgrade the injector connector shell(s), may be denied.
Chassis Affected
All chassis equipped with EPA17-21 MX-13 engines.
Action
Information Only
To increase uptime and serviceability, dealers should stock the injector connector shells (1439888PE).
Upgrades to broken connector shells should occur rather than replacement of the valve train casing
assembly.
Warranty
SRT codes have been added to the SRT tables for injector connector shell replacement. Please
reference SRT codes 044-687: Connector 2-Pin (One Injector) and 044-688: Connector 2-Pin (Six
Injectors).
When replacing broken injector connector shells, do not reference E326 in the campaign code field of the
2/3
1/14/26, 8:09 AM
Powertrain Service Bulletin
warranty claim. This is an informational bulletin only.
Parts
Quantity
Part
Number
Description
Stock
Location
(PACCAR
Parts
PDC /
DSP)
As
1439888PE Connector
Needed
As
Needed
539972-1
Pin Extraction
Tool
Background
Injector connector shell locking tabs may break when disconnected, resulting in valve train casing
assembly replacement.
Procedure
Injector connector shell replacement procedures can be found in RMI by searching “valve train casing”,
then select Parts > Valve train casing > Jobs > replace 1 (one) connector 2-pin (Basic assembly).
When connector shells are replaced according to RMI, a pin extraction tool is required to complete the
repair. This tool is part number 539972-1, available through PACCAR Parts.
3/3
1/14/26, 8:09 AM
Powertrain Service Bulletin
E326: EPA 17-21 MX-13 Fuel Injector Connector Repair
Number
Edit
Clone
E326
Subject
EPA 17-21 MX-13 Fuel Injector Connector Repair
Date
3/6/2025
Revision
01/14/2026: Added information for SRTs and repair process in RMI.
12/05/2025: Added a pin extraction tool part number.
Condition
During repairs which involve disconnecting the injectors or removing the valve train casing, the injector
connector shells (1439888PE) locking tabs may be broken. Since the injector connector shells were not
previously available, the entire valve train casing assembly had to be replaced to fix the issue.
Chassis Affected
All chassis equipped with EPA17-21 MX-13 engines.
Action
Information Only
To prevent downtime, dealers should stock the injector connector shells (1439888PE). Replacement of
1/2
1/14/26, 8:09 AM
Powertrain Service Bulletin
broken connector shells should occur rather than replacement of the valve train casing assembly.
Warranty
SRT codes have been added to the SRT tables for injector connector shell replacement. Please
reference SRT codes 044-687: Connector 2-Pin (One Injector) and 044-688: Connector 2-Pin (Six
Injectors).
When replacing broken injector connector shells, do not reference E326 in the campaign code field of the
warranty claim. This is an informational bulletin only.
Parts
Quantity
Part
Number
Description
Stock
Location
(PACCAR
Parts
PDC /
DSP)
As
1439888PE Connector
Needed
As
Needed
539972-1
Pin Extraction
Tool
Background
Injector connector shell locking tabs may break when disconnected, resulting in valve train casing
assembly replacement.
Procedure
Injector connector shell replacement procedures can be found in RMI by searching “valve train casing”,
then select Parts > Valve train casing > Jobs > replace 1 (one) connector 2-pin (Basic assembly).
When connector shells are replaced according to RMI, a pin extraction tool is required to complete the
repair. This tool is part number 539972-1, available through PACCAR Parts.
2/2
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TSB/Document ID: E326
Replacement Service Bulletin Number:
MFR Communication Date: 2026-01-15
MFR Internal Campaign ID/Software Version: E326
Communication Type: Emissions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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