SB18L002A

BULLETIN NUMBER:
SB18-L-002A
IMPORTANT SERVICE
INFORMATION FOR:
 SERVICE MANAGER
 SERVICE ADVISOR
 TECHNICIAN
 PARTS DEPARTMENT
 WARRANTY PERSONNEL
ISSUE DATE:
MARCH 2019
GROUP:
MISCELLANEOUS
DTC P20EE DEF CONTROL UNIT RECALIBRATION
AFFECTED VEHICLES

2016 – 2020MY Isuzu N-Series
Equipped with 5.2L 4HK1 Diesel Engines
This bulletin supersedes service bulletin SB18-L-002. This bulletin is being revised
to update affected model years. Please discard previous bulletin SB18-L-002.
CONDITION
Some customers may experience an illuminated Malfunction Indicator Light (MIL) with
DTC P20EE Diesel Exhaust Fluid (DEF) System NOx Trap Low Efficiency set without
an apparent cause. New calibrations for the DEF Control Unit (DCU) have been
developed to address this concern.
Follow the diagnostic for this DTC. If no fault can be found when performing the normal
diagnosis, follow the service procedure in this bulletin to reprogram the DEF Control
Module.
SERVICE PROCEDURE
Reprogram the DCU with the latest software and calibration using the Isuzu Diagnostic
Service System (IDSS) if the calibration part number is NOT listed below:
MY
2016
2017
2018
2019
2020
Vehicle
N-Series
N-Series
N-Series
N-Series
N-Series
Engine
5.2L
5.2L
5.2L
5.2L
5.2L
Trans
AUTO
AUTO
AUTO
AUTO
AUTO
Calibration #
97536098 or Higher
97536099 or Higher
97536100 or Higher
97536101 or Higher
97536102 or Higher
NOTE: If the calibration number IS listed above, follow the Intermittent Conditions
diagnostics in the appropriate Workshop Manual.
WARRANTY INFORMATION
For vehicles repaired under warranty, use:
Labor Operation Code
Description
Labor Time
L4012
DTC P20EE DCU
Recalibration
0.4