SB18-L-002B

BULLETIN NUMBER:
SB18-L-002B
IMPORTANT SERVICE
INFORMATION FOR:
 SERVICE MANAGER
 SERVICE ADVISOR
 TECHNICIAN
 PARTS DEPARTMENT
 WARRANTY PERSONNEL
ISSUE DATE:
FEBRUARY 2021
GROUP:
MISCELLANEOUS
DTC P20EE DEF CONTROL UNIT RECALIBRATION
AFFECTED VEHICLES

2016 – 2019MY Isuzu N-Series
Equipped with 5.2L 4HK1 Diesel Engines
This bulletin supersedes service bulletin SB18-L-002A. This bulletin is being
revised to update available calibrations. Please discard previous bulletin SB18-L002A.
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 does NOT match the calibration
number listed in the table below:
MY
2016
2017
2018
2019
Vehicle
N-Series
N-Series
N-Series
N-Series
Engine
5.2L
5.2L
5.2L
5.2L
Trans
AUTO
AUTO
AUTO
AUTO
Calibration #
98320685
97536099
97536100
97536101
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
L4012
Description
DTC P20EE DCU
Recalibration
Labor Time
0.4