B21-011

Service Bulletin
21-011
August 6, 2021
Version 2
MIL Comes On with DTC U0155
Supersedes 21-011, dated March 26,2021, to revise the information highlighted in yellow
AFFECTED VEHICLES
Year
Model
Trim Level
VIN Range
2021
ILX
ALL
19UDE2…MA00001 thru 19UDE2…MA007208
2022
MDX
ALL
5J8YE1…NL00001 thru 5J8YE1…NL009634
5J8YD9…NL00001 thru 5J8YD9…NL002292
REVISION SUMMARY
Under AFFECTED VEHICLES, the VIN Range was updated.
SYMPTOM
The MIL comes on with DTC U0155 (Lost Communication with Gauge Control Module).
POSSIBLE CAUSE
During certain conditions after conducting an evaporative emissions leak check, a mismatch in control module shutdown
commands results in the DTC being set.
CORRECTIVE ACTION
Update the PGM-FI software.
WARRANTY CLAIM INFORMATION
The normal warranty applies.
Operation
Number
Description
Flat Rate
Time
Defect
Code
Symptom
Code
Template
ID
Failed Part Number
1255D8
Update the PGM-FI
software.
0.2 hr
03214
03217
B21011A
37805-61A-A45
Skill Level: Repair Technician
CLIENT INFORMATION: The information in this bulletin is intended for use only by skilled technicians who have the proper tools, equipment, and
training to correctly and safely maintain your vehicle. These procedures should not be attempted by “do-it-yourselfers,” and you should not assume this
bulletin applies to your vehicle, or that your vehicle has the condition described. To determine whether this information applies, contact an authorized
Acura automobile dealer.
© 2021 American Honda Motor Co., Inc. – All Rights Reserved
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SOFTWARE INFORMATION
NOTE: Unnecessary or incorrect repairs resulting from a failure to update the diagnostic and reprogramming software are
not covered under warranty.
Before beginning the repair, make sure all diagnostic and reprogramming software are updated as listed.
i-HDS Software Version
1.006.026 or later
HDS Software Version
3.104.014 or later
J2534 Rewrite Software Information
PC Application Version
1.2.1.1
Database Update
12-MAR-2021 or later
NoticeDB Version
12-MAR-2021 or later
Update only the systems and software listed in this service bulletin.
American Honda has validated and approved the Denso DST-I as the vehicle communication interface (VCI) to
support this service bulletin.
For more information about updating vehicle systems, refer to service bulletin 01-026, Updating Control Units/Modules.
Year/Model
Vehicle System
Program ID (or later)
2021 ILX Base, Prem, Tech
PGM-FI
37805-R4H-C420
2021 ILX Prem (A-Spec),
Tech (A-Spec)
PGM-FI
37805-R4H-C520
2022 MDX Base, Tech
PGM-FI
37805-61A-A450
2022 MDX A-Spec (AWD), ADV
(AWD), Base (AWD), Tech (ADV)
PGM-FI
37805-61A-A750
REPAIR PROCEDURE
NOTE:
•
•
•
•
•
•
•
Make sure the 12-volt battery is fully charged before starting an update.
Connect a fully charged jumper battery to the vehicle, and leave it connected during the entire procedure to maintain
steady voltage.
Do not use the GR8 because the vehicle requires a steady electrical current.
Control module failure caused by the improper completion of a software update (early key cycle, low battery voltage,
disconnected DLC cable, etc.) is not covered by warranty.
If an error occurs during the update or the i-HDS freezes, do not disconnect the battery or turn the ignition to OFF.
Reboot the i-HDS, and start over.
To prevent control unit damage, do not operate anything electrical (headlights, audio system, brakes, A/C, power
windows, door locks, etc.) during the update.
Warranty reimbursement for technician labor is not allowed for routine checking/installation of any available software
update.
1. Update the PGM-FI software using the J2534 Rewrite software with the DST-i. Refer to service bulletin 01-026,
Updating Control Units/Modules.
NOTE: This update does not require entering a service bulletin number
2. Clear any DTCs.
END
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