A21-052

Service Bulletin
21-052
July 13, 2021
Version 2
MIL Is Flashing with Loss of Power
Supersedes 21-052, dated June 3, 2021, to revise the information highlighted in yellow.
AFFECTED VEHICLES
Year
Model
Trim Level
VIN Range
2018–21
Accord
ALL 2.0L Turbo
ALL
REVISION SUMARY
SOFTWARE INFORMATION and REPAIR PROCEDURE were updated.
SYMPTOM
The MIL is flashing with a loss of power.
POSSIBLE CAUSE
Humid air within the intake tract may condense and accumulate excessive moisture during steady driving.
CORRECTIVE ACTION
Replace the intercooler and intercooler gasket. Update and aim the millimeter wave radar, then update the PGM-FI
software.
PARTS INFORMATION
Part Name
Part Number
Quantity
Intercooler
19710-6A0-A01
1
Intercooler Gasket
19716-6A0-A01
1
WARRANTY CLAIM INFORMATION
The normal warranty applies.
Operation
Number
Description
Flat Rate
Time
1111E1
Replace the intercooler.
0.7 hr
Millimeter wave radar unit
aim - Add
0.6 hr
Update the PGM-FI software
0.2 hr
B
1255D8
Defect
Code
00701
Symptom
Code
Template
ID
Failed Part Number
08901
A21052A
19710-6B2-A01
Skill Level: Repair Technician
CUSTOMER 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 Honda 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
1.006.033 or later
HDS Software Version
3.104.030 or later
J2534 Rewrite Software Information
PC Application Version
1.2.1.1
Database Update
12-May-2021 or later
NoticeDB Version
12-May-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 01-023, Updating Control Units/Modules.
Year/Model
Vehicle System
Software
2018–19 Accord EX-L, Sport
PGM-FI
37805-6B2-A570
2018–19 Accord Touring
PGM-FI
37805-6B2-A670
2018-19 Accord Sport with M/T
PGM-FI
37805-6B2-A070
2020 Accord Sport with M/T
PGM-FI
37805-6B2-A220
2020 Accord EX-L, Sport
PGM-FI
37805-6B2-A730
2020 Accord Touring
PGM-FI
37805-6B2-A830
2021 Accord Sport
PGM-FI
37805-6B2-A930
2021 Accord Touring
PGM-FI
37805-6B2-C530
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REPAIR PROCEDURE
1. Remove the front bumper.
NOTE: There is no need to remove the wave radar or cover when removing the bumper.
2. Remove the millimeter wave radar bracket.
NOTE: Do not remove the millimeter wave radar cover, millimeter wave radar, or the adapter frame when removing the
bracket.
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3. Remove the intercooler.
4. Install the new intercooler and gasket, and torque the two bolts mounting the intercooler to 22 N·m (16 lb-ft) and the
two bolts with brackets to 9.5 N·m (7 lb-ft).
5. Tighten the hose bands to the specified condition below.
6. Install the millimeter wave radar bracket and the front bumper.
7. Aim the wave radar assembly. See the service information for the aiming procedure.
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8. Update the PGM-FI software and the millimeter wave radar using the J2534 Rewrite software with the DST-i. Refer to
service bulletin 01-023, Updating Control Units/Modules.
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.
END
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