NHTSA ID Number: 10189795
Manufacturer Communication Number: A21-037
TSB/Document Date: 2021-04-05
Summary
Service Bulletin - The current Battery Control Module (BCM) ECU software does not properly detect a deteriorated high voltage battery
condition and does properly illuminate the MIL.
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TSB/Document ID: A21-037
Replacement Service Bulletin Number:
MFR Communication Date: 2021-03-26
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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Service Bulletin
21-037
March 26, 2021
Version 1
Emissions Recall: 2014 Accord Plug-In Hybrid (PHEV) Battery Software
Update
AFFECTED VEHICLES
Year
Model
Trim Level
VIN Range
2014
Accord Plug-In Hybrid (PHEV)
ALL
Check the iN VIN status for eligibility.
BACKGROUND
The current Battery Control Module (BCM) ECU software does not properly detect a deteriorated high voltage battery
condition and does properly illuminate the MIL.
CUSTOMER NOTIFICATION
Owners of affected vehicles will be sent a notification of this campaign.
Do an iN VIN status inquiry to make sure the vehicle is shown as eligible.
Some vehicles affected by this campaign may be in your new or used vehicle inventory. Repair these vehicles before they
are sold.
CORRECTIVE ACTION
Update the high-voltage battery BCM software.
WARRANTY CLAIM INFORMATION
Software Update Only (Use this template if the DTC returns after the test-drive)
Operation
Number
Description
Flat Rate
Time
Defect
Code
Symptom
Code
Template
ID
Failed Part Number
1185B7
Update the highvoltage battery BCM
software.
0.2 hr.
6BE00
UA500
A21037A
1D100-5K0-A00
Software Update, Charge High-Voltage Battery Pack and Test-Drive (Use this template if the DTC does not return)
Operation
Number
Description
Flat Rate
Time
1185B7
Update the highvoltage battery BCM
software.
0.2 hr.
Charge battery pack
and test-drive - Add
0.5 hr.
A
Defect
Code
Symptom
Code
Template
ID
Failed Part Number
6BE00
UA500
A21037B
1D100-5K0-A00
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
Page 1 of 9
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 01-023, Updating Control Units/Modules.
Year/Model
Vehicle System
2014 Accord Plug-In Hybrid
BCM
Program ID (or later)
1K101-5K0-A150
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.
Page 2 of 9
1. Update the BCM software using the J2534 Rewrite software with the DST-i. Refer to service bulletin 01-023, Updating
Control Units/Modules.
2. Select Start to continue. Entering a service bulletin number is not required.
3. Select Start.
Page 3 of 9
4. Select Next.
5. Follow the prompts on the screen.
Page 4 of 9
6. Enter the VIN, RO# and miles.
Page 5 of 9
8. Select ENTER.
9. Select ENTER.
Page 6 of 9
10. Programming will begin.
11. Once programming is complete, turn the ignition switch to OFF.
Page 7 of 9
12. Then turn the ignition switch to ON when instructed.
13. Exit once the update is complete.
14. Fully charge the IMA battery, then test-drive the vehicle.
15. Connect the HDS, and do an all-DTC check.
Is DTC P0A7F present?
Yes - Replace the IMA Battery. Refer to service bulletin 21-038, Warranty Extension: 2014 Accord Plug-In Hybrid
(PHEV) High Voltage Battery Pack Deterioration.
No – Repair is complete.
Page 8 of 9
16. California residents only: Fill out a Vehicle Emissions Recall – Proof of Correction certificate, and use UA5 as the recall
number. Have the service advisor give the certificate to your customer, and advise him or her to keep it as proof that
the recall was completed. Your customer will need to submit this certificate to the DMV only if the DMV requests it. If
you need more certificates, use reorder number Y0657.
END
Page 9 of 9
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