A23-027

Service Bulletin
23-027
July 26, 2023
Version 1
After Idle Stop Engages, Vehicle Does Not Auto Restart
AFFECTED VEHICLES
Year
Model
Trim
VIN Range
2018–19
Odyssey
Elite, Touring
ALL
2020–22
Odyssey
ALL
ALL
2023
Odyssey
ALL
5FNRL6...PB00001 thru 5FNRL6...PB027460
SYMPTOM
Under certain circumstances, after coming to a stop and the idle stop feature engages, the vehicle may not
automatically restart. Typically, the customer can immediately restart the vehicle by selecting Park and pushing the
ENGINE START/STOP button.
POSSIBLE CAUSE
The engine may exhibit higher resistance at a certain TDC position than the applied starter torque due to a battery
reaching the end of it’s useful life.
CORRECTIVE ACTION
Update the PGM-FI software.
NOTE: The software update will decrease the idle stop operating range. As a result, the customer may notice reduced
idle stop engagement when their vehicle’s battery is approaching the end of its useful life.
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
A23027A
37805-5MR-C12
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.
©
2023 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
1.008.020 or later
HDS Software Version
3.105.009 or later
Honda ECU Reprogramming
3.6.0.0
J2534 rewrite Version
1.00.0034
J2534 Rewrite Database Update
20230414_2492
Update only the systems and software listed in this service bulletin.
Do not use the MongoosePRO VCI for this service bulletin as it is not an American Honda-approved device.
For more information about updating vehicle systems, refer to service bulletin 22-100, Updating Control Units/Modules
with the Honda ECU Reprogramming Application.
Year/Model
Vehicle System
Program ID (or later)
2018 Odyssey (Elite, Touring)
PGM-FI
37805-5MR-3250
2019 Odyssey (Elite, Touring)
PGM-FI
37805-5MR-4170
2020 Odyssey (LX)
PGM-FI
37850-5MR-4190
2020 Odyssey (EX, EX-L, Elite, Touring)
PGM-FI
37850-5MR-4180
2021 Odyssey ALL
PGM-FI
37805-5MR-C750
2022 Odyssey ALL
PGM-FI
37805-5MR-C930
2023 Odyssey ALL
PGM-FI
37805-5MR-C120
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REPAIR PROCEDURE
NOTICE
•
Make sure the 12-volt battery is fully charged before starting an update.
•
Connect a fully charged jumper battery pack, the Midtronics GR8-110P AST in Power Supply Mode or the
Midtronics DCA-8000 Dynamic Diagnostic Charging System in Reflash Mode directly to the vehicle’s 12-volt battery.
Leave it connected during the entire procedure to maintain a steady voltage.
•
If the vehicle’s 12-volt battery drops below 10-volts during the update, the programming status bar may not present
accurately, or the Honda ECU Reprogramming application may display an error message.
•
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, see service bulletin 22-100, Updating Control Units/Modules with the Honda ECU
Reprogramming Application.
2. Do an ALL DTC CHECK and clear any codes that may have set during the update.
END
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