NHTSA ID Number: 11000139
Manufacturer Communication Number: A23-026
TSB/Document Date: 2024-05-15
Summary
Service Bulletin - During engine start in cold conditions, a miscalculation in the PCM causes the air-fuel ratio to exceed DTC rich criteria, resulting in the vehicle experiencing drivability concerns. This issue is most common in regions with cold weather.
Service Bulletin
23-026
May 2, 2024
Version 2
Software Update DTC P0300, P0301, P0302, P0303, P0304, or P0172
Supersedes 23,026, dated March 14, 2023, to revise the information.
AFFECTED VEHICLES
Year
Model
VIN Range
2018–2022
Accord
2.0L
ALL
REVISION SUMMARY
This service bulletin has been revised extensively; American Honda recommends you read it in its entirety.
SYMPTOM
Under certain circumstances, the vehicle may experience drivability concerns. This may result in the following DTC’s to set:
• P0300 (Random Misfire Detected),
•
P0301 (No. 1 Cylinder Misfire Detected),
•
P0302 (No. 2 Cylinder Misfire Detected),
•
P0303 (No. 3 Cylinder Misfire Detected),
•
P0304 (No. 4 Cylinder Misfire Detected),
•
P0172 (Fuel System Too Rich).
POSSIBLE CAUSE
During engine start in cold conditions, a miscalculation in the PCM causes the air-fuel ratio to exceed DTC rich criteria.
NOTE:
• This issue is most common in regions with cold weather.
•
If this issue was experienced in a region that does not match the above description, please consider viewing
SB 21-052, to see if it matches the customer contention and regional trend more closely.
CORRECTIVE ACTION
Reset the maintenance minder light and replace only the oil. Clear any DTC’s and update the PGM-FI software with the
latest version. Reset the throttle position learned values and do the PCM idle learn procedure.
PARTS INFORMATION
Part Name
Part Number
Quantity
Drain Plug Washer (14mm)
1
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.
© 2024 American Honda
Motor Co., Inc. – All Rights Reserved
Page 1 of 3
REQUIRED MATERIALS
Part Name
Part Number
Quantity
0W-20 (Non-Bulk Oil Participants) Quarts
08798-9063
5
WARRANTY CLAIM INFORMATION
The normal warranty applies.
Operation
Number
Description
Flat Rate
Time
Defect
Code
Symptom
Code
Template
ID
Failed Part Number
1255D8
Update PGM-FI
software (includes
DTC clear).
0.2 hr
03214
03217
A23026A
37805-6B2-AA1
1255D8D
Reset the throttle
position values and
Idle Learn procedure.
0.2 hr
03214
03217
A23026A
37805-6B2-AA1
1255D8K
Replace the oil.
0.3 hr
03214
03217
A23026B
37805-6B2-AA1
Skill Level: Repair Technician
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
1.009.003 or later
HDS Software Version
3.105.036 or later
4.1.0.0 or later
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
Software System
Program ID (or later)
2018–2019
Sport, EX-L
PGM-FI
37805-6B2-AA10
2018–2019
Touring
PGM-FI
37805-6B2-AB10
2020
Sport, EX-L
PGM-FI
37805-6B2-A760
2020
Touring
PGM-FI
37805-6B2-A860
2021–2022
Sport
PGM-FI
37805-6B2-A970
2021–2022
Touring
PGM-FI
37805-6B2-C570
REPAIR PROCEDURE
1. Reset the maintenance minder main code A.
NOTE: The maintenance minder light may not reset after the update is complete. Reset the maintenance minder first.
2. Drain and refill the engine oil, 4.6 quarts.
NOTE: Do not replace the oil filter.
3. Connect the i-HDS to the vehicle.
Page 2 of 3
4. Update the PGM-FI using the i-HDS. See SOFTWARE UPDATE PROCEDURE.
5. Reset the throttle position learned values then do the PCM idle learn procedure. Refer to the service information for
additional instructions.
NOTE: More information on this procedure can be found in the Tech2Tech video titled, A Look at PCM Idle Learn
SOFTWARE UPDATE PROCEDURE
Important Information:
• Do not use a lithium-ion jump pack to supply power to the battery during reprogramming. Lithium-ion jump packs are
designed to provide pulses of high amperage and do not provide consistent power to the battery.
• Make sure the 12-volt battery is fully charged before starting an update.
•
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 to clear any codes that may have been set during the update.
Page 3 of 3
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TSB/Document ID: A23-026
Replacement Service Bulletin Number:
MFR Communication Date: 2024-05-02
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
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