NHTSA ID Number: 10252481
Manufacturer Communication Number: B23-010
TSB/Document Date: 2024-04-03
Summary
Service Bulletin - During engine start in cold conditions, a miscalculation in the PCM causes the air-fuel ratio to exceed DTC rich criteria.
Service Bulletin
23-010
March 27, 2024
Version 2
Software Update DTC P0300, P0301, P0302, P0303, P0304, or P0172
Supersedes 23-010, dated March 14, 2023, to revise the information.
AFFECTED VEHICLES
Year
Model
Trim Level
VIN Range
2019–23
RDX
ALL
ALL
2021–23
TLX
ALL (Except Type S)
ALL
REVISION SUMMARY.
This service bulletin has been revised extensively; American Honda
recommends you read this bulletin 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).
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 20-053, to see if it matches the customer contention and regional trend more closely.
POSSIBLE CAUSE
During engine start in cold conditions, a miscalculation in the PCM causes the air-fuel ratio to exceed DTC rich criteria.
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)
94109-14000
1
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.
© 2024 American Honda Motor Co., Inc. – All Rights Reserved
Page 1 of 4
REQUIRED MATERIALS
Part Name
Part Number
Quantity
0W-20 (Bulk Oil Participants) Gallon
FS020-BAS-N0L
RDX - 1.15
TLX - 1.05
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
B23010A
37805-5YF-AH2
1255D8L
Reset the throttle
position value and idle
learn procedure.
0.2 hr
03214
03217
B23010A
37805-5YF-AH2
1255D8K
Replace the oil
0.3 hr
03214
03217
B23010B
37805-5YF-AH2
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
1.008.024 or later
HDS Software Version
3.105.028 or later
Honda ECU Reprogramming
3.6.0.0 or later
Update only the systems and software listed in this service bulletin.
For more information about updating vehicle systems, refer to service bulletin 22-100, Updating Control Units/Modules
with the Honda ECU Reprogramming Application.
Do not use the MongoosePRO VCI for this service bulletin as it is not an American Honda approved device.
RDX
Year
Software System
Program ID (or later)
2019
ADV (SH-AWD)
PGM-FI
37805-5YF-C740
2019
ADV (2WD)
PGM-FI
37805-5YF-C540
2019
A-Spec (SH-AWD), Base (SH-AWD),
Tech (SH-AWD)
PGM-FI
37805-5YF-C840
2019
A-Spec (2WD), Base (2WD),
Tech (2WD)
PGM-FI
37805-5YF-A940
2020
ADV (SH-AWD)
PGM-FI
37805-5YF-A270
2020
ADV (2WD)
PGM-FI
37805-5YF-A170
2020
A-Spec (SH-AWD), Base (SH-AWD),
Tech (SH-AWD)
PGM-FI
37805-5YF-A470
Page 2 of 4
2020
A-Spec (2WD), Base (2WD), Tech
(2WD)
PGM-FI
37805-5YF-A370
2021
ADV (2WD)
PGM-FI
37805-5YF-C150
2021
Advance (SH-AWD), LTD (PMC) (SHAWD)
PGM-FI
37805-5YF-C250
2021
A-Spec (SH-AWD), Base (SH- AWD),
Tech (SH-AWD)
PGM-FI
37805-5YF-C450
2021
A-Spec (2WD), Base (2WD), Tech
(2WD)
PGM-FI
37805-5YF-C350
2022
ADV (SH-AWD)
PGM-FI
37805-5YF-AA30
2022
Base (SH-AWD), Tech (SH-AWD)
PGM-FI
37805-5YF-AB30
2022
Base (2WD), Tech (2WD)
PGM-FI
37805-5YF-AC30
2022
A-Spec ADV (SH-AWD), ADV (SHAWD)
PGM-FI
37805-5YF-AD30
2022
A-Spec (SH-AWD)
PGM-FI
37805-5YF-AE30
2022
A-Spec (2WD)
PGM-FI
37805-5YF-AF30
2023
ADV (SH-AWD)
PGM-FI
37805-5YF-AG20
2023
Base (SH-AWD), Tech (SH-AWD)
PGM-FI
37805-5YF-AH20
2023
Base (2WD), Tech (2WD)
PGM-FI
37805-5YF-AJ20
2023
A-Spec ADV (SH-AWD), ADV
(SH-AWD)
PGM-FI
37805-5YF-AK20
2023
A-Spec (SH-AWD)
PGM-FI
37805-5YF-AL20
2023
A-Spec (2WD)
PGM-FI
37805-5YF-AM20
TLX
Year
Software System
Program ID (or later)
2021
ADV (2WD)
PGM-FI
37805-6S8-A570
2021
ADV (SH-AWD)
PGM-FI
37805-6S8-A770
2021
A-Spec (SH-AWD), Base (SH- AWD),
Tech (SH-AWD)
PGM-FI
37805-6S8-A870
2021
A-Spec (2WD), Base (2WD),
Tech (2WD)
PGM-FI
37805-6S8-A670
2022
ADV (2WD)
PGM-FI
37805-6S8-A920
2022
Base (2WD), Tech (2WD), ASpec (2WD)
PGM-FI
37805-6S8-AA20
2022
ADV (SH-AWD)
PGM-FI
37805-6S8-AB20
2022
A-Spec (SH-AWD), Base (SH- AWD),
Tech (SH-AWD)
PGM-FI
37805-6S8-AC20
2023
ADV (2WD)
PGM-FI
37805-6S8-AH20
2023
A-Spec (2WD), Base (2WD),
Tech (2WD)
PGM-FI
37805-6S8-AJ20
2023
ADV (SH-AWD)
PGM-FI
37805-6S8-AK20
2023
A-Spec (SH-AWD), Base
(SH-AWD), Tech (SH-AWD)
PGM-FI
37805-6S8-AL20
Page 3 of 4
REPAIR PROCEDURE
1. Reset the maintenance minder light 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. Do not replace the oil filter.
NOTE: RDX - 4.6 quarts and TLX – 4.6 quarts.
3. Connect the i-HDS to the vehicle.
NOTE:
• 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.
4. Update the PGM-FI software; see service bulletin 22-100, Updating Control Units/Modules with the Honda ECU
Reprogramming Application.
5. Do an ALL DTC CHECK to clear any codes that may have been set during the update.
6. 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.
Page 4 of 4
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TSB/Document ID: B23-010
Replacement Service Bulletin Number:
MFR Communication Date: 2024-03-27
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: POWER TRAIN
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