Service Bulletin

25-061

July 18, 2025

Version 2

Warranty Extension: 2013–17 Odyssey MIL Comes on with DTCs P0301
Thru P0304 (6 months)
Supersedes Version 1, dated June 17, 2025, to revise the information highlighted in yellow.

APPLIES TO
Year

Model

Trim Level

2013–17

Odyssey

ALL

VIN Range
Check the iN VIN status for eligibility.

REVISION SUMMARY
Under PARTS INFORMATION, REPAIR PROCEDURE A, a part was removed.
BACKGROUND
The piston ring function deteriorates due to ring wear and sticking from sludge. Oil from the crankcase adheres to the spark
plug leading to carbon fouling and misfire. This can set DTCs P0301 No. 1 cylinder misfire detected, P0302 No. 2 cylinder
misfire detected, P0303 No. 3 cylinder misfire detected, P0304 No. 4 cylinder misfire detected, and cause the MIL to
come on.
American Honda is extending the warranty coverage for this condition to January 31, 2026. Any repair orders issued after
that date are no longer valid.
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.
CORRECTIVE ACTION
Complete the DIAGNOSIS PROCEDURE and, if necessary, update the PCM software, replace affected spark plugs then
clean pistons and replace the piston rings. If cylinder inspection fails, perform engine block replacement, replace affected
spark plugs, and update the PCM software.
Additionally, the following videos are available to help with this bulletin:
•

Tech2Tech: "How to Clean Piston Ring Grooves”

•

Tech2Tech: “Let's Talk Piston Ring Compressors”

•

Tech2Tech: “Cylinder Wall Inspection Tool”

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.

© 2025 American Honda Motor Co., Inc. – All Rights Reserved

Page 1 of 65

WARRANTY CLAIM INFORMATION
FLAT RATE NOTE: The procedure in this bulletin is different than the service manual. This procedure does not require the
complete removal of the power steering pump, catalytic converter(s), engine and transmission, or the crankshaft. As a
result, the operation number is unique and the FRT is reduced (Repair Procedure A)
DTC P0301, P0302, or P0303
No scratching or scoring detected
Operation
Number

Description

Flat Rate
Time

DTC P0301, P0302 or
P0303: Inspect spark
plug(s)

0.3hr

A

Repair procedure A:
Remove cylinder head,
inspect cylinders, clean
pistons 1-3, replace piston
rings 1-3 and replace
spark plugs 1-4 (includes
idle learn)

8.3hr

C

Update the PCM software
(includes DTC clear)

0.1hr

1115A7

Defect
Code

Symptom
Template ID
Code

Failed Part Number

6Z600

QLT00

A25061A

13021-5G0-A01

Defect
Code

Symptom
Code

Template ID

Failed Part Number

6Z600

QLT00

A25061B

13021-5G0-A01

Scratching or scoring detected
Operation
Number

Description

Flat Rate
Time

1115A7

DTC P0301, P0302 or
P0303: Inspect spark
plug(s)

0.3hr

B

Repair procedure B:
Remove cylinder head,
inspect cylinders, replace
short block and replace
spark plugs 1-4 (includes
Idle learn & align)

11.1

C

Update the PCM software
(includes DTC clear)

0.1hr

Page 2 of 65

DTC P0304
No scratching or scoring detected
Operation
Number

Description

Flat Rate
Time

1115A8

DTC P0304: Inspect spark
plug(s)

0.3hr

A

Repair procedure A:
Remove cylinder heads,
inspect cylinders, clean
pistons 1-4, replace piston
rings 1-4 and replace
spark plugs 1-4 (includes
idle learn)

9.1hr

C

Update the PCM software
(includes DTC clear)

0.1hr

Defect
Code

Symptom
Code

Template ID

Failed Part Number

6Z600

QLT00

A25061C

13021-5G0-A01

Defect
Code

Symptom
Code

Template ID

Failed Part Number

6Z600

QLT00

A25061D

13021-5G0-A01

Scratching or scoring detected
Operation
Number

Description

Flat Rate
Time

1115A8

DTC P0304: Inspect spark
plug(s)

0.3hr

B

Repair procedure B:
Remove cylinder heads,
inspect cylinders, replace
short block and replace
spark plugs 1-4 (includes
Idle learn & align)

11.1hr

C

Update the PCM software
(includes DTC clear)

0.1hr

Page 3 of 65

PARTS INFORMATION
Repair Procedure A: Piston Cleaning and Ring Replacement
Part Name

Part Number

Quantity
Cyl 1-3

Cyl 1-4

Cyl. Gasket (Fr)

12251-R70-A01

-

1

Cyl. Gasket (Rr)

12261-R70-A01

1

1

94109-14000

1

1

EGR Pipe Gasket A

18716-R70-A01

1

1

EGR Pipe Gasket B

18719-R70-A01

1

1

Ex. Chamber Gasket

18115-R70-A01 or 181155G0-A01

1

2

Ex. Pipe Gasket

18212-SA7-003

2

2

Head Gasket Fr. (Valve Cover)

12030-R70-A00

-

1

Head Gasket Rr. (Valve Cover)

12050-R70-A00

1

1

In. Manifold Gasket (Intake Top Cover)

17146-R70-A01

1

1

In. Manifold Gasket (In. Manifold to Base)

17105-RCJ-A01

1

1

Oil Filter

15400-RTA-003

1

1

O-ring (7.47 mm x 3.6 mm)

91301-PLC-000

2

2

O-ring (31.2 mm x 4.1 mm)

91314-PH7-003

2

2

Piston Ring Set

13011-RV0-305

3

4

Pre-chamber Gasket

18393-SDB-A00

1

1

Self-locking Nut (8 mm)

90212-RCA-A01

4

8

Self-locking Nut (10 mm)

90212–SA5-003

9

9

Spark Plug

12290-R71-L01

4

4

Strainer O-ring

15221-RYE-A01

1

1

Bolt, Flange (side engine mount bolts)

90164-SHJ-A00

2

2

Bolt, Flange (12 x 115) (side engine mount
bolt)

90161-SZA-A00

1

1

Drain Washer 14 mm