Service Bulletin

26-002

February 1, 2026

Version 1

Warranty Extension: 2013–15 Pilot MIL Comes on with DTCs P0301 Thru
P0304
APPLIES TO
Year

Model

Trim Level

2013–15

Pilot

ALL

VIN Range
Check the iN VIN status f or eligibility.

BACKGROUND
American Honda is extending the warranty for repairs related to engine misfire due to piston ring deterioration (that triggers
DTCs P0301 thru P0304) to 10 years from the original date of purchase or 150,000 miles, whichever comes first.
The piston ring function deteriorates due to ring low wear toughness and sticking from sludge. Oil 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.
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 the cylinder wall inspection fails, perform an engine block replacement,
replace the 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 "Check out the 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.

© 2026 American Honda Motor Co., Inc. – All Rights Reserved

Page 1 of 109

WARRANTY CLAIM INFORMATION
FLAT RATE NOTE: Repair Procedure A 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.
IMPORTANT: A printed copy of the completed ALL DTC check is required to be attached to the claim submission. If the
ALL DTC check printout is not attached to the claim, the claim will not be processed or could be subject to debit.
DTC P0301, P0302, or P0303
No Scratching or Scoring Detected
Operation
Number

1115A9

A

C

Description

Flat Rate
Time

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

0.3 hr

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).

8.9 hr

Update the PCM
software (includes
DTC clear).

Defect
Code

6V500

Symptom
Code

Template ID

Failed Part Number

QLW00

A26002A

13021-R70-A11

Symptom
Code

Template ID

Failed Part Number

0.1 hr

Scratching or Scoring Detected
Operation
Number

Description

Flat Rate
Time

1115A9

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

0.3 hr

B

Repair Procedure B:
Remove cylinder heads,
inspect cylinders, replace
short block and replace
spark plugs 1-4 (includes
idle learn and align).

10.3 hr

C

Update the PCM software
(includes DTC clear).

0.1 hr

D

For AWD - Add

0.4 hr

Defect
Code

A26002B
6V500

QLW00

13021-R70-A11

A26002C

Page 2 of 109

DTC P0304
No Scratching or Scoring Detected
Operation
Number

1115B0

Description

DTC P0304

Flat Rate
Time

Defect
Code

Symptom
Code

Template ID

Failed Part Number

QLW00

A26002D

13021-R70-A11

Symptom
Code

Template ID

Failed Part Number

0.3 hr

Inspect spark plug(s).

A

C

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).
Update the PCM
software (includes
DTC clear).

10.8 hr

6V500

0.1 hr

Scratching or Scoring Detected
Operation
Number

Description

Flat Rate
Time

1115B0

DTC P0304
Inspect spark plug(s).

0.3 hr

B

Repair Procedure B:
Remove cylinder heads,
inspect cylinders, replace
short block and replace
spark plugs 1-4 (includes
idle learn and align).

10.3 hr

C

Update the PCM software
(includes DTC clear).

0.1 hr

D

For AWD - Add

0.4 hr

Defect
Code

A26002E
6V500

QLW00

13021-R70-A11

A26002F

Page 3 of 109

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

Part Number
Cyl 1-3

Cyl 1-4

Cyl. Gasket (Fr)

12251-R70-A01

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
18115-5G0-A01

1

2

Ex. Pipe Gasket

18212-SA7-003

2

2

Head Gasket Fr. (Valve Cover)

12030-R70-A00

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-PLM-A02

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

Bolt, Flange (side mount bolt to frame bracket)

90163-SDA-A01

2

2

Drain Washer 14 mm

1

1

Page 4 of 109

Repair Procedure A - Piston Cleaning and Ring Replacement – cont.